安氏Ⅱ~1类下颌后缩颞下颌关节结构与垂直骨面型、覆覆盖的相关性研究

Study on the correlation between the structure of TMJ and vertical craniofacial pattern,occlusion in ClassⅡ~1 Children

目的:探讨安氏Ⅱ1类下颌后缩颞下颌关节结构与垂直骨面型及咬合因素是否存在相关性。方法:30例安氏Ⅱ1类下颌后缩儿童(男14例,女16例),平均年龄(10.8±1.1)岁(8.1～13.0岁),分别进行TMJ的MRI扫描检查,X线头影测量和覆覆盖的模型测量,并采用pearson检验髁突位置和盘突关系与垂直骨面型和咬合因素的相关分析。结果:下颌平面角与前间隙有弱的正相关;前后面高比与所有测量项目均无相关性;后面高与代表盘突关系的Dp-Cc/Cs-Cc角有弱的正相关关系;前面高与Dp-Cc/Cs-Cc、Ca-Ca′、Ca-Cp值角均有弱的负相关关系;髁突位置与覆覆盖均无关;盘突关系与覆无关,但覆盖与Ca-Dm、Dp-Cc/Cs-Cc呈正相关,相关系数为0.420、0.460。结论:垂直骨面型与髁突后移、盘前移有一定的相关性。覆、覆盖与髁突位置无关;而覆盖越大者,盘前移位越明显,盘突关系越具有病理性。

To investigate the relationship between the structure of TMJ and the craniofacial pattern, occlusion in Class Ⅱ^1 mandibular retrusion children. Methods：TMJ MRI, lateral cephalometric were taken respectively from 30 Class Ⅱ^1 patients （ 14 boys and 16 girls, the average age was 10.8 ±1.1 years）. The condyle position and disc position were measured. The correlation of condyle and disc position with craniofacial pattern and occlusion were analyzed metrically and compared with pearson test. Results：There were low positive correlation between MP-SN angle and anterial space. No correlation between posterior-anterior ratio and other data were found. The posterior facial height and Dp-Cc/Cs-Cc angle had low positive correlation. The anterior facial height and Dp-Cc/Cs-Cc,Ca-Ca＇ ,Ca-Cp showed low negative correlation, and little correlation was found between condyle position and overbite and overjet. Overbite had no correlation with disc-condyle-fossa relationship. However, The positive correlation was found between the overjet, and Ca-Din and Dp-Cc/Cs-Cc, and Pearson coefficient is 0. 420 and 0. 460. Conclusion：Vertical craniofacial patter has relation to forward displacement of condyle and backward displacement of disc. A deeper overjet is related with a higher risk of abnormal disc-condyle-fossa relationship.