Three-dimensional evaluation of tooth movement in Class II malocclusions treated without extraction by orthodontic mini-implant anchorage

Dler Ali; Hnd Mohammed; Seung-Hwan Koo; Kyung-Hwa Kang; Sang-Cheol Kim

Three-dimensional evaluation of tooth movement in Class II malocclusions treated without extraction by orthodontic mini-implant anchorage

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Type: Academic journal

Author: Dler Ali (Wonkwang University) Hnd Mohammed (Wonkwang University) Seung-Hwan Koo (Wonkwang University) Kyung-Hwa Kang (Wonkwang University) Sang-Cheol Kim (Wonkwang University)

Journal: KOREAN ASSOCIATION OF ORTHODONTISTS THE KOREAN JOURNAL of ORTHODONTICS Vol.46 No.5 KCI Accredited Journals SCIE

Published: 2016.9

Pages: 280 - 289 (10page)

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Three-dimensional evaluation of tooth movement in Class II malocclusions treated without extraction by orthodontic mini-implant anchorage

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Objective: The aim of this study was to analyze tooth movement and arch width changes in maxillary dentition following nonextraction treatment with orthodontic mini-implant (OMI) anchorage in Class II division 1 malocclusions. Methods: Seventeen adult patients diagnosed with Angle’s Class II division 1 malocclusion were treated by nonextraction with OMIs as anchorage for distalization of whole maxillary dentition. Three-dimensional virtual maxillary models were superimposed with the best-fit method at the pretreatment and post-treatment stages. Linear, angular, and arch width variables were measured using Rapidform 2006 software, and analyzed by the paired t -test. Results: All maxillary teeth showed statistically significant movement posteriorly (p < 0.05). There were no significant changes in the vertical position of the maxillary teeth, except that the second molars were extruded (0.86 mm, p < 0.01). The maxillary first and second molars were rotated distal-in (4.5°, p < 0.001; 3.0°, p < 0.05, respectively). The intersecond molar width increased slightly (0.1 mm, p > 0.05) and the intercanine, interfirst premolar, intersecond premolar, and interfirst molar widths increased significantly (2.2 mm, p < 0.01; 2.2 mm, p < 0.05; 1.9 mm, p < 0.01; 2.0 mm, p < 0.01; respectively). Conclusions: Nonextraction treatment with OMI anchorage for Class II division 1 malocclusions could retract the whole maxillary dentition to achieve a Class I canine and molar relationship without a change in the vertical position of the teeth; however, the second molars were significantly extruded. Simultaneously, the maxillary arch was shown to be expanded with distal-in rotation of the molars.

#Tooth movement #Class II division 1 malocclusion #Nonextraction treatment #Mini-implant anchorage

INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSION
CONCLUSION
REFERENCES

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[학술지(정기간행물)] - Park HS / 2005 / Group distal movement of teeth using microscrew implant anchorage / Angle Orthod 75 : 602 ~ 609

[학술지(정기간행물)] - Egolf RJ / 1990 / Factors associated with orthodontic patient compliance with intraoral elastic and headgear wear / Am J Orthod Dentofacial Orthop 97 : 336 ~ 348

[학술지(정기간행물)] - Keles A / 2000 / A new approach in maxillary molar distalization: intraoral bodily molar distalizer / Am J Orthod Dentofacial Orthop 117 : 39 ~ 48

[학술지(정기간행물)] - Hilgers JJ / 1992 / The pendulum appliance for Class II noncompliance therapy / J Clin Orthod 26 : 706 ~ 714

[학술지(정기간행물)] - Gianelly AA / 1991 / Japanese NiTi coils used to move molars distally / Am J Orthod Dentofacial Orthop 99 : 564 ~ 566

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