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Main Instructor 張恆銘
Department / Institution Department of Orthodontics /Chang Bing Show Chwan Memorial Hospital
Classification Case report
(1) Objective: Congenital missing of mandibular incisor is more frequent in oriental population. This case report describes a female patient with congenitally missing lower right central incisor. Comprehensive orthodontic treatment was done to correct the class II division 1 malocclusion and space closure for the missing tooth.
(2) Case : A 15-year-old female presents class II division 1 malocclusion and congenitally missing of one mandibular incisor. Spacing over lower anterior region causes esthetic and malocclusion problem. In consideration of facial esthetics, extractions of upper first premolars and lower second premolars, and space closure over the missing tooth was done. Interproximal reduction over the upper anterior teeth was performed to match the ideal Bolton ratio and to establish good functional occlusion.
(3) Discussion and Summary: In oriental population, some studies demonstrated missing of mandibular incisor was more prevalent than absence of maxillary lateral incisors. The possible treatment options can basically divided into three groups: space closure, space opening and canine/ premolar substitutions. Some factors have to be considered, including occlusion, number of teeth missing, skeletal pattern, molar relationship, Bolton ratio, individual tooth characteristics (size, shpe and shade), bone volume of edentulous ridge, treatment time, cost and patient’s preference. Thorough assessment and multi-factoral consideration is essential on this type of case.

Congenitally Missing of Mandibular Incisor: A Case Report