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. 2007 Feb;16(1):42-5.
The purpose of this study was to observe the effect of position of occlusal interference on track of mandibular incisal point during protrusive 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 used for linear correlation between occlusal interference position and mandible protrusive moving track by SAS 9.0 software package.
The results showed that along with the retrusion of occlusal interference, the move distance of mandibular incisal point on arrowy axis tended to increase, while on vertical axis ineffective change happened and on horizontal axis tended to lean to the contralateral side. The linear regression equation of mandibular incisal point move distance on arrowy axis along with the occlusal interference position was: ŷ=4.9429+0.1336x(1), delta=0.3144, P<0.001.
The position of occlusal interference affected the track of mandibular incisal point during protrusive movement significantly, such as that along with the retrusion of the occlusal interference, the mandible protrusive moving track tended to be more anterior and partially to the contralateral side. There was a linear correlation between occlusal interference position and mandible moving track on the arrowy axis.
本研究旨在观察咬合干扰位置对下颌前伸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点在矢状轴、垂直轴和水平轴上运动轨迹的相关性。运用SAS 9.0软件包对咬合干扰位置与下颌前伸运动轨迹进行线性相关回归分析。
结果显示，随着咬合干扰的后移，下颌切点在矢状轴上的移动距离有增加趋势，在垂直轴上无明显变化，在水平轴上有向对侧偏移的趋势。下颌切点在矢状轴上的移动距离与咬合干扰位置的线性回归方程为：ŷ=4.9429+0.1336x(1)，δ=0.3144，P<0.001。
咬合干扰位置对下颌前伸运动时下切牙切点轨迹有显著影响，如随着咬合干扰的后移，下颌前伸运动轨迹有更向前且部分向对侧偏移的趋势。咬合干扰位置与下颌在矢状轴上的运动轨迹存在线性相关性。
