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

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.

Tooth transposition: two case-reports and literature review

“…In the literature survey performed during this study, 12 articles reported an association between TT and agenesis 3,4,9,11,13,14,17,20,54,55,62,64 but none described the occurrence of tooth giroversion. The reported frequency of the association between TT and agenesis in previous studies was around 37-40% 16,65 .…”

Multidisciplinary management of an adult skeletal Class III patient with generalized aggressive periodontitis and canine-premolar transposition

“…21 The transposition between a canine and the first premolar teeth warrants that treatment alternatives with or without extraction be fully considered and discussed. 22,23 The extraction of either all first premolars or the transposed premolar might be valid options. In a non-extraction approach, the teeth may either be kept in the transposed position or aligned in the correct order.…”

Assessment of the outcomes and stability after mandibular incisor extraction in orthodontic patients: A systematic review and meta-analysis

“…The view on stability appears controversial as contradictory statements were found, with some reporting stable results, 7 , 16 - 18 while others reported instability and promoted the need for long-term retention. 19 The presence of lingually bonded retainers resulted in less relapse than in patients without a retainer. 20 …”