青年安氏Ⅱ类1分类错[牙合]患者下颌咀嚼运动轨迹特征的研究

Characteristics of mandibular masticatory movement path in the youth with Angle Ⅱ 1 malocclusion

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 investigate characteristics of masticatory movement path in young adults with Angle Ⅱ1 malocclusion. Meth- ods： 15 youths with normal occlusion（group I ） and 15 with Angle Ⅱ 1 malocclusion（group Ⅱ ） were included. Mandibular movement paths of the incisal point of the incisor during unilateral-sided gum-chewing were recorded by the BioEGN mandibular kinesiography an- alyzer. Both maximal distances and directions （FH-opening/closing angles） in sagittal plane were analyzed. The statistic analyses were performed with SPSS 13.0 software. Results： Lateral distances of left masticatory movement path in Group I and Group II were （8.24 ± 1.48） mm and （6.58 ± 2.49） mm, those of right（8.05 ±1.05 ） mm and （6.42 ±2.47） mm, respectively（P 〈 0.05 ）. The aver- age of FH- opening/closing angle of masticatory movement path in Group I was higher than that in Group Ⅱ at each level（ P 〈 0.05 ） ex- cept 0. 5 mm point in the left masticatory movement path. Conclusion： Maximal lateral distance and FH-opening/closing angle of mas- ticatory path in young adults with Angle Ⅱ 1 malocclusion are less than those with normal occlusion.