[Pre-surgical orthodontic treatment of skeletal class II patients with gingival smile corrected by anterior maxillary segmental osteotomy].

[OBJECTIVE] To discuss the pre-surgical orthodontic treatment of skeletal class II patients with gingiva smile corrected by AMSO.

[METHODS] We analyzed the clinical features of 20 skeletal class II patients treated by AMSO combined with Orthodontic treatment and evaluated the effects of AMSO by means of cephalometric analysis.

[RESULTS] After the AMSO treatment, ANB angle, the height of anterior maxilla, the protrusion of the upper anterior teeth, and the of A point had reduced significantly (P < 0.05). After AMSO, the appearance of patients had been improved markedly.

[CONCLUSIONS] AMSO can correct the protrusion of the maxilla and gingival smie efficiently. The anchorage of molars should be controlled carefully. The anterior part of the upper arch should be expended orthodontically to make arch relationship. Extract the upper bicuspid half a year before the surgery was recommended. When necessary, genioplasty could be performed.