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吳彥
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吳彥
Taiwan
Main Instructor Yen Wu
Yu-Hsien Wu
Yu-Hsiang Lin
Sheng-Yang Lee
Department / Institution Orthodontic Department of Wan-Fang Medical Center, Taipei, Taiwan
Classification Case report
  • ABSTRACT
  • TITLE
Objective
Bimaxillary dentoalveolar protrusion is a common dentofacial trait prevalent in Asian populations. Protrusive dentition with lip incompetence and mentalis strain is always the chief complaint of these patients. Retraction and retroclination of maxillary and mandibular incisors after extraction of four first premolars is the typical orthodontic treatment.

Case
A 19 year-old boy with bimaxillary protrusion and hypodivergent facial pattern. Protrusive lips relative to E-line and lip incompetence were noted. Intraoral and panoramic film findings revealed large overjet and existing four third molars. Study cast analysis showed bilateral Angle’s molar Class I malocclusion. Upper and lower bilateral 1st premolars were extracted. After space closure, significant retraction of both lips were achieved, and dentoalveolar protrusion was significantly improved. Fixed and removable retainers were given. The patient has been treated for 32 months and ideal occlusal function and harmonious facial profile were achieved.

Discussion and summary
Fixed retainers are indicated for the finished cases that need prolonged retention, maintenance of space closure, and prevention of rotational relapse. In this case, we gave patient fixed retainers for prolonged retention due to large amount of retraction.
Case Report: Angle’s Class I Malocclusion with Bimaxillary Dentoalveolar Protrusion