【摘要】 目的:探讨安氏Ⅱ1类错牙合不同骨面型牙颌垂直向形态特征。方法:选取恒牙初期的正常牙合,Ⅱ1类错牙合均角型、高角型、低角型的X线头颅侧位片各30张,男女各半,进行X线头影测量分析,通过多组间单因素方差分析及两两比较,明确Ⅱ1类错牙合3种骨面型和正常牙合的牙颌垂直向形态变化。结果:(1)所有Ⅱ1类错牙合总体上颌复合体的前部相对于后部垂直向发育过度。均角组上颌复合体整体相对发育过度,颅底一下颌支复合体发育不足;高角组上颌复合体前部发育过度,后部和颅底-下颌支复合体发育不足;均角组和高角组下颌有后下旋转的趋势。低角组颅底一下颌支复合体的垂直生长相对于上颌复合体的后部发育过度,上颌复合体前部发育正常。下颌有前上旋转的趋势。(2)Ⅱ1类错牙合L6的垂直高度降低,U6远中倾斜。高角组、均角组U6垂直高度未增加,功能牙合平面(FOP)前下倾斜,高角组U6及功能牙合平面倾斜的程度最大;低角组U6垂直高度降低,远中倾斜程度最小,功能牙合平面未见异常。结论:Ⅱ1类错牙合不同骨面型牙颌形态表现出不同的垂直向特征,治疗时垂直向控制应采取不同的措施。更多还原

【Abstract】 PURPOSE: To compare the craniofacial characteristics in Class Ⅱ1 malocclusions with different vertical types in adolescence. METHODS: The sample, including 60 males and 60 females, was divided into three groups equally based on their FMA° (high-angle group, average-angle group, low-angle group and normal occlusion group). Cephalograms were traced for all the subjects. Data were obtained to perform analysis of variance and LSD multiple range test. RESULTS: ①The vertical growth of the anterior part of maxilla was greater than the posterior part in the three groups with Class Ⅱ1 malocclusion. The vertical dimension of the composite ramus-cranial floor was deficient relative to that of anterior maxilla in the high-angle and average-angle groups, the mandible rotated backward, especially in the high-angle group. In the low-angle group, the vertical dimension of the composite ramus-cranial floor grew excessively relative to that of posterior maxilla. The palatal plane and mandible plane rotated forward and upward. ②The dentoalveolar characteristics of Class Ⅱ1 malocclusion group showed that: U6 tipped distally, the dentoalveolar height of L6 decreased, the functional occlusal plane (FOP) of average-angle group deviated away from the neutral occlusal axis (NOA), and rotated downward. In the high- angle group, the FOP deviated away from the NOA severely. The vertical dentoalveolar heights of U6 were normal. In the low-angle group, the vertical dentoalveolar heights of U6, the dentoalveolar height of L6 decreased, the angle of FOP between NOA showed no significantly difference from normal-occlusion group. CONCLUSION: There were different craniofacial vertical characteristics of Class Ⅱ1 malocclusion with different vertical types in adolescences. Different methods should be used to control the vertical dimensions in different types.更多还原