Main Instructor Yi-Jane Chen;I-Ling Hong
Department / Institution Division of Orthodontics and Dentofacial Orthopedics, Department of Dentistry, National Taiwan University Hospital
Classification Case report
Treatment of anterior open bite malocclusion
Herein we will present the non-extraction orthodontic treatment of anterior openbite in an adult case. This patient had TMD history and underwent splint therapy for 8 months. Afterwards, she as referred to have orthodontic treatment for anterior openbite. She presented a Class II malocclusion with 4 mm overjet and 3 mm openbite. Upper incisor shown at rest was inadequate. The cephalometric analysis showed significantly excessive posterior dental height. Therefore, we decided to correct the anterior open bite by maxillary posterior intrusion. Two buccal plate and palatal miniscrews were used as bony anchorage in the upper arch. After treatment, Class I canine and molar relationship were established. The post-treatment cephalometric analysis showed the mandibular plane angle decreased from 44o to 41.5o, induced a counterclockwise rotation of mandible. The chin projection increased and the profile was nicely improved after treatment. At 1 year after treatment, minor relapse of the incisor overjet and overbite was noted. The cephalometric analysis showed that upper molar extrusion 1mm, and the upper and lower incisor positions were maintained.
「Discussion and Summary」
The long term stability of anterior open bite was always a consideration. Most of relapse was occurred at the first year. So , the design of retention was important. If a proper retention was applied , it would effectively improve the long term stability.
Treatment of Anterior Open Bite by Maxilla Posterior Teeth Intrusion