摆形矫治器矫治不同垂直骨面型安氏Ⅱ类错的疗效评价

目的　探讨摆形矫治器矫治不同垂直骨面型安氏Ⅱ类错的疗效及对牙颌面的影响。方法　对30例样本(低角组、均角组、高角组各10例)治疗前后的24项X线头影测量指标进行测量和比较分析。结果　上颌磨牙在不同的垂直骨面型中远中移动的距离不同,低角组移动最小,高角组移动最大;上颌磨牙在3组中均被压低,但差别无统计学意义;各组样本第一双尖牙向近中移动量和前牙覆盖增加量不同,低角组最多,高角组最少。结论　摆形矫治器可有效远中移动磨牙,在不同的垂直骨面型磨牙均被压低,为摆形矫治器用于矫治AngleⅡ类高角患者提供了理论依据。

Cephalometric Evaluation of the Effects of Pendulum Appliance on Various VerticalGrowth Patterns

OBJECTIVE: The aim of this study was to investigate the effects of the pendulum appliance in treating dental Class II patients with various vertical growth patterns. METHODS: The samples (n = 30) were divided into three groups equally based on their FMA. Pretreatment and post-treatment cephalometric radiographs were taken to measure the changes. RESULTS: The amount of upper molar distalization in the low-angle group was the fewest, and that in the high-angle group was the most. Upper molars had been intruded insignificantly. The amount of anchorage loss at the first premolars and overjet increased at incisors was different in the three groups. The biggest change happened in the low-angle group, and the smallest in the high-angle group. CONCLUSION: The results of this study showed that pendulum appliance could move the upper molars distally in a short period of time. The upper molars in different groups were intruded insignificantly. Pendulum appliance could be used to move the upper molars distally in high-angle cases.