Cheng Hui-Juan, Chen Yu-Qin, Geng Yi, Zhang Fu-Qiang
Department of Prosthodontics, College of Stomatology; Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China.
Shanghai Kou Qiang Yi Xue. 2008 Feb;17(1):55-9.
To evaluate the effect of position of occlusal interference on the track of mandibular incisal point during lateral movement.
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.
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+0.1082 x 1,delta=0.1786,P<0.001; to contralateral side,y;=9.1098+0.07099 x 1-0.02650 x 2,delta=0.05989,P<0.001.
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.Supported by Shanghai Leading Academic Discipline Project (Grant No. T0202).
评估咬合干扰位置对下颌侧方运动时下切牙切点轨迹的影响。
采用Arcus DigMa下颌运动轨迹分析系统记录下颌切牙切点轨迹随咬合干扰位置变化的情况。分析咬合干扰位置与下颌切牙切点在矢状轴、垂直轴和水平轴上运动轨迹的相关性。使用SAS 9.0软件包对咬合干扰位置与下颌侧方运动轨迹之间的线性相关性进行回归分析。
结果显示，随着咬合干扰的后移，下颌切牙切点向对侧和同侧水平轴上的移动距离均有增加趋势。下颌切牙切点在水平轴上的移动距离与咬合干扰位置的线性回归方程如下，向同侧，y = 8.2,262 + 0.1,082x1，δ = 0.1,786，P < 0.001；向对侧，y = 9.1,098 + 0.0,7099x1 - 0.0,2650x2，δ = 0.0,5989，P < 0.001。
咬合干扰位置对下颌侧方运动时下切牙切点轨迹有显著影响，随着咬合干扰的后移，下颌在水平轴上的侧方移动距离有增加趋势且呈线性关系。由上海重点学科项目资助（项目编号：T020,2）。
