后倾弯及V 形曲唇弓对安氏Ⅱ类高角患者打开咬合的临床疗效

摘要：目的 探讨安氏Ⅱ类高角患者打开咬合的快速有效方法。方法 20 例安氏Ⅱ类高角患者采用带有后倾弯及V 形曲的唇弓，放于直丝弓托槽的龈方，形成弓丝托槽的点接触，以利于咬合的打开。咬合打开后结扎入槽保持打开效果。并通过X 线头影测量分析比较患者矫治前后的变化。结果 患者的ANB 角、U1C- PP（mm）、L1C-MP（mm）、OB（mm）治疗后均比治疗前减少，且差异有统计学意义；而患者的U6- PP（mm）、L6-MP（mm）、FH-MP 角治疗前后的差异无统计学意义，可见治疗后，患者前牙得到真正压低而后牙垂直高度得到了控制。结论 安氏Ⅱ类高角患者，在直丝弓矫治中应用该唇弓可有效压低切牙，使高角型Ⅱ类错!患者深覆!明显改善，具有良好的临床效果。

关键词:安氏Ⅱ类错!畸形,高角,后倾弯,V形曲

Abstract:Objective To study the effects of lip- arch with tip back bend and V bend to the Angle Ⅱ with overbite and high angle patients. Methods 20 patients with overbite and high angle were selected and treated with lip- arch. The lip- arch was ligatured on straight wire bracket wings. It generated the point- contact between the wire and the bracket, which was of benefit to opening the overbite. After opening the overbite, the square wire changed was ligatured in bracket slot to maintain the efficacy. Their cephalometry radiographs were measured and analyzed before and after treatment. Results The angle of ANB and distance of U1C- PP（mm）, L1C-MP（mm）, OB（mm）were statistically significant before and after treatment. But there was no difference in the U6- PP

（mm）, L6-MP（mm）and FH-MP angle. Conclusion It suggest that lip- bow with tip back bend and V bend can effectively improve the deep overbite in class Ⅱ patients with high angle by controlling the anchorage.