单侧后牙正锁[牙合]患者下颌侧方运动时的髁突轨迹特征

Characteristics of the condylar movement traces during lateral excursion of the unilateral posterior buccal crossbite

目的:探讨单侧后牙正锁(牙合)患者在下颌侧方运动过程中髁突的运动轨迹特征及其与正常(牙合)者之间的差异。方法:选取单侧后牙正锁(牙合)患者26例为实验组,个别正常(牙合)26例为对照组,应用髁突运动轴图描记仪(computer aided diagnosis axiograph,CADIAX)记录下颌侧方运动时髁突的运动轨迹。实验数据采用SPSS10.0软件包分析,选用成组t检验、配对t检验或秩和检验比较组间差异有无统计学意义。结果:实验组下颌侧方运动过程中髁突轨迹不流畅变异大,两侧运动轨迹不对称。非锁(牙合)侧髁突的矢状位移、垂直位移以及空间最大位移大于锁(牙合)侧和对照组,水平位移小于后者,差异有统计学意义(P<0.05);非锁(牙合)侧髁突的矢状倾斜度大于锁(牙合)侧和对照组,水平倾斜度小于后者,差异有统计学意义(P<0.05)。结论:单侧后牙正锁(牙合)患者下颌侧方运动过程中两侧髁突运动轨迹不对称。

PURPOSE： To investigate the characteristics of the condylar movement traces during lateral excursion of the unilateral posterior buccal crossbite and to compare the difference with the individual ideal occlusion. METHODS： Twenty-six subjects with normal occlusion and 26 subjects with unilateral posterior buccal crossbite were tested by CADIAX for the condylar movement. The lateral excursion traces were recorded. The data were analyzed using SPSS 10.0 software package, group t test,paired t test or rank sum test were used to compare the difference between the two groups. RESULTS： The condylar traces of the experiment subjects were rugged and asymmetrical. The sagittal,vertical and space shift of the non-buccal crossbite side were larger than those of the buccal crossbite side and the normal subjects, but the horizontal shift was significantly smaller （P〈0.05）. The sagittal condylar inclination of the non-buccal crossbite side was significantly larger than that of the buccal crossbite side and the normal subjects, but the transversal condylar inclination was significantly smaller（P〈0.05）. CONCLUSION： The bilateral condylar movement traces during lateral excursion of the unilateral posterior buccal crossbite are asymmetrical.