Korean J Orthod.  2011 Aug;41(4):297-306. 10.4041/kjod.2011.41.4.297.

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

• Min S
• Chung C
• Hwang CJ
• Cha JY

• KMID: 2274264
• DOI: http://doi.org/10.4041/kjod.2011.41.4.297

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.

Keyword

Class III treatment; Distalizing; Superelastic Ni-Ti alloy wire; Extraction vs. nonextraction

MeSH Terms

Crowding
Dentition
Humans
Malocclusion
Molar
Tooth

Figure

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  Fig. 1 Facial and intraoral photographs.

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  Fig. 2 Panoramic and cephalometric radiographs before treatment.

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  Fig. 3 A schematic diagram for ISW tip back and elastic treatment. ISW, Improved superelastic wire.

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  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.

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  Fig. 5 Facial and intraoral photographs.

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  Fig. 6 Panoramic, PA cephalometric radiographs after treatment, and superimposition of lateral cephalogram: pre Tx (black line) to post Tx (red line).

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  Fig. 7 Intraoral photographs after 12 months of retention.

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  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.

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