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. 2019 Sep;89(5):812-826.
doi: 10.2319/020118-93.1. Epub 2018 Aug 3.

A 15-year follow up of an orthodontic treatment including a lower incisor extraction and keeping the maxillary canine-premolar transposition

Soonshin Hwang, Insil Kim, Woowon Jang, Yoon Jeong Choi, Chooryung J Chung, Kyung-Ho Kim

A 15-year follow up of an orthodontic treatment including a lower incisor extraction and keeping the maxillary canine-premolar transposition

Soonshin Hwang et al. Angle Orthod. 2019 Sep.

Abstract

Lower incisor extraction is an effective option for treating lower anterior crowding in patients with a good facial profile, Class I molar occlusion, and narrow upper incisors. This report describes the successful treatment of an adolescent patient with lower anterior crowding and a transposed maxillary canine and premolar treated by extracting a lower incisor and keeping the transposed positions of the teeth. With the use of retainers, treatment results were stable up to the 2-year postretention visit. However, upon a 15-year postretention appointment, the fixed retainer had been removed and the removable retainer was no longer in use, which resulted in relapse of lower anterior alignment. Moreover, the transposed canine had extruded during this period, causing occlusal interference and gingival recession, as well as loss of tooth vitality, which indicates the importance of maintaining orthodontic retainers for long-term stable occlusion.

Keywords: Incisor extraction; Long term; Relapse; Retention; Transposition.

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Figures

Figure 1.
Figure 1.
Pretreatment extraoral and intraoral photographs.
Figure 2.
Figure 2.
Pretreatment dental casts.
Figure 3.
Figure 3.
Pretreatment radiographs: lateral cephalogram, lateral cephalometric analysis, and panoramic radiograph.
Figure 4.
Figure 4.
Diagnostic setup: (A) lower incisor extraction; (B) nonextraction with prosthetic treatment of peg lateral incisors.
Figure 5.
Figure 5.
Intraoral photographs using removable appliance and elastic.
Figure 6.
Figure 6.
Intraoral photographs during fixed orthodontic treatment.
Figure 7.
Figure 7.
Posttreatment extraoral and intraoral photographs.
Figure 8.
Figure 8.
Posttreatment dental casts.
Figure 9.
Figure 9.
Posttreatment radiographs: lateral cephalogram, lateral cephalometric analysis, and panoramic radiograph.
Figure 10.
Figure 10.
Cephalometric superimposition of before and after treatment.
Figure 11.
Figure 11.
Two-year postretention extraoral and intraoral photographs.
Figure 12.
Figure 12.
Fifteen-year postretention extraoral and intraoral photographs.
Figure 13.
Figure 13.
Fifteen-year postretention dental casts.
Figure 14.
Figure 14.
Fifteen-year postretention radiographs: lateral cephalogram, lateral cephalometric analysis, and panoramic radiograph.
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