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目的:比较青年人正常者和安氏Ⅱ类1分类错患者的下颌咀嚼运动轨迹。方法:按照实验纳入标准收集青年人正常组和安氏Ⅱ类1分类错组各15人。采用下颌运动描记仪记录实验对象下颌切牙点的咀嚼运动轨迹,分析咀嚼运动轨迹的范围(三维方向的最大位移)和方向(所选择的各位点开、闭口轨迹角),探讨安氏Ⅱ类1分类错对下颌咀嚼运动轨迹范围和方向的影响。应用SPSS 13.0统计软件对实验结果进行统计学分析。结果:正常组和安氏Ⅱ类1分类错组人群左侧咀嚼时最大左右向位移均值分别为(8.24±1.48)mm和(6.58±2.49)mm(P<0.05),右侧分别为(8.05±1.05)mm和(6.42±2.47)mm(P<0.05)。除左侧咀嚼时开口轨迹角0.5 mm位点外,正常组各位点开、闭口轨迹角均值大于安氏Ⅱ类1分类错组(P<0.05)。结论:青年安氏Ⅱ类1分类错患者咀嚼运动轨迹的最大侧向位移及开、闭口轨迹角较正常者小。
OBJECTIVE: To compare mandibular chewing motion trajectories of young people with normal and Class Ⅱ division 1 malocclusion. Methods: According to the experimental inclusion criteria, 15 young people in normal group and Class Ⅱ division 1 in malformation group were enrolled. Mandibular movement recorder was used to record the chewing motion of mandibular incisors. The range of chewing motion (the maximum displacement in three dimensions) and the direction (the open or closed trajectory angles of each point selected) were analyzed. Effect of Category 1 Wrongs on Range and Direction of Mandibular Chewing Motion Trajectory. SPSS 13.0 statistical software was used to analyze the experimental results. Results: The maximal left and right lateral displacement of the normal group and Class Ⅱ division 1 malocclusion group were (8.24 ± 1.48) mm and (6.58 ± 2.49) mm respectively (P <0.05), while the right side were (8.05 ± 1.05) mm and (6.42 ± 2.47) mm respectively (P <0.05). Except for the 0.5 mm locus of the locus of opening on the left chewing, the mean value of locus of opening and closing of each site of the normal group was greater than that of the Class Ⅱ division 1 malocclusion (P <0.05). CONCLUSION: The maximal lateral displacement and open or closed trajectory angle of chewing motion trajectory of young Angle Class Ⅱ division 1 malocclusion patients are smaller than those of normal subjects.