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目的:研究20名云南籍正常成年人40侧颞颌关节(TMJ)位置及形态特征的基线测量值,为成人错畸形患者的相应研究提供参考数据。方法:利用16层螺旋CT,对20名经过筛选符合研究条件的志愿者的40侧TMJ进行扫描,采用多层面重建(MPR)技术对TMJ进行三维重建及参数测量。结果:40侧TMJ中23侧髁突在关节窝内处于中性位,占53%,前移位者占15%(6/40),后移位者占27.5%(11/40)。左右两侧TMJ骨性结构的参数测量左右基本对称,无显著性差异。髁突前斜面倾角与关节结节后斜面斜度高度相关,相关系数r=0.78。结论:正常成人TMJ骨性形态的左右两侧髁突基本对称,髁突在关节窝中基本处于中性位,有较轻度后移倾向,髁突与关节窝之间具有协调和平衡关系。
Objective: To study the baseline measurements of TMJ location and morphology of 40 normal adults in Yunnan, and to provide reference data for the corresponding studies of adult patients with malocclusion. Methods: Totally 40 TMJs were screened from 20 eligible volunteers using 16-slice spiral CT. Three-dimensional reconstruction and parametric measurements of TMJ were performed using multi-faceted reconstruction (MPR) technique. Results: The 23 lateral condyles in TMJ were located in the joint socket in the neutral position, accounting for 53%, 15% (6/40) in the anterior displacement and 27.5% (11/40) in the posterior displacement. The left and right TMJ skeletal structure parameter measurement about the basic symmetry, no significant difference. The condylar antelope inclination was highly correlated with the slope of the joint nodules, the correlation coefficient r = 0.78. CONCLUSION: The condyles on the left and right sides of the TMJ bony form are basically symmetrical in normal adults. The condyles are basically in the neutral position in the socket, with a slight backward tendency. The condyle and the socket are coordinated and balanced .