特に上唇形態を考慮した下顎前突症術前矯正治療について

抄録

The number of the patients with skeletal Class III malocclusion, requiring surgical orthodontic treatment, has increased, patients' complaints range over minute details, and patients expect remarkable aesthetic prognoses.
A number of patients with skeletal Class III malocclusion have upper incisors which are inclined labially and lower incisors which are inclined lingually before treatment. Following surgical orthodontic treatment, axial inclination of upper incisors greatly affects patients' labial forms and that of lower incisors and migration range of mandibles often affect patients' mentum forms. Consequently, in presurgical orthodontic treatment, axes of incisors must be greatly corrected. Nevertheless, in some cases, mandibular migration is so slight that little aesthetic alteration results. In these cases, some patients complain of unaesthetic mouths, therefore the patients' aesthetic appearance after orthodontic treatment must be taken into consideration before the treatment.
In this report, a patient with skeletal Class III malocclusion with labially inclined upper incisors and protruding upper lip was presented. This patient had upper premolars extracted in presurgical orthodontic treatment so that she obtained morphologically good prognosis. Furthermore, the effects on the appearance of mouth were discussed when upper premolars were extracted in surgical orthodontic treatment.