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RAJIV GANDHI UNIVERSITY OF HEALTH SCIENCES

BANGALORE, KARNATAKA

ANNEXURE- II

PROFORMA FOR REGISTRATION OF SUBJECTS FOR DISSERTATION

1. NAME OF THE CANDIDATE AND

ADDRESS (In Block letters)

Dr. MURHAB AL KALBANI

POST GRADUATE STUDENT

DEPARTMENT OFORTHODONTICS &

DENTOFACIAL ORTHOPAEDICS.

THE OXFORD DENTAL COLLEGE ,HOSPITAL AND RESEARCH

CENTRE,

BOMMANAHALLI, HOSUR ROAD,BANGALORE-560068

2. NAME OF THE INSTITUTION THE OXFORD DENTAL COLLEGE ,

HOSPITAL AND RESEARCH

CENTRE,

BANGALORE-560068

3. COURSE OF THE STUDY ANDSUBJECT

MASTER OF DENTALSURGERY(M.D.S.)

IN ORTHODONTICS AND

DENTOFACIAL ORTHOPAEDICS.

4. DATE OF ADMISSION TO THE

COURSE

4TH MAY, 2009

5. TITLE OF THE TOPIC THE EFFECT OF

THERMOCYCLING ONMICROLEAKAGE BENEATH

BRACKETS BONDED WITH

FLOWABLE MATERIALS : AN IN

VITRO STUDY

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6. BRIEF RESUME OF THE INTENDED WORK

6.1 NEED FOR THE STUDY

The practice of orthodontics is constantly changing and improving with the use of new

techniques and materials that benefit both patients and clinicians. This study is to

determine and evaluate the effect of thermocycling on microleakage beneath brackets

bonded with flowable materials.

Microleakage can be defined as the filtration of bacteria, fluids, molecules, ions, and

even air between the walls of a cavity, previously prepared in readiness for restorationand the restoration materials 1. In orthodontics, microleakage may play a part in the

formation of decalcification lesions at and under the adhesive-enamel interface. The area

around a bracket is critical to the development of decalcification; the area beneath thebracket also requires investigation.

Some investigations of microleakage in conservative dentistry have been carried out

for flowable materials, since then several other new flowable materials have beenintroduced into the market for orthodontic use, such as Ormocers, Compomers 2and

Giomers. This study is intended to evaluate effects of thermocycling on microleakage

by using the above mentioned flowable materials.

6.2 REVIEW OF THE LITERATURE

A studydoneto compare, in vitro, the fluoride release, microbial inhibition and

microleakage pattern of a conventional glass ionomer cement (Ketac-Cem) and an acid-

modified composite (Ultra Band-Lok) for band cementation. They concluded that thefluoride release and anti-microbial activity of Ketac-Cem was greater than that of Ultra

Band-Lok. There was no significant difference in microleakage between the cements at

the cement/enamel interface but a borderline difference existed between the cements atthe cement/band interface. 3

The studywas done to evaluate four low-viscosity composite resin systems. A hybrid

material was used as control. The results indicate that the flowable composites

demonstrate resistance to microleakage in both enamel and cementum/dentin marginssimilar to TPH hybrid composite. 4

In this studythermocycling simulates, in vitro, thermal changes that occur in the oral

cavity. Study evaluates the influence of the number of cycles on microleakage. Class V

cavities were prepared in fifty bovine teeth, restored with single bond restorative systemand divided into five groups of teen each. Group 1 was not thermocycled (control group),

and groups 2, 3, 4 and 5 were thermocycled 500, 1000, 2500 and 5000 times,

respectively (5oC-55oC,15sec dwell time). It was concluded that there is no relation

between the increase of the number of cycles and the increase in microleakage.5

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8. LIST OF REFERENCES

1. Kidd E 1976 Microleakage: a review. Journal of Dentistry 4: 199-206

2. Bishara S, Laffoon J, Von Wold L, Warren J 2001 Evaluation of a nonrinse

conditioning solution and a compomer as an alternative method of bonding

orthodontic bracket. Angle Orthodontist 71: 461-465

3. Gillgrass T et al. 1999 Fluoride release, microbial inhibition and microleakage

pattern of two orthodontic band cements. Journal of Dentistry 27: 455-461

4. Estafan A, Stafan D 2000 Microleakage study of flowable composite resin

system. Compendium of Continuing Education in dentistry 21: 705-708

5. Pazinatto F, Campos B, Costa L, Atta M 2003 Effect of the thermocycles onmicroleakage of resin composite restorations. Pesqui Odontol Bras 17(4): 337-

341

6. Arhun N, Arman A, Cehreli S, Arikan S, Karabulut E, Gulsahi K 2006

microleakage beneath ceramic and metal brackets bonded with a conventional

and an antibacterial adhesive system. The Angle Orthodontist 76: 1028-1033

7. Vicente A et al. 2009 Microleakage beneath brackets bonded with flowable

materials: effect of thermocycling. European Journal of Orthodontics 31: 390-396

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9. SIGNATURE OF THE

CANDIDATE

10. REMARKS OF THEGUIDE

11. NAME AND

DESIGNATION (IN

BLOCK LETTERS)

11.1 GUIDE

Dr. RAGHUNANDAN CHUNDURI

READER

DEPARTMENT OF ORTHODONTICS AND

DENTOFACIAL ORTHOPAEDICS

THE OXFORD DENTAL COLLEGE ANDHOSPITAL

BANGALORE-560068

11.2 SIGNATURE

11.3 CO-GUIDE

11.4 HEAD OF THE

DEPARTMENT

Dr. P. R. RAVINARAYAN REDDY

PROFESSOR AND HEAD

DEPARTMENT OF ORTHODONTICS AND

DENTOFACIAL ORTHOPAEDICS

THE OXFORD DENTAL COLLEGE AND

HOSPITAL

BANGALORE-560068

11.5 SIGNATURE

12. 12.1 REMARKS OF THE

PRINCIPAL

12.2 SIGNATURE