Non-extraction treatment in Class III malocclusion by using improved superelastic NiTi wire

Sam Min; Churyung Chung; Chung-Ju Hwang; Jung-Yul Cha

doi:10.4041/kjod.2011.41.4.297

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Min, Chung, Hwang, and Cha: Non-extraction treatment in Class III malocclusion by using improved superelastic NiTi wire

Case Report

Korean Journal of Orthodontics

Korean Journal of Orthodontics 2011; 41(4): 297-306.

Published online: 31 August 2011

DOI: https://doi.org/10.4041/kjod.2011.41.4.297

Non-extraction treatment in Class III malocclusion by using improved superelastic NiTi wire

Sam Min, DDS, MS^a, Churyung Chung, DDS, MS, PhD^b, Chung-Ju Hwang, DDS, MS, PhD^c, Jung-Yul Cha, DDS, MS, PhD^b

^aGraduate Student, Department of Orthodontics, College of Dentisrty, Yonsei University, Korea.

^bAssistant Professor, Department of Orthodontics, College of Dentisrty, Yonsei University, Korea.

^cProfessor, Department of Orthodontics, College of Dentisrty, Yonsei University, Korea.

Corresponding author: Jung-Yul Cha. Department of Orthodontics, College of Dentisrty, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-752, Korea. +82 2 2228 3103, jungcha@yuhs.ac

Received 27 November 2009 Revised 10 May 2011 Accepted 13 May 2011

Abstract

Nonextraction camouflage treatment in mild Class III malocclusion is achieved by backward movement of the lower dentition and forward movement of the upper dentition. Many camouflage treatment modalities have been used for distal tipping and distal movement of mandibular posterior teeth. The amount of distal movement of mandibular dentition can be improved in cases of severe crowding, even without the patient's cooperation, by using miniscrews for anchorage. However, miniscrew insertion may be unsuccessful, and it may contact the adjacent root because of the distal movement of dentition. Distal tipping of mandibular dentition can be achieved using multiloop edgewise archwires and intermaxillary elastics. However, the complexity of this wire design causes discomfort to patients. Recently, a new treatment using improved superelastic NiTi wires (ISWs) and intermaxillary elastics has been introduced. ISWs can deliver orthodontic force more effectively, and their use with molar tip-back treatment has several advantages-this approach is effective, simple, and easy to use and reduces patient discomfort. The aim of this study was to report a case of camouflage treatment using ISW with tip-back and intermaxillary elastics for distal tipping of mandibular posterior dentition and to evaluate the effectiveness of this treatment in a clinical setting.

Keywords: Class III treatment, Distalizing, Superelastic Ni-Ti alloy wire, Extraction vs. nonextraction

Figures and Tables

Fig. 1

Facial and intraoral photographs.

Fig. 2

Panoramic and cephalometric radiographs before treatment.

Fig. 3

A schematic diagram for ISW tip back and elastic treatment. ISW, Improved superelastic wire.

Fig. 4

Intraoral photographs. A, First phase treatment for distal tipping of the crown of posterior teeth; B, 2nd phase treatment for distal tipping of the root of posterior teeth.

Fig. 5

Facial and intraoral photographs.

Fig. 6

Panoramic, PA cephalometric radiographs after treatment, and superimposition of lateral cephalogram: pre Tx (black line) to post Tx (red line).

Fig. 7

Intraoral photographs after 12 months of retention.

Fig. 8

Two-phase treatment. A, Class III molar relationship; B, 1st phase treatment for distal tipping of the crown of posterior teeth; C, 2nd phase treatment for distal tipping of the root of posterior teeth.

Table 1

Cephalometric data before and after treatment

Table 2

Cephalometric data of ISW tip back with elastic

Molar distal, The distance from the contour of mandibular first molar to true vertical line; Root distal, the distance from the apex of mandibular first molar to true vertical line; Molar vertical, the distance from the contour of mandibular first molar to true horizontal line; Root vertical, the distance from the apex of mandibular first molar to true horizontal line.

Notes

Supported by the grant of Craniofacial Deformity Research Institute at College of Dentistry, Yonsei University.

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