Editorial board:Editor-in-chief:Juozas Žilinskas*** ...... D.D.S., PhD, LUHS (Lithuania)

Scientifi c editor:Ričardas Kubilius***.... D.D.S., Dr. hab. med., prof., LUHS

(Lithuania)Pediatric and Preventive Dentistry:Irena Balčiūnienė*** .... D.D.S., Dr.hab.med, prof., VU

(Lithuania)Oral Surgery and Implantology:Linas Zaleckas** ............M.D., PhD, assoc. prof., VU (Lithuania)

Plastic and Reconstructive Surgery:Andrejs Skagers* ............M.D., Dr.hab.med., prof., RSU (Latvia)

Operative Dentistry:Mare Saag* .................... M.D., PhD, prof. TU (Estonia)

Prosthodontics:Peteris Apse* .................. D.D.S., MSc (Toronto), Dr.hab.med.,

prof., RSU (Latvia)Periodontology:Alina Pūrienė*** ........... D.D.S., PhD, prof., VU (Lithuania)

Orthodontics:Antanas Šidlauskas*** . D.D.S., PhD, prof. LUHS (Lithuania)

Endodontics:Vytautė Pečiulienė*** D.D.S., PhD, prof. VU (Lithuania)

Oral and Maxillofacial Surgery:Edvitar Leibur* ............. DMSc, Prof. Emeritus, TU (Estonia)

Oral Pathology:Ingrida Čema* ............... D.D.S., Dr. hab. med., prof., RSU (Latvia)

Biomedicine:Leonardas Lukoševičius** M.D., Dr.hab.med, prof., LUHS

(Lithuania)

3M ESPE, Medical ProjectsFront page contains a photo of St.Apolonija, the patroness of dentists (statue is located in Vilnius, St.Peter and Povilas Church).Past issues of the journal can be obtained at Kanto str. 4-1, Kaunas. Tel. +370 7 228307, mob. +370 612 71707.

ISSN 1392-8589

Medical journal STOMATOLOGIJABaltic Dental and Maxillofacial Journal

Date of issue 27th September, 2018Quarterly journal

Printed by “Judex spauda”,Europos pr. 122, LT-46351 Kaunas, LithuaniaPrinted on acid-free paper, effective with Volume 5, Issue No. 1, 2003Printrun 250 copies.The instructions to authors in English can be found at http://www.sbdmj.com

Editorial offi ce:I.Kanto str. 4-1, Kaunas, Lithuania, tel./fax. +370 7 228307, mob. +370 612 71707, e-mail: zilinskas@sbdmj.com edoffi ce@sbdmj.comWeb: http://www.sbdmj.com http://www.sbdmj.kmu.ltPublished by:Public Institution “Odontologijos Studija”,Lithuanian Dental Chamber,Latvian Dental Association,Lithuanian University of Health Sciences (LUHS), Faculty of OdontologyVilnius University (VU), Faculty of Medicine, Institute of OdontologyRiga Stradins University (RSU), Institute of StomatologyEstonian Dental AssociationTartu University (TU), Faculty of Stomatology

Editorial Staff:Ilze Akota* ..................... D.D.S., MSc (Oslo), Dr.med., prof.,

RSU (Latvia)Vilma Brukienė*** .........D.D.S, PhD., assoc. prof., VU (Lithuania)Antanas Černikis*** ..... D.D.S., PhD (Lithuania)Harald M. Eriksen*** . D.D.S., PhD., prof., Tromsø (Norway)Alvydas Gleiznys*** ..... D.D.S., PhD, prof., LUHS (Lithuania)Simonas Grybauskas***D.D.S., PhD., VU (Lithuania)Triin Jagomägi*............. D.D.S., PhD, assoc. prof., TU (Estonia)Gintaras Janužis***...... D.D.S., PhD, LUHS (Lithuania)Juozas Jonaitis*** ..........D.D.S., PhD, assoc. prof., LUHS (Lithuania)Gintaras Juodžbalys***D.D.S., PhD, prof., LUHS (Lithuania)Nijolė Kelbauskienė*** . D.D.S., PhD, assoc. prof. (Lithuania)Giedrė Kobs*** ............. D.D.S., PhD, VU (Lithuania)Rita Kundzina* .............. D.D.S., PhD, assoc. prof., Tromsø

(Norway)Niklaus P. Lang .............. D.D.S., Dr.med.dent., MSc (Ann Arbor,

USA), prof., Bern University (Switzerland)Tomas Linkevičius*** .. D.D.S., PhD, assoc. prof., VU (Lithuania)Vita Mačiulskienė*** .... D.D.S., PhD, prof., LUHS (Lithuania)Simona Milčiuvienė*** . D.D.S., PhD, prof., LUHS (Lithuania)Stephen J. Moss*** ....... Prof. Emeritus, D.D.S., M.S.Dr.h.c.,

University of NewYork (USA)Heikki Murtomaa .......... D.D.S., Prof., MPH, University of

Helsinki (Finland)Julija Narbutaitė*** ........D.D.S., PhD, assoc. prof, LUHS (Lithuania)Rita Nommela* .............. M.D., PhD, assoc. prof., TU (Estonia)Violeta Norkūnaitė*** .. D.D.S., PhD (Lithuania)Juozas Olekas*** .......... M.D., PhD, assoc. prof., VU (Lithuania)Pajauta Paipalienė*** ... D.D.S., PhD, assoc. prof. (Lithuania)Edmundas Ratkus*** ... D.D.S. (Lithuania)Jūratė Rimkuvienė*** .. M.D.S., PhD., VU (Lithuania)Madeleine Rohlin*** .... D.D.S., PhD., prof., Malmo (Sweden)Vygandas Rutkūnas*** D.D.S, PhD., assoc. prof., VU, (Lithuania)Žana Sakalauskienė*** D.D.S., PhD, LUHS (Lithuania)Olev Salum* ................... M.D., PhD, assoc. prof., TU (Estonia) Tavo Seedre* .................. M.D., PhD, assoc. prof., TU (Estonia)Alvydas Šeikus *** ........ D.D.S., Lithuanian Dental Chamber

(Lithuania)Algimantas Šurna***.... D.D.S., PhD, prof. (Lithuania)Anastazija Tutkuvienė***D.D.S., PhD, assoc. prof., (Lithuania)Ilga Urtane* ................... D.D.S., PhD, prof, RSU (Latvia)Valdas Vilkinis* ............. D.D.S., PhD (Lithuania)Ulle Voog-Oras* ............. D.D.S., Lic.Med., PhD, assoc. prof., TU

(Estonia) Gediminas Žekonis*** D.D.S., PhD, assoc. prof., LUHS (Lithuania)Jonas Žekonis*** ............ D.D.S., Dr. hab. med., prof., LUHS

(Lithuania)Guntis Žigurs*............. .. D.D.S., PhD, assoc. prof., Iur. (Latvia)* Dentistry ** Biomedicine *** Odontology

Sponsors:

Stomatologija – Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3

Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3 i

TABLE OF CONTENTS

iii Welcome iv Organizers vi Acknowledgement viii General Information xi Final Program xv Congress Abstracts xxviii Author Index xxix Floor plan xxx Vilnius map xxxi Notes 65 SCIENTIFIC ARTICLES

66 Aaa Bbb

TABLE OF CONTENTS The 10th Congress of the Baltic Orthodontic Association 4-7 October, 2018 | Vilnius, Lithuania

ii Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3

Dear friends and colleagues,

It is a great honour and pleasure for me to welcome you to The 10th Congress of the Baltic Orthodontic Association in Vilnius, Lithuania.

Baltic Orthodontic Association was established in 1998 and since then it has been holding meetings in one of the three Baltic States. This year’s meeting manifests the growth of Association with many remarkable international fi gures in orthodontics convening to speak at our congress. The main topic – skeletal Anchorage – shares relevance for orthodontists, oral surgeons and all dentists involved in the multidisciplinary treatment.

The meeting will bring together the best speakers and also provide an opportunity for young scientists and orthodontists to participate in short lectures and poster presentations. We expect this Congress to offer a wonderful recharge and a unique learning opportunity to everyone. We are looking forward to meeting you at the scientifi c sessions and during the social events. An exhibition of a wide range of orthodontic and dental products will be running simultaneously for the entire duration of the Congress.

Vilnius is the medieval capital of Lithuania and is known for the architecture of its Old Town, declared a UNESCO World Heritage Site. In 2018 three Baltic States (Estonia, Latvia and Lithuania) celebrate the centenary of the restoration of their independence. The centenary year gives opportunities to deepen the past of Estonia, Latvia and Lithuania, to experience the celebration together, and to shed a light on the Baltic States’ anticipated future success.

The Organizing Committee will do its best to make this anniversary Congress a memorable event. We hope the discoveries of this hospitable fast growing city will grant fond memories of your stay in Vilnius.

Arūnas VasiliauskasChairman of the Congress

WELCOME

Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3 iii

ORGANIZERS

SCIENTIFIC COMMITTEE

Antanas Šidlauskas D.D.S., PhD, prof. LSMU (Lithuania)Dalia Smailienė D.D.S., PhD, prof. LSMU (Lithuania)Kristina Lopatienė D.D.S., PhD, prof. LSMU (Lithuania)Simonas Grybauskas D.D.S., M.D., PhD, LSMU (Lithuania)Ilga Urtane D.D.S., PhD, prof. RSU (Latvia)Gundega Jakobsone D.D.S., PhD, assoc. prof. RSU (Latvia)Triin Jagomägi D.D.S., PhD, assoc. prof. TU (Estonia)

ORGANIZING COMMITTEE

Dalia Latkauskienė D.D.S., PhD, (Lithuania)Mantas Šidlauskas D.D.S., PhD, LSMU (Lithuania)Arūnas Vasiliauskas D.D.S., PhD, assoc. prof. LSMU (Lithuania)

CO-ORGANIZER

CONGRESS SECRETARIAT

BOA 2018 Congress SecretariatTelephone: +37068248182E-mail: info@boa2018.com

ORGANIZERS

iv Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3

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ACKNOWLEDGEMENT

The Organizing Committee of the 10th Congress of the Baltic Orthodontic Associationis grateful for the contribution to:

GOLD PARTNERS

BRONZE PARTNERS

EXHIBITORS

OTHER PARTNERS

SCIENTIFIC PARTNERS

ACKNOWLEDGEMENT

vi Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3

GENERAL INFORMATION

Congress days

October 4-7, 2018

Congress venue

Crowne Plaza Vilnius HotelAddress: M. K. Ciurlionio St. 84LT03100 Vilnius, Lithuaniahttp://www.cpvilnius.com/

Offi cial language and translation

Offi cial language is English. No simultaneous translation will be provided.

Badges

Upon registration, participants will receive badges with their names. The badge is an entrance ticket for all the congress sessions and is valid either for 2, 3 or 4 days, according to your purchased registration package, so you are kindly requested to wear it and bring it to the congress venue every day.

Registration and hospitality desks

The registration and hospitality desks for the Congress are located on the 1st fl oor of the hotel (see the map at the end of this program booklet). The opening hours for registration and hospitality desks are 07:30 until the end of congress sessions.

Coffee breaks and lunches

Coffee, tea and other refreshments will be served in the Lobby near the main Congress hall and in the exhibition area. Lunch will be served at the hotel restaurant.

Accreditation

The 10th Congress of the Baltic Orthodontic Association will be accredited by the European Accreditation Council for Continuing Medical Education (EACCME) and the Lithuanian Dental Chamber. Each medical specialist should claim only those hours or credits that he/she actually spent in the educational activity.

GENERAL INFORMATION

viii Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3

GENERAL INFORMATION

Certifi cate of attendance

Certifi cates of attendance will be distributed on October 7, after the sessions. For those, attending 2 or 3 Congress days, certifi cates will be presented on the fi nal day of their participation. Before receiving certifi cates, delegates will be kindly requested to hand in the fi lled evaluation forms.

Abstract book

All abstracts that have been accepted by the Scientifi c Committee were published in the scientifi c journal “Stomatologija. Baltic Dental and Maxillofacial Journal”. Companies and delegates may copy materials for their personal use, but further copying for sale or for any other commercial purpose is prohibited without prior written permission of the Editor.

Internet availability

Wifi will be available for all Congress participants at the Congress venue. The log in information and codes will be provided on site.

Photography rules

All kinds of photography and video recording are strongly prohibited during all scientifi c sessions. Photography is allowed during introductory and social speeches, breaks and all times except the lectures.Transgressors of photography regulations will be dismissed from scientifi c session and requested to demonstrate the deletion of all photos from the camera card. In case of repetitive violation of this rule Congress organizers have the right to cancel the Certifi cate of Attendance without refund.

Exhibition

Exhibition that will form an integrated part of the Congress will take place in the Lobby area and Coral halls (see the map at the end of this program booklet). Exhibition will be open during the entire Congress.

Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3 ix

www.forestadent.com

CONGRESS PROGRAM

CONGRESS PROGRAM

October 407:30-08:30 Registration08:30-09:00 Opening

Session I Free Papers09:00-09:30 Dalia Smailienė (Lithuania)

Evidence based assesment of maxillary impacted canine’s treatment methods

09:30-09:50 Irma Dumbrytė (Lithuania)What enamel microcracks characteristics lead to greater risk of tooth damage during orthodontic debonding?

09:50-10:05 Van Thai Nguyen (Estonia)Cephalometric evaluation of pharyngeal airway dimensions and hyoid bone position in children with a oral clefts

10:05-10:20 Mantas Šidlauskas (Lithuania)Heritability of mandibular cephalometric variables in twins with completed craniofacial growth

10:20-10:30 Discussion10:30-11:00 Coffee Break

Keynote Session11:00-13:00 Session II Hugo De Clerck (Belgium)

Bone anchored class III orthopedics and upper arch distalisation in class II malocclusion (Part I)

13:00-14:30 Lunch14:30-16:00 Session III Hugo De Clerck (Belgium)

Bone anchored class III orthopedics and upper arch distalisation in class II malocclusion (Part II)

16:00-16:30 Coffee Break16:30-17:30 Session IV Hugo De Clerck (Belgium)

Bone anchored class III orthopedics and upper arch distalisation in class II malocclusion (Part III)

17:30-18:00 Discussion18:00 Welcome Cocktail (Congress venue, Lobby)18:00 Networking event “Walk-n-Bite” tour (Pick up at 17:40 from hotel reception)October 507:30-08:30 Registration

Session I Free Papers08:30-09:00 Arūnas Vasiliauskas, Laura Linkevičienė (Lithuania)

Importance and challenges of multidisciplinary cleft patients care

09:00-09:15 Jevgenija Podcernina (Latvia)Condylar structural and positional changes in orthognathic surgery patients- a three dimensional analysis

Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3 xi

09:15-09:30 Giedrė Trakinienė (Lithuania)The Impact of genetics and environmental factors on the position of the upper and lower third molars

09:30-09:45 Aistė Kavaliauskienė (Lithuania)Associations between malocclusion and oral health-related quality of life among Lithuanian adolescents

09:45-10:15 Eglė Zasčiurinskienė (Lithuania)Orthodontic treatment in subjects with periodontal disease: benefi ts and risks

10:15-10:30 Discussion10:30-11:00 Coffee Break

Keynote Session11:00-13:00 Session II Heinz Winsauer (Austria)

Expanding the limits. Bone-borne expansion of maxilla (Part I)13:00-14:30 Lunch14:30-16:00 Session III Heinz Winsauer (Austria)

Expanding the limits. Bone-borne expansion of maxilla (Part II)16:00-16:30 Coffee Break16:30-17:30 Session IV Heinz Winsauer (Austria)

Expanding the limits. Bone-borne expansion of maxilla (Part III)17:30-18:00 Discussion19:00 BOA Anniversary Evening (Arkangelo conference and art center (Maironio

str. 11, Vilnius). Transportation will be arranged at 18:30 from Congress venue.)October 607:30-08:30 Registration

Session I Free Papers08:30-09:00 Kristina Lopatienė (Lithuania)

Breathing pattern and dentofacial development09:00-09:30 Triin Jagomägi (Estonia)

Team care of orofacial functional disorders09:30-10:00 Aušra Znamenskaitė Levickienė (Lithuania)

Mucogingival surgery before and after orthodontic treatment10:00-10:15 Asta Abunevičiūtė (Lithuania)

When straight wire is not enough? When to use segmented arch biomechanics and why?

10:15-10:30 Discussion10:30-11:00 Coffee Break

Keynote Session11:00-13:00 Session II Kee-Joon Lee (South Korea)

Contemporary total arch mechanics for non-surgical, non-ex-traction and non-prosthetic treatment using miniscrews (Part I)

13:00-14:30 Lunch

CONGRESS PROGRAM

xii Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3

14:30-16:00 Session III Kee-Joon Lee (South Korea)Contemporary total arch mechanics for non-surgical, non-ex-traction and non-prosthetic treatment using miniscrews (Part II)

16:00-16:30 Farewell Coffee Break16:30-17:30 Session IV Kee-Joon Lee (South Korea)

Contemporary total arch mechanics for non-surgical, non-ex-traction and non-prosthetic treatment using miniscrews (Part III)

17:30-18:00 DiscussionOctober 7s08:00-09:00 Registration

Session I Free Papers09:00-09:15 Natalija Shilova (Latvia)

Facial and dental asymmetry in young adolescents09:15-09:45 Simonas Grybauskas (Lithuania)

Most common mistakes made in orthodontic preparation for surgery. The protocol

09:45-10:15 Dalia Latkauskienė (Lithuania)Most common mistakes made in orthodontic preparation for surgery. The protocol

10:15-10:30 Discussion10:30-11:00 Coffee Break

Keynote Session11:00-13:00 Session II Giorgio Iodice (Italy)

The rationale of skeletal anchorage in orthodontics: new protocols and new therapeutic possibilities (Part I)

13:00-14:30 Lunch14:30-16:00 Session III Giorgio Iodice (Italy)

The rationale of skeletal anchorage in orthodontics: new protocols and new therapeutic possibilities (Part II)

16:00-16:30 Coffee BreakSession IV Free Papers

16:30-17:00 Dalia Latkauskienė (Lithuania)Most common mistakes made in orthodontic preparation for surgery. The protocol

17:00-17:10 Dalia Latkauskienė (Lithuania)Evaluation of the posterior maxillary teeth movements during class ii correction: 3-dimensional superimposition of casts

17:10-17:20 Guostė Basevičiūtė (Lithuania)Healing of gingival recessions during orthodontic treatment

17:20-17:30 Alvyda Andriekutė (Lithuania)Orthodontic problems among string and wind instrument players

17:30-18:00 Discussion

CONGRESS PROGRAM

Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3 xiii

CONGRESS ABSTRACTS

CONGRESS ABSTRACTS

ABSTRACTS OF FREE PAPERS AND KEYNOTE PRESENTATIONSAbstracts are listed according to the Congress program.

October 4 Free papers

EVIDENCE BASED ASSESSMENT OF MAXILLARY IMPACTED CANINES‘ TREATMENT METHODSDalia Smailienė (Lithuanian University of Health Sciences, Kaunas, Lithuania)

Introduction. Maxillary permanent canines are very important teeth from an aesthetic and functional point of view. However, sometimes, for various reasons, these teeth remain impacted. Although maxillary canines impaction is a quite rare pathology in comparison with other orthodontic anoma-lies, but it is given considerable attention, because the treatment of impacted teeth is technically complex and expensive, besides there is a signifi cant risk of adjacent tooth damage. The purpose of presentation- is to discuss the treatment possibilities for the impacted permanent maxillary ca-nines, based on the evidence from recent year’s research.Materials. Database search of literature was performed.Results. Interceptive procedures for the treatment of impacted canines are effective, but preferably in children aged 10-11 years. Impacted canines treated with surgical-orthodontic treatment show clinically acceptable periodontal condition. According to existing evidence there is no difference between open and closed surgical exposure techniques regarding the periodontal outcomes and aesthetic appearance. The major reasons for failure in the treatment of impacted canines are in-adequate anchorage, inaccurate diagnosis and ankylosis.Conclusions. Improving diagnostic methods and new research data make it possible to choose the right treatment tactic.

WHAT ENAMEL MICROCRACKS CHARACTERISTICS LEAD TO GREATER RISK OF TOOTH DAMAGE DURING ORTHODONTIC DEBONDING?Irma Dumbryte (Vilnius Research Group; Institute of Odontology, Vilnius University, Vilnius, Lithu-ania) Laura Linkeviciene (Institute of Odontology, Vilnius University, Vilnius, Lithuania)Tomas Linkevicius (Vilnius Research Group; Institute of Odontology, Vilnius University, Vilnius, Lithuania)Mangirdas Malinauskas (Laser Research Center, Vilnius University, Vilnius, Lithuania)

Introduction. Due to the forces generated during debonding enamel microcracks (EMCs), a form of teeth damage, may develop and appear morphological changes of their characteristics. However, lit-tle is known about the role of EMCs itself to the development of greater extent enamel surface defects during brackets removal. Aim: to evaluate the effect of qualitative and quantitative EMCs characteristics (severity, direction, location, and length) on the tooth damage during debonding. Materials. Measurements of the detailed EMCs parameters were obtained from the consolidated images (stitching of high resolution scanning electron microscopy micrographs) of the buccal tooth surface and our derived formulas (x=h/30, l=n*x) before and after metal and ceramic brackets re-moval.Results. The likelihood of having greater extent enamel defects (presented as odds ratios) was higher for the teeth with pronounced EMCs (visible by the naked eye), increased when EMC was located in more than one zone of the tooth, and possessed specifi c inclination on the buccal tooth surface. Conclusions. Only visibility of EMCs before bonding is of low prognostic value for predicting EMCs

Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3 xv

CONGRESS ABSTRACTS

increase during brackets removal. However, EMC showing all these specifi ed characteristics at the beginning of the orthodontic treatment might predispose to higher risk of greater extent tooth surface damage during debonding by >20%.

CEPHALOMETRIC EVALUATION OF PHARYNGEAL AIRWAY DIMENSIONS AND HYOID BONE POSITION IN CHILDREN WITH ORAL CLEFTSVan Thai Nguyen (Institute of Dentistry, University of Tartu, Tartu, Estonia)Triin Jagomägi (Institute of Dentistry, University of Tartu, Tartu, Estonia)

Introduction. Patients with oral clefts have changes in the anatomy of the nasal and oral region, along with altered oral and pharyngeal muscles. The study aimed to compare the pharyngeal airway linear dimensions and positions of the hyoid bone between cleft types on lateral cephalograms.Materials. Lateral cephalograms of 37 children with oral clefts which were cleft lip and palate (CLP) and cleft palate (CP) aged from 6 to 12 years were selected. The age- and gender-matched controls were noncleft children with no history of sleep-disordered breathing treatment. Six linear distances of the pharyngeal airway and four position measurements of the hyoid bones were measured.Results. There were no signifi cant differences in the pharyngeal airway dimensions between children with CLP and the controls. The superior border of nasopharynx was signifi cantly different between children with CLP and children with CP. The inferior border of nasopharynx was signifi cantly different between children with CP and the controls. No differences in the hyoid bone position were found among the groups.Conclusion. The study found no differences in the pharyngeal airway between the cleft and control group except in nasopharyngeal airway. The hyoid bone position had no differences among the groups.

HERITABILITY OF MANDIBULAR CEPHALOMETRIC VARIABLES IN TWINS WITH COMPLETED CRANIOFACIAL GROWTHMantas Šidlauskas (Lithuanian University of Health Sciences, Kaunas, Lithuania)

Introduction. To determine genetic and environmental impact on mandibular morphology using lateral cephalometric analysis of twins with completed mandibular growth and DNA based zygosity determination.Materials. The 39 cephalometric variables of 141 same sex adult pair of twins were analysed. Zy-gosity was determined using 15 specifi c DNA markers and cervical vertebral maturation method was used to assess completion of the mandibular growth. A genetic analysis was performed using maximum likelihood genetic structural equation modelling (GSEM).Results. The heritability estimates of angular variables describing horizontal mandibular position in relationship to cranial base and maxilla were considerably higher than in those describing vertical position. The mandibular skeletal cephalometric variables also showed high heritability estimates with angular measurements being considerably higher than linear ones. Results of this study indicate that the angular measurements representing mandibular skeletal morphology (mandibular form) have greater genetic determination than the linear measurements (mandibular size).Conclusions. The shape and sagittal position of the mandible is under stronger genetic control, than is its size and vertical relationship to cranial base.

Keynote presentation

BONE ANCHORED CLASS III ORTHOPEDICS AND UPPER ARCH DISTALISATION IN CLASS II MALOCCLUSIONHugo De Clerck (Private practice, Brussels, Belgium)

Miniplates resist better high discontinuous forces than miniscrews do. Therefore they can be used for intermaxillary orthopedic traction. Class III elastics can be fixed between Bollard

xvi Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3

anchors on the buttress of the maxilla and in the canine region of the mandible in young grow-ing patients. Which biomechanical approach should be used, which loading protocol? What is the best timing? Can the growth of the maxilla and/or mandible be stimulated, restricted or redirected? Is the outcome predictable? Is this protocol an alternative for orthognathic surgery after growth? The results of this continuous bone anchored traction will be discussed based on Cone-beam CTs at T1 and T2 registered on the anterior cranial base, also in cleft patients. The outcome will be compared with a control group and face mask orthopedics with or without RPE. Successful class III orthopedics often result in the creation of a class II malocclusion. Since the upper miniplates are fixed at a distance from the dental arch, they can also be used to distalise the complete upper arch. This can be done by simultaneous ‘en masse’ retraction of small or large groups of teeth. For optimal efficiency, good control of the vertical dimension is needed.

October 5Free papers

IMPORTANCE AND CHALLENGES OF MULTIDISCIPLINARY CLEFT PATIENTS CAREArunas Vasiliauskas (Lithuanian University of Health Sciences, Kaunas, Lithuania) Laura Linkeviciene (Vilnius University, Faculty of Medicine, Vilnius, Lithuania)Linas Zaleckas (Vilnius University, Faculty of Medicine, Vilnius, Lithuania)Asta Lipnickiene (Vilnius University, Zalgirio Hospital, Vilnius, Lithuania)

Introduction. The aim of the research was to evaluate the opinion of parents and knowledge of health care professionals (HCP) about early cleft care in Lithuania.Materials. Parents of children under age of 3 years born with the cleft fi lled in questionnaires to evaluate how HCP care for cleft child and how much information and support they provide for par-ents. HCP fi lled in questionnaires about diagnosis, etiology and treatment protocols.Results. Parents reported need of specialists who may give advices on fi rst days after birth for the family. Parents asserted on the lack of empathy and understanding from HCP, emphasizing the adversity for treatment access for countryside residents. Many psychological and social diffi culties were also mentioned – long treatment duration, discrimination, bullying, aesthetical problems, lack of support from relatives. HCP were bound to mention feeding problems, but the majority could not distinguish how different types of cleft affect feeding. Most HCP noted breastfeeding specialists and nurses as the professionals who teach of baby feeding. All HCP advocated for inclusion of feeding, social and psychological help for early cleft care.Conclusions. Parents want to have more information about feeding and future treatment plan while specialists acknowledge necessity for more information in handling situations with cleft newborns.

CONDYLAR STRUCTURAL AND POSITIONAL CHANGES IN ORTHOGNATHIC SURGERY PATIENTS - A THREE-DIMENSIONAL ANALYSISJevgenija Podchernina (Riga Stradins University, Riga, Latvia)Ilga Urtane (Riga Stradins University, Riga, Latvia)

Introduction. To investigate long-term (4 years) effects of orthognathic surgery on temporoman-dibular joints.Materials. Forty-four patients (14 males and 30 females) responded to a long-term recall (4.4 ± 0.8 years) after orthognathic surgery. The mean age of the patients at surgery was 22.1 ± 2.8 years. Eleven patients had had surgery to correct Class II and 33 patients – skeletal Class III. Isolated osteotomies were done in 36.4 % and bimaxillary surgery was performed in 63,6 % of cases. The patients were assessed clinically; structural and positional changes of the condyles

CONGRESS ABSTRACTS

Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3 xvii

were assessed on cone beam computed tomography. Three-dimensional models of the condyles were constructed for evaluation of condylar remodeling by the means of color-coded maps. Results. The total score for condylar bony changes statistically signifi cantly (p=0.000) increased for both sides; no association with clinical symptomswas found. Four years post-surgery the condyles were at the same position within the glenoid fossa as before surgery. Condylar remodeling was recorded at the long-term inspection, however, the median amount of remodeling did not exceed 1.2 mm in either of the zones of interest. Conclusions. In general, orthognathic surgery does not induce clinically signifi cant changes in temporomandibular joint.

THE IMPACT OF GENETICS AND ENVIRONMENTAL FACTORS ON THE POSITION OF THE UPPER AND LOWER THIRD MOLARSGiedrė Trakinienė (Lithuanian University of Health Sciences, Kaunas, Lithuania)Antanas Šidlauskas (Lithuanian University of Health Sciences, Kaunas, Lithuania) Vilma Švalkauskienė (Lithuanian University of Health Sciences, Kaunas, Lithuania)Dalia Smailienė (Lithuanian University of Health Sciences, Kaunas, Lithuania)Arūnas Vasiliauskas (Lithuanian University of Health Sciences, Kaunas, Lithuania)Kristina Lopatienė (Lithuanian University of Health Sciences, Kaunas, Lithuania)Tomas Trakinis (Republican Hospital, Kaunas, Lithuania)

Introduction. The purpose of this study was to estimate the importance of heredity in the position of the upper and lower third molars.Materials. Panoramic radiographs and lateral cephalograms of same-sex twins with CVM 5-6 were analyzed for third, second, fi rst molar sizes, angulations and eruption levels. The determination of zygosity was performed by means of DNA test. Data were estimated by the relative infl uence of additive genetic factors (A), non-additive genetic factors (D), the common or shared environment (C), and unique environmental factors (E).Results.The study sample consisted of 212 twins: 80 dizygotic and 132 monozygotic twins. The genetic analysis showed that the best fi tting model for the size of the molars and their angulations was AE, where the additive genetic factors had up to 84% of infl uence for upper and up to 88 % of infl uence for lower third molars. The specifi c environment contributed up to 40% for upper third molars and up to 27% for the lower third molars. Therefore, the ACE model showed higher signifi -cance for the upper and lower third molars eruption level.Conclusions. Genetic factors play a key role in the position of the upper and lower third molars.

ASSOCIATIONS BETWEEN MALOCCLUSION AND ORAL HEALTH-RELATED QUALITY OF LIFE AMONG LITHUANIAN ADOLESCENTSAistė Kavaliauskienė (Lithuanian University of Health Sciences, Kaunas, Lithuania)Antanas Šidlauskas (Lithuanian University of Health Sciences, Kaunas, Lithuania)

Introduction. The aim was to examine the associations between malocclusion and oral health-related quality of life (OHRQoL) among Lithuanian adolescents aged 11–18.Materials. A representative cross-sectional study of 911 adolescents aged 11-18 was conducted in 26 public schools. Schoolchildren completed Child Perceptions Questionnaire (CPQ) to evalu-ate their OHRQoL. Index of Orthodontic Treatment Need (IOTN) was used to assess the severity of malocclusion. The strength of association between IOTN and CPQ scores was evaluated via negative binomial regression estimating the ratio of sum score means (RSSM).Results. A worse OHRQoL score was associated with a higher grade of IOTN. However, only the emotional and social well-being domains were signifi cantly affected by malocclusion (RSSM = 1.158; 95% CI: 1.083–1.237 and RSSM = 1.205; 95% CI: 1.114–1.304, respectively). The effect of malocclusion on OHRQoL was greater among females (RSSM = 1.264; 95% CI: 1.176–1.359). A

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signifi cant association was observed in all age groups for emotional and social well-being domains, but only in the oldest age group for oral symptoms and functional limitations domains.Conclusions. Malocclusion has a negative impact on OHRQoL of young people with emotional and social aspects being the most affected. Girls and older adolescents suffer from malocclusion more severely.

ORTHODONTIC TREATMENT IN SUBJECTS WITH PERIODONTAL DISEASE: BENEFITS AND RISKSEglė Zasčiurinskienė (Lithuanian University of Health Sciences, Kaunas, Lithuania)

Introduction. The aim was to analyse the benefi ts and risks of periodontal-orthodontic treatment on periodontal tissues in subjects with periodontal disease (PD).Materials. 50 subjects with PD were randomly assigned either to test (PT simultaneous with OT) or control group (PT before the start of OT). Initial treatment included oral hygiene instruction and sub-gingival debridement. Nonsurgical and subsequent surgical PT was performed at different time points in the groups. All patients were examined by CBCT before and after OT to explore the extent of external apical root resorption (EARR) and changes in alveolar bone levels (ABL).Results. No difference in CAL change, EARR and ABL was found whether OT was performed simul-taneously with or after PT. Median CAL change (sites CAL ≥4 mm) was 0.4 mm (IQR: 0.19, 0.61). CAL gain was observed in mean of 1/4 of the sites. ABL improved on mean of 15.6% (SD 7.4) and decreased on mean of 15.1% (SD 7.5) of surfaces. EARR was found in median of 80.7% (IQR: 68.0, 90.0) of single-rooted teeth with mean EARR of 1.2 mm (SD 0.44) (EARR <2 mm in 82%).Conclusions. Orthodontic treatment under optimal conditions could be included earlier in the reha-bilitation of patients with PD.

Keynote presentation

EXPANDING THE LIMITS. BONE-BORNE EXPANSION OF MAXILLAHeinz Winsauer (University of Graz, Graz, Austria)

A great smile is the most common desire expressed by most patients before orthodontic treatment. But the underlying anatomical structures do not always allow this. There are possibilities but also limits within the alveolar envelope for dental expansion. Beyond these limits relapse and periodontal damage might be expected. Widening the skeletal base leads to simplifi ed and accelerated dental treatment with stable results and a pleasing appearance. Pure bone borne miniature expanders anchored on orthodontic mini-implants allow maxillary expansion without dental side effects or the need for surgical assistance even in mature adults.

October 6Free papers

BREATHING PATTERN AND DENTOFACIAL DEVELOPMENTKristina Lopatienė (Lithuanian University of Health Sciences, Kaunas, Lithuania)

Introduction. The development of malocclusion is considered to be a result of the interactions among genetics and number of external and internal environmental factors, including breathing pattern. Prolonged mouth breathing is associated with dentofacial malocclusions, impaired speech, abnormal posture, and even cardiovascular, respiratory and endocrine dysfunctions. The recent years have been marked by renewed interest in the search for interrelationships between respiratory function

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and growth and development of craniofacial complex. The aim of the study was to evaluate rela-tionships between malocclusion characteristics and breathing pattern.Materials. After evaluation of clinical and radiological data, 120 pre-orthodontic patients were randomly selected for the study. Cephalometric analysis was performed using Dolphin Imaging software, hard and soft tissue, and upper airway analysis was done.Results. Cephalometric analysis applied in the study showed, that Angle II subjects with signifi cantly decreased facial convexity angle, increased nasomental, upper lip-chin, and the lips located more proximally to the E line more frequently had constricted airways.Conclusions. During critical period of growth and development of the maxillofacial system the pa-tients with nasal obstruction must be monitored and treated by a multidisciplinary team. Therefore normal function of the airway is of the considerable importance in orthodontics and cannot be overlooked in treatment planning.

TEAM CARE OF OROFACIAL FUNCTIONAL DISORDERSTriin Jagomägi (University of Tartu, Tartu, Estonia)

Introduction. Oromyofunctional disorders (OMD) may stand alone, or be the symptom of another underlying disorder, and they can co-occur with a variety of other physical, craniofacial, and neu-rodevelopmental disorders.Materials. Unimed United Clinics have had a team approach to OMD treatment already more than 5 years. In our team, all dental professionals have represented, but in addition, we have an oppor-tunity to cooperate with a sleep specialist and sleep laboratory. Tartu University started teaching the OMD related course systematically 3 years ago. The main idea of the course is to integrate students from different professions and offer to the model of team care approach.Results. An overview of a team approach in Estonia and our clinical practice and research work are discussed in the presentation.Conclusions. Many people spend years treating the symptoms, like distorted articulation or tongue thrust, with minimal progress. A thorough differential diagnosis, a prioritized multidisciplinary treat-ment plan, and individualized care can help produce more effective outcomes. All medical specialists should be educated to see distorted oral functions at an early age. Early treatment is more cost-effective, has better results and helps to prevent many medical issues that may occur late in life.

MUCOGINGIVAL SURGERY BEFORE AND AFTER ORTHODONTIC TREATMENTAušra Znamenskaitė Levickienė (Private practice, Kaunas, Lithuania)

Introduction. By means of orthodontics, it is possible to correct teeth position and to improve soft tissue esthetics. However, during orthodontic treatment (OTM) some adverse effects on the soft periodontal tissue may be observed. Materials. An electronic database search was carried out using PubMed abstract and citation database. Soft periodontal tissues changes during OTM and mucogingival surgery techniques are discussed in the presentation.Results. Short clinical crowns or asymmetrical gingival contour can be observed before OTM. If there is indication for esthetic crown lengthening (ECL) before OTM, there will most likely still be the need for ECL after OTM. During or after OTM, gingival overgrowth might be observed and to correct this condition surgical procedure might be needed. Among orthodontic patients, up to 10–12% exhibited gingival recessions (GR) (Renkema et al 2013). GR can be treated with mucogingival surgery. However, in some cases soft tissue augmentation before OTM should also be considered.Conclusions. Reliable ECL and soft tissue augmentation techniques are described in the literature. While the timing of ECL is clear, the present data do not allow to draw conclusions on the best tim-ing for soft tissue augmentation. Further randomized clinical studies are needed.

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WHEN STRAIGHT WIRE IS NOT ENOUGH. WHEN TO USE SEGMENTED ARCH BIOMECHANICS AND WHY?Asta Abunevičiūtė (Private practice, Vilnius, Lithuania)

Introduction. Over the last few years new materials, treatment techniques and trends have over-shadowed the main principles of why and how teeth move. In search of the magic bracket and the smartest wire sequence, clinicians have neglected the basics of orthodontics. Tempting as it may be to for us to shut down our minds and leave ourselves and our patients in the hands of the marketing expert who tells the best story, we must remember that the laws of physics have not changed. The aim of this presentation is to recall that correct biomechanical design empowers us to solve challenging cases. Materials. Whether using a straight wire technique or a segmented technique, conventional or lin-gual brackets, removable appliances or aligners, the physics and the mechanics work by the same principles. The teeth are moved by the forces and moments rather than the brackets and wires. The latter are merely the tools to deliver those forces and moments.Results. Applying simple knowledge of biomechanics in everyday practice enables a practitioner to foresee and overcome the shortcomings of a straight wire technique by simply segmenting it at the right places.Conclusion. Good knowledge of orthodontic biomechanics allows us to plan and treat cases with more precision.

Keynote presentation

CONTEMPORARY TOTAL ARCH MECHANICS FOR NON-SURGICAL, NON-EXTRACTION AND NON-PROSTHETIC TREATMENT USING MINISCREWSKee-Joon Lee (Yonsei University, Seoul, South Korea)

“Biomechanics” may sound pedantic unless it is viably incorporated into the clinical situation. Con-ventional biomechanical principles revealed that on a continuous archwire, one unit signifi cantly affects the other when the two units are tied against each other, which greatly limits the treatment options for the orthodontist to choose from. For example, in premolar extraction cases, translation or root movement of anterior segment inevitably causes signifi cant forward movement of posterior segment. From our past experiences and researches it has been shown that the miniscrew-type TADs enables arbitrary tooth movement in three-dimensional space depending on the force system designed by the orthodontist. Then the next question “How would we apply those rules to clinical situation?” may arise.

October 7Free papers

FACIAL AND OCCLUSAL ASYMMETRYNatalija Shilova (Riga Stradins University, Riga, Latvia)Alla Belaka (Riga Stradins University, Riga, Latvia)Signe Silinevica (Riga Stradins University, Riga, Latvia)Gundega Jakobsone (Riga Stradins University, Riga, Latvia)

Introduction. The aim was to assess occlusal and facial asymmetry. Materials. The sample (61 males, 50 females) was retrieved from the growth study ongoing at the Riga Stradins University. The faces were captured using 3dMD face scanner and occlusion was

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assessed on intraoral scans. The median age was: 15.9 (15.2 – 16.3) years. Image processing was performed using a set of in-house developed subroutines. Results. Class I was recorded in 48 cases, Class II in 9 cases and Class III in 7 cases. 28 indivi-duals had unilateral Class II and 17 - unilateral Class III. Males had longer faces and were more asymmetrical in the traversal plane. The amount of three-dimensional (3D) symmetry for the whole face was 60 %. The 3D symmetry for the eyes to lips region was 62%, while for the chin region- 41%. None of the symmetry measurements was affected by the sagittal relationships of dentition. Crossbite was associated with increased two-dimensional (2D) NPrPg angle and 3D ExRExL/ChLChR angle. The deviation of the the lower midline correlated with the deviation of lower lip (r= 0.298, p=0.022, superior lip (r=0.258, p=0.047) and chin (r=0.298, p=0.023). Conclusion. Asymmetric occlusion was not associated with facial asymmetry.

MOST COMMON MISTAKES MADE IN ORTHODONTIC PREPARATION FOR SURGERY. THE PROTOCOLSimonas Grybauskas, Dalia Latkauskiene (Lithuania)

Correction of skeletal malocclusion by means of orthodontics and orthognathic surgery is a multi-disciplinary treatment. That is why it has to be properly coordinated between the surgeon and the orthodontist. The best results are achieved when both players are active in team and communicate throughout the treatment.It is important to understand that the orthodontist works at the dentoalveolar level whereas the sur-geon works at the skeletal level and does not interfere into the teeth setup during the surgery. That is why the teeth should be setup properly within the jaw bones and allow the anticipated repositioning of jaw bones in the necessary vectors and distance. If not, the surgeon may be cornered during planning process and will have to alter it both incurring hesitations whether the surgical outcome is going to be the same as planned.We are going to discuss the most usual mistakes in orthodontic setup for surgery: dental midlines non-coincident with skeletal midlines, inadequate angulation of front teeth, overzealous expan-sion or constriction, fl aws created by improper closure of extraction spaces, unstable orthodontic mechanics resulting in postoperative orthodontic relapse. Intrinsic coordination of upper and lower dental arch shapes and extrinsic coordination of dental arches to the skeletal bases of the jaws set the protocol of our work: stable orthodontic alignment, minding the midlines and angulation of teeth while aiming to achieve maximal decompensation within physiological limits. Facial aesthetics largely depends on the surgical plan of jaw repositioning, however, the plan may largely depend on the accuracy and quality of preoperative orthodontic setup.

Keynote presentation

THE RATIONALE OF SKELETAL ANCHORAGE IN ORTHODONTICS: NEW PROTOCOLS AND NEW THERAPEUTIC POSSIBILITIESGiorgio Iodice (University of Naples Federico II, Naples, Italy)

Recognizing the necessary anchorage, knowing how to obtain and maintaining it during the treat-ment are certainly some of the fundamental points that lead to orthodontic success. For years or-thodontists have applied complex systems and various devices to maintain the desired anchorage, sometimes only partially succeeding. Situations of absence of multiple dental elements or cases of compromised tooth support could sometimes make orthodontic treatment extremely complex, if not impossible. The introduction of Temporary Anchorage Devices (TADs), safe devices and simple clinical use, has revolutionized the orthodontic world, simplifying otherwise very complex treatments, and making possible treatments otherwise impossible. During the last fi fteen years,

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the use of TADs has deeply transformed my daily orthodontic practice, leading to new protocols and simplifi ed orthodontic biomechanics. Furthermore, the use of the front portion of the palate for the insertion of TADs has allowed in the last years to overcome or reduce some of main limits of inter-radicular TADs. Indeed, this new approach has allowed exploiting better bone characteristics, quantitatively and qualitatively, eliminating, at the same time, any interference during orthodontic movements. Therefore, the use of skeletal anchorage and especially palatal skeletal anchorage offers to the clinicians new and promising therapeutic opportunities, with the possibility of develop-ing many devices, for the most varied orthodontic objectives.

Free papers

EVALUATION OF THE POSTERIOR MAXILLARY TEETH MOVEMENTS DURING CLASS II CORRECTION: 3-DIMENSIONAL SUPERIMPOSITION OF CASTSDalia Latkauskienė (Private practice, Kaunas, Lithuania)Igal Grybalsky (Private practice, Riga, Latvia)Gundega Jakobsone (Riga Stradins University, Riga, Latvia)

Introduction. The aim of this study was to analyse the changes of the posterior dentition during Class II correction with the crown Herbst appliance (cHerbst) and intermaxillary Class II elastics. Materials. Class II patients were divided into 2 groups: those who were treated with the cHerbst appliance (n = 40, mean age 14.1±1.3) and those who were treated with fi xed appliances and Class II elastics (n = 20, mean age 16.7±2.7). The scans of pre- and post-treatment casts the patients were superimposed and registered using the freeware Blender 2.67. The directional movements in all 3 planes were assessed. Results. In the cHerbst group clinically signifi cant derotation (13.8±5.0°) and distalization (3.2 ± 1.2 mm) of the upper fi rst molars were recorded compared to the intermaxillary Class II elastics group (4.2±5.5°, -0.3±1.5, respectively). In the cHerbst group the second and fi rst premolars followed the distal movements of the upper fi rst molars. The premolars expanded slightly more than the molars in both groups. The posterior teeth extruded in both groups, except the molars in the cHerbst group. Conclusions. The crown Herbst appliance is signifi cantly more effective in molar derotation and distalization than intermaxillary Class II elastics.

HEALING OF GINGIVAL RECESSIONS DURING ORTHODONTIC TREATMENTGuostė Basevičiūtė (Vilnius University, Vilnius, Lithuania)Eglė Zasčiurinskienė (Lithuanian University of Health Sciences, Kaunas, Lithuania) Dalia Smailienė (Lithuanian University of Health Sciences, Kaunas, Lithuania)

Introduction. Literature about changes of gingival recessions (GR) during orthodontic treatment (OT) is scant. The aim of this retrospective study was to examine the change of GR before and after OT.Materials. Intraoral photographs of 993 patients treated with fi xed appliances between 2005 and 2017 were evaluated. Patients, who had ≥1 buccal/labial GR on maxillary/mandibular teeth mesial to fi rst molars were included. GR were measured on good quality plaster models before and after OT.Results. 114 GR were found in 37 patients before OT. Mean GR improvement after OT was 0.51 mm (SD 0.62) (p<0.001). 71 (62.3%) GR improved, 37 (32.4%) did not change, 6 (5.3%) became worse. Of those 71 improved GR, full healing was observed in 15 (21.1%) teeth.Less tendency for healing of GR was observed in cases with pre-treatment open bite (OR 3.3; 95% CI: 1.10; 9.81) (p=0.03) and Class III patients (OR 2.8; 95% CI: 1.14; 6.83) (p=0.03). GR had greater chance for improvement in cases with thick/normal gingival biotype compared with thin biotype (OR 2.4; 95% CI: 1.07; 5.28) (p=0.03).Conclusions. Based on the results of this retrospective study, we conclude that orthodontic treat-ment may improve or even infl uence healing of gingival recessions.

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ORTHODONTIC PROBLEMS AMONG STRING AND WIND INSTRUMENT PLAYERSAlvyda Andriekutė (Lithuanian University of Health Sciences, Kaunas, Lithuania)Viktorija Masiulytė (Lithuanian University of Health Sciences, Kaunas, Lithuania)Vilma Švalkauskienė (Lithuanian University of Health Sciences, Kaunas, Lithuania)

Introduction. Specifi c occlusion problems are caused by playing with wind and string musical instru-ments for a long time. The aim of the work was to establish the orthodontic problems among piano, string and wind instrument players.Materials. The sample of the research included 167 students of musical education institutions in Kaunas city. Participants were divided into three groups: 52 string (violin and viola) students, 46 wind students and 69 piano students as a control group. They were investigated clinically according to the ICON index. The facial profi le was estimated and a questionnaire was given.Results. More than half of the participants had convex facial profi le, 37.7% - straight and only 4.2% – concave. In total 35.3% of participants had a crossbite. 1/3 – 2/3 overlap of the incisors was more frequent in wind instrument players group than in other groups. The average of all participants’ ICON index reached 28.79 ± 15.01 scores: higher values were estimated for violinists and males. Students with crossbite played more hours than without crossbite. A cusp-to-cusp molar relation-ship (4034.7 hours) was observed in players who played more hours.Conclusions. Playing the violin might predispose crossbite and playing wind instruments - deepbite.

POSTER PRESENTATIONSAbstracts are listed alphabetically according to the last name of presenting author.

MINISCREW-ASSISTED MINIMALLY INVASIVE SURGICAL PALATAL EXPANSION BEFORE ORTHOGNATHIC SURGERY FOR LATE ADOLESCENCESVaiva Jakutytė (Institute of Odontology, Faculty of Medicine, Vilnius University, Vilnius, Lithuania)Simonas Grybauskas (Private practice in Simonas Grybauskas' Orthognatic Surgery, Vilnius, Lithuania)

Introduction. Maxillary expansion through midpalatal suture can be clinically unpredictable in late adolescences and young adults. This case report describes the use of miniscrew-assisted rapid palatal expansion (MARPE) with minimally invasive surgery.Materials. Mini-screw assisted minimal invasive palatal expansion was applied to 2 late adolescence patients (17 and 18-year-olds), who had transverse in the frontal maxillary segment and severe anterior-posterior discrepancies. Both of them were treated non surgically with rapid palatal ex-pander (RPE) unsuccessfully before. Adequate space was gained for maxillary arch coordination and followed by orthodontic treatment with a straight-wire appliance before surgical mandibular advancement. Records were analysed before and after the expansion treatment.Results. Mini-screw assisted minimal invasive surgical expansion in the frontal maxillary region was achieved as an increase in inter-canine width (ICW).Conclusions. Miniscrew-assisted orthodontic expansion with minimal invasive surgery can be ap-plied to minimize bimaxillary orthognatic surgery to mandibular advancement for late adolescences in normal angle symmetrical patients.

THE CHANGE OF CRANIOFACIAL PROPORTION INDICES FROM BIRTH TILL 16-YEAR-OLD OF AGE IN LITHUANIAN CHILDRENGreta Margelyte (Vilnius University Zalgiris Clinic, Vilnius, Lithuania)Donata Petronyte (Vilnius University Zalgiris Clinic, Vilnius, Lithuania) Ruta Almonaitienė (Vilnius University Zalgiris Clinic, Vilnius, Lithuania)

Introduction. Previous studies on craniofacial proportions and their change during growth have

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never included newborns. The aim of this study was to evaluate which craniofacial proportions are established early in life and maintained during growth.Materials. Anthropometric data of 172 newborns, 197 four-year-old and 209 sixteen -year-old children were taken from two cross-sectional studies carried out in Vilnius city. 108 craniofacial measurements were used to calculate 54 proportions of head and face and intergroup comparisons according to age and sex were made. The proportion change of less than 5% between age groups was accepted as minimal.Results.No statistically signifi cant difference was found between newborns and 4-year-olds for the n-gn/tr-gn (p = 0.346) and sto-gn/n-sto (p = 0.154) proportions in girls as well as tr-gn/v-gn (p = 0.350, p = 0.380) and t-t/t-sn (p = 0.054, p = 0.076) indexes in both gender groups. The same pro-portions showed less than 5% of change from 4 to 16 years of age.Conclusions. Vertical face proportions are established early in life and are maintained during growth especially for girls as well as the middle face depth/cranial base width index for both genders.

CHANGES IN PALATAL DIMENTION FOLLOWING MINISCREW-ASSISTED RAPID PALATAL EXPANTION IN YOUNG ADULTS: PRESENTATION OF 3 CLINICAL CASESAgnė Rovienė (Institute of Odontology, Faculty of Medicine, Vilnius University, Vilnius, Lithuania) Dovilė Bradulskaitė (Vilnius University Hospital Zalgiris Clinics, Vilnius, Lithuania)Rūta Almonaitienė (Institute of Odontology, Faculty of Medicine, Vilnius University, Vilnius, Lithuania)

Introduction. Maxillary transverse defi ciency is a highly prevalent malocclusion. It can be easily managed in growing patients, however, treatment becomes more complex with age. Recently, it has been demonstrated that it is possible to expand maxilla in grown patients using mini-screw anchorage. Aim. To evaluate remaining changes in palatal depth, curvature length and arch width after minis-crew-assisted rapid palatal expansion (MARPE) in young adults.Materials. Three patients 16 to 22 year of age with posterior crossbite and treated with MARPE followed by a straight-wire appliance were selected. Dental casts were obtained and evaluated two times: prior to maxillary expansion and during the straight-wire appliance phase. Palatal depth, curvature length and interdental distances were measured.Results. All measurements showed increase after MARPE, but the smallest change was noticed in the oldest patient. Increase in palatal depth up to 1 mm and in the palatal curvature distance by 12-15% was observed. Arch width increased on average by 5 mm between molars and premolars and by 3.5 mm between canines.Conclusions. Although the posterior crossbite was corrected and maintained during second phase of treatment, the use of MARPE in the older patient resulted in less clinically signifi cant changes in all measured dimensions.

APICAL ROOT RESORPTION IN 6 MONTHS OF ORTHODONTIC TREATMENT. A PILOT STUDYUgnė Sadauskienė (Vilnius University, Vilnius, Lithuania)Guostė Basevičiūtė (Vilnius University, Vilnius, Lithuania) Rūta Almonaitienė (Vilnius University, Vilnius, Lithuania) Indrė Narbutytė (Vilnius University, Vilnius, Lithuania)

Intoduction. Root resorption is one of the main complications during orthodontic treatment. Accord-ing to Levander et al 5-6 months are required for reliable radiological representation of root resorp-tion. The aim of this study was to evaluate root resorption degree and frequency after 6 months of orthodontic treatment with conventional brackets.Materials. 31 patient, undergoing orthodontic treatment with fi xed appliances at Vilnius university hospital Zalgirio clinic, was randomly selected and periapical radiographs were made. Descriptive

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statistics and Malmgren index with Levander modifi cation was used to estimate the frequency and distribute level of root resorptions.Results. 72.3% of all examinated teeth showed some signs of apical root resorption. Most of them (70.8%) had minor (less than 1mm) root blunting. Statistically signifi cant (p<0.05) higher frequency of root resorption was found in maxillary teeth than mandibular teeth. Of all teeth, upper central incisors were noticed to have higher degree of root resorption.Conclusions. Root blunting is frequent during fi xed appliance treatment. Mild (less than 1mm) root resorption is the most common type of root resorption affecting teeth after 6 months of orthodontic treatment. Upper central incisors are the most prone to orthodontically induced apical root resorption.

THE USE OF SOCIAL NETWORKS FOR SHARING INFORMATION ABOUT BONE ANCHORAGE IN ORTHODONTIC TREATMENT Monika Šidlauskienė (Lithuanian University of Health Sciences, Kaunas, Lithuania)Mantas Šidlauskas (Lithuanian University of Health Sciences, Kaunas, Lithuania)

Introduction. Patients are more likely to be satisfi ed when they receive more information about orthodontic treatment plan. Orthodontic patient groups for sharing experience and information use online discussion forums on social networks. Bone anchorage is rather a new theme in orthodontic forums in Lithuania. The aim of this study was to assess what information do the patients share about bone anchorage.Materials. Two open-access health discussion Lithuanian forums were searched for threads related to orthodontic treatment with terms: “microimplant”, “mini implant”, “bone anchorage”. Data were collected during the period from February 2017 to June 2018. Posts were analyzed with thematic analysis, which involved reading all posts and marking ideas about bone anchorage in orthodontic treatment.Results. In two forums there were totally 20,000 comments about orthodontic treatment. In total, 108 posts about bone anchorage were included in the analysis, consisting of posts by 6,800 forum users. The main posts were (1) indications for treatment, (2) discomfort, (3) treatment success or failure and (4) treatment speed.Conclusions. From this study, it is clear that in social networks, patients seek information about all aspects of their treatment. Information materials about orthodontic treatment aspects should be given to all patients.

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INDEX OF AUTHORS

INDEX OF AUTHORS

A

Abunevičiūtė xxiAlmonaitienė xxiv, xxvAndriekutė xxiv

B

Basevičiūtė xxiii, xxvBelaka xxiBradulskaitė xxv

D

De Clerck xviDumbryte xv

G

Grybalsky xxiiiGrybauskas xxii, xxiv

I

Iodice xxii

J

Jagomägi xvi, xxJakobsone xxi, xxiiiJakutytė xxiv

K

Kavaliauskienė xviii

L

Latkauskiene xxii, xxiiiLee xxiLinkeviciene xv, xviiLinkevicius xvLipnickiene xviiLopatienė xviii, xix

M

Malinauskas xvMargelyte xxivMasiulytė xxiv

N

Narbutytė xxvNguyen xvi

P

Petronyte xxivPodchernina xvii

R

Rovienė xxv

S

Sadauskienė xxvShilova xxiŠidlauskas A. xviiiŠidlauskas M. xvi, xxviŠidlauskienė xxviSilinevica xxiSmailienė xv, xviii, xxiiiŠvalkauskienė xviii, xxiv

T

Trakinienė xviiiTrakinis xviii

U

Urtane xvii

V

Vasiliauskas xvii, xviii

W

Winsauer xix

Z

Zaleckas xviiZasčiurinskienė xix, xxiiiZnamenskaitė Levickienė xx

xxviii Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3

FLOOR PLAN

FLOOR PLAN

1.

Am

eric

an O

rthod

ontic

s2.

O

rmco

4.

KLS

Mar

tin G

roup

5.

Invi

salig

n6.

Fo

rest

aden

t7.

A

irNiv

ol (a

) & 3

M (b

)

8.

Ora

l Car

e9.

S

WE

Bal

tic10

. Ti

ger D

enta

l

12. S

K Im

peks

Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3 xxix

VILNIUS MAP

VILNIUS MAP

xxx Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3

NOTES

NOTES

Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3 xxxi

NOTES

NOTES

xxxii Stomatologija, Baltic Dental and Maxillofacial Journal, 2018, Vol. 20, No. 3