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Main Instructor Ying Hsu
Kun-Fong Lee
Yu-Chuan Tseng
Department / Institution Department of Orthodontics, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
Classification Case report
   The purpose of this presentation is a case with anterior open bite and facial asymmetry following orthodontic-orthognathic surgical correction.
   A 18-year-old female presented bilateral Class III molar relationship, anterior open bite, and prominent chin. Surgery approaches including mandibular intraoral vertical ramus osteotomy (IVRO) and genioplasty (GeP) were selected after consultation at OMS department.
First of all, fixed appliance and one TAD was placed on left paramedian for pre-operative dental decompensation. Then, patient received orthognathic surgery. After surgery, elastics were used to improve interdigitation. After 2-year-8-month of treatment, stable occlusion and harmonious facial profile were achieved.
  The etiology of anterior open bite include skeletal and dental problems. This case belongs to skeletal problems. The lower jaw grew with downward and forward tendency. Besides, facial asymmetry and larger proportion of lower face were also noted. Therefore, IVRO and GeP were suggsted.
After surgery, right mandible was set back 9 mm at right and 8mm at left side. In addition, mandible rotated counterclockwise, and the anterior open bite was corrected. Finally, patient received post-operative occlusal detailing, and showed satisfactory treatment result in facial appearance and dental manifestation. However, it is still needed to assess the long-term stability.
Combined Orthodontic-orthognathic Surgical Correction of Class III Malocclusion with Anterior Open Bite and Aacial Asymmetry: A Case Report