Pendulum appliance versus distal jet distalizing appliance.

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comparison between two molar distalizing appliance.

Transcript of Pendulum appliance versus distal jet distalizing appliance.

  • 1.dital jet versus pendulum appliance

2. Under the guidance of : Dr. Mohammad Mushtaq, HOD & GUIDE By: Sneh Kalgotra, 2nd Year P.G. Department of Orthodontics & Dentofacial Orthopaedics, GDC&H, Srinagar. dital jet versus pendulum appliance 3. A comparison of two intraoral molar distalization appliances: Distal jet versus pendulum Patricia P. Chiu, James A. McNamara Jr, Lorenzo Franchicdital jet versus pendulum appliance 4. About the present article Year: 2005 Volume: 128 Page number: 353-65According to the 2010 Journal Citation Reports, published by Thomson Reuters, AJO-DO is the highest ranked orthodontic title, by number of citation and impact factor. AJO-DO ranks 6th out of 74 titles for total citations in the Dentistry, Oral Surgery and Medicine category, and has a five year impact factor of 1.924. dital jet versus pendulum appliance 5. prolouge Maxillary molar distalization for non extractiontreatment of Class II patients has become increasingly popular in the last 10 years. Recently, problems related to patient compliancehave led many clinicians to prefer intraoral distalizing systems that minimize reliance on the patient and are under the orthodontists control.dital jet versus pendulum appliance 6. The distal jet and the pendulum are 2 of the morecommonly used noncompliance appliances for molar distalization.dital jet versus pendulum appliance 7. Distal jet appliancePendulum appliance dital jet versus pendulum appliance 8. A comparison of two intraoral molardistalization appliances: Distal jet versus pendulum. Title reflects the aim of the study. Variables are not clearly mentioned in the title. Independent variables are: distal jet and pendulumappliance, dependent variables are : molar distalization, skeletal changes, dentoalvelor changes. dital jet versus pendulum appliance 9. A comparison of two intraoral molar distalization appliances: Distal jet versus pendulum. It comprises of 10 words- short. It is not specific. Title is incomplete as it suggest nothing aboutthe parameters being undertaken in the study.dital jet versus pendulum appliance 10. Proposed alternative title A comparison of two intraoral molar distalizationappliances: Distal jet versus pendulum with respect to skeletal, dentoalevolar changes, pre and post distalization comparison- A cephalometric study.20 words.dital jet versus pendulum appliance 11. INTRODUCTION Introduction is meaningful. Introduction is concise. It is built on the existing literature. Citations that are reported, are relevant andpertinent to the study and followed with correct references in the list. Purpose of the study is clearly mentioned in theintroduction. dital jet versus pendulum appliance 12. Material and methodsdital jet versus pendulum appliance 13. Material and methods Inclusion criteria (1) a pretreatment Class II Division 1 malocclusion, defined by at least an end-toend molar relationship; (2) no permanent teeth extracted before or during treatment; (3) good-quality radiographs with adequate landmark visualization and minimal or no rotation of the head; and (4) no other molar distalization procedures (eg, headgear) performed between the T1 and T2 cephalograms. dital jet versus pendulum appliance 14. Material and methods Sample selection Patient sample Primary exclusionary criteria 1. Poor film quality/magnification problems 2. Incomplete records Secondary exclusionary criteria1. T1 to T2 interval greater than 12 months 2. Non-Class II malocclusion 3. Use of other molar distalization methods between T1 and T2 Final sample dital jet versus pendulum appliance94 6 1316 4 23 32 15. Material and methods In the patients in the distal jet group, coil springswere activated every 4 to 6 weeks; most patients received 3 to 5 activations. The forces generated by the Ni-Ti coils were recommended by Carano and Testa (240 g). Once a super Class I molar relationship wasachieved, the distal jet was converted to a large Nance holding arch by removing the coil springs. The extension arms to the second premolars were cut and removed to allow the premolars to drift back or be actively retracted. dital jet versus pendulum appliance 16. Material and methods The pendulum/pendex appliance used in this studywas similar to that described by Hilgers.32 With the appliance in place, the 0.032-in TMA springs were placed in the lingual sheaths on maxillary first molar bands. This 60 activation exerted approximately 230 g of distalizing force. The pendulum appliance was removed when a super Class I molar relationship was achieved. A Nance holding arch was placed after molar distalization. Typically, the occlusal rests were removed from the second premolars, and the premolars were allowed to drift posteriorly. dital jet versus pendulum appliance 17. Material and methods Cephalometric analysis The cephalometric analysis, containin measurement from the analyses of Jacobson, McNamara, Ricketts, and Steiner, consisted of 31 variables (10 angular and 21 linear) foreach tracing.Regional superimpositions were done by hand, and the 78 landmarks and the 4 fiducial markers (anterior and posterior maxilla, anterior and posterior mandible) were digitized with Dentofacial Planner. dital jet versus pendulum appliance 18. material and methods The local ethical committee was not consulted. Informed and written consent was not obtainedbefore the treatment was started.dital jet versus pendulum appliance 19. Resultsdital jet versus pendulum appliance 20. Results1. Pretreatment to postdistalization. The pendulum group showed a significantly greater correction of molar relationship (6.4 mm) and a significantly larger amount of molar distalization (U6 horizontal, 6.1 mm) compared with the distal jet group (3.8 and 2.8 mm, respectively). The maxillary first molars in the pendulum group, however, experiencedsignificantly more distal tipping (U6 to FH, 10.7) than the distal jet group (5.0). The maxillary first molars also extruded slightly in both samples (U6 vertical, 0.5-1.0 mm). dital jet versus pendulum appliance 21. Results At the end of the first phase of treatment, the pendulum group showed significantly less anchorage loss measured at the first premolars (U4horizontal, 1.4mm mesial movement) than the distal jet group (2.6 mm). The first premolars tended to extrude in both groups (U4 vertical, 1.2-1.3 mm)dital jet versus pendulum appliance 22. Results The maxillary incisors of the distal jet group. Exhibited significantly more flaring (U1 horizontal, 3.7 v 1.1 mm; U1 to FH, 13.7 v 3.1) and intrusion (U1 vertical, 1.5 v 0.1 mm) during molar distalization.dital jet versus pendulum appliance 23. Results 2. Postdistalization to end of orthodontic treatment.During the second phase of treatment with full fixed appliances, the maxillary first molars in the pendulum group showed significantly more mesial movement (5.5 mm) and mesial tipping (13.6) than the distal jet group (3.4 mm and 7.2, respectively). There were no significant differences in the horizontal and vertical movements of the first premolars between the 2 groups during the second phase of treatment. dital jet versus pendulum appliance 24. Results At the end of treatment, the pendulum group showedsignificantly more molar distalization (1.2 mm more than the distal jet group). The maxillary first molars were 0.6 mm distal to their original positions for the pendulum group, whereas they were 0.6 mm mesial for the distal jet group. Both appliances, however, induced the same amount of correction in molar relationships (2.9 mm). After comprehensive treatment, the maxillaryincisors of the distal jet subjects were 1.6 mm more labial than those of the pendulum subjects. dital jet versus pendulum appliance 25. Conclusion This study compared the treatment effects ofthe distal jet with concurrent full-fixed appliances and the pendulum appliance followed by fixed appliances.1. During molar distalization, the pendulum subjects demonstrated significantly more distal molar movement and significantly less anchorage loss at both the premolars and the maxillary incisors than did the distal jet group. dital jet versus pendulum appliance 26. Conclusion 2. The distal jet used simultaneously with fixed appliances and the pendulum were equal in their abilities to move the molars bodily. 3. At the end of comprehensive treatment, the maxillary first molars were 0.6 mm mesial to their original positions in the distal jet group, and 0.5 mm distal in the pendulum group. Nevertheless, total molar correction was identical in the 2 groups (3.0 mm), and both appliances were equally effective in achieving a Class I molar relationship at the end of treatment. dital jet versus pendulum appliance 27. Conclusion 4. Simultaneous edgewise orthodontic treatmentduring molar distalization in the distal jet group shortened the overall treatment time but produced significant flaring of both maxillary and mandibular incisors at the end of treatment.dital jet versus pendulum appliance 28. Review of literaturedital jet versus pendulum appliance 29. Bolla E, Muratore F, Carano A, Bowman SJ. Evaluation of maxillary molar distalization with the distal jet: a comparison with other contemporary methods. Angle Orthod 2002;72:481The rst molars were tipped distally an average of 3.18, however, the amount of tipping in each case was inuenced by the state of eruption of the second molar. In subjects whose second molars had erupted only to the level of the apical third of the rst molar roots, distal tipping was almost twice that seen when the second molar had completed their eruption.dital jet versus pendulum appliance 30. Ngantung V, Nanda RS, Bowman SJ. Posttreatment evaluation of the distal jet appliance. Am J Orthod Dentofacial Orthop 2001;120:178-85. The distal jet also showed less tipping of themaxillary molars and better bodily movement of molars because the force was applied closer to the center of resistance. The observations of treatment outc