恒牙期前牙开正畸治疗时机和疗效的研究

A clinical study on timing and effect of anterior open bite in permanent dentition

目的 通过对恒牙初期和恒牙晚期正畸治疗成功的病例进行分析 ,探讨恒牙期前牙开患者正畸治疗的时机及引起颅面形态的变化。方法 选择 13名恒牙初期和 12名恒牙期前牙开患者 ,利用计算机X线头影测量分析治疗前后的软硬组织变化 ,并进行统计学处理。结果 正畸的治疗变化以牙齿倾斜度的变化为主 ,前牙有一定的伸长 ,垂直高度有所增加 ,软组织面型有一定程度的改善。恒牙初期与恒牙期正畸治疗相比 ,除了上下前牙倾斜度的变化以外 ,还存在一定的下颌逆时针旋转趋势 ,而恒牙期者下颌平面角有顺时针旋转倾向。结论 提倡在恒牙初期即开始正畸治疗。

Objective Anterior open bite cases treated successfully with orthodontic method in permanent dentition were studied in order to determine the timing and effect of treatment.Method Anterior open bites, 13 in early permanent dentition and 12 in late permanent dentition, were selected. Hard and soft tissue features before and after treatment were measured by computer aided X ray cephalometrics. Statistical process were performed.Results Inclination of incisors changed a lot after orthodontic treatment. Anterior teeth were extruded with increase of vertical height. Profiles were improved to some extent. As the timing of treatment concerned, earlier treatment would lead to counter clockwise rotation besides changes in inclination of upper and lower anterior teeth.[WT5”HZ]Conclusions [WT5”BZ]Earlier treatment of anterior open bites was recommended.