人工干扰部位对下颌侧方运动轨迹的影响

Effect of position of artificial occlusal interference on mandible moving track during lateral movement

目的:观察人工干扰部位对下颌侧方运动中下颌切点运动轨迹的影响,并探讨其意义。方法:应用ArcusDigMa三维下颌运动轨迹描记系统,检查下颌侧方运动中切点运动轨迹随人工干扰部位变化而发生的改变。采用SAS9.0软件包分析人工干扰部位与下颌侧方运动中切点在矢状轴、垂直轴、水平轴上的运动轨迹的相关性,并试建立直线回归方程。结果:随着人工干扰部位的后移,不论下颌向干扰侧或向非干扰侧运动,切点在矢状轴和垂直轴的运动距离均无显著规律,与人工干扰部位也无明显相关性;而在水平轴则都有逐渐增大的趋势,并在水平轴上得到人工干扰部位与下颌切点运动距离的直线回归混合效应模型。向干扰侧运动时,y=8.2262+0.1082x1,δ=0.1786,P<0.001;向非干扰侧运动时,y=9.1098+0.07099x1-0.02650x2,δ=0.05989,P<0.001。配对t检验比较发现,下颌向干扰侧运动时,切点在水平轴的运动距离大于向非干扰侧运动时。结论:随人工干扰部位的后移,侧方运动中,下颌向外侧的可移动幅度增大,并呈现一定的线性规律。

PURPOSE： To evaluate the effect of position of occlusal interference on the track of mandibular incisal point during lateral movement. METHODS： The changes of track of mandibular incisal point along with the changing of occlusal interference position were recorded by Arcus DigMa mandibular moving track analysis system. The relativity between occlusal interference position and mandibular incisal point moving track on arrowy axis, vertical axis and horizontal axis was analyzed. Regression analysis was performed for linear correlation between occlusal interference position and mandible lateral moving track using SAS 9.0 software package. RESULTS： The results showed that along with the retrusive of occlusal interference, the moving distance of mandibular incisal point on horizontal axis both to contralateral side and to ipsilateral side tended to increase. The linear regression equation of mandibular incisal point moving distance on horizontal axis along with the occlusal interference position was as follows,to ipsilateral side,y^^=8.2262＋ 0.1082x1,δ=0.1786,P〈0.001; to contralateral side,y^^=9.1098＋0.07099x1-0.02650x2,δ=0.05989,P〈0.001. CONCLUSION： The position of occlusal interference affects the track of mandibular incisal point during lateral movement significantly, along with the retrusive occlusal interference, the mandible lateral moving distance on horizontal axis tends to be increased and shows linearity.