1. Objective To investigate a new method of genioplasty for treatment of a prominent mandibular angle with mandibular malformation.

2. Objective:Sumarize clinical experience in genioplasty filling with polyacrylamide hydrogel on 26 cases and search for an ideal kind of plastic meterial.

3. High position advancement genioplasty and uvulopalatopharyngoplasty for treatment of obstructive sleep apnea syndrome.

4. Methods From 1996 to 2001, mandibular angle osteotomy, mandibular outer cortex osteotomy, mandible, genioplasty and buccal pad excision were selected to treat 70 patients.

5. Chin augmentation with autogenous mandibular bone is an ideal method for genioplasty.