健康成年人颞下颌关节间隙锥形束计算机体层摄影术测量分析

目的:获得50名健康成年人100侧颞下颌关节(temporo mandibular joint,TMJ)关节间隙锥形束计算机体层摄影术(cone beam computed tomography,CBCT)测量值,并对髁突位置进行分析.方法:对经过严格筛选、符合试验设计的50名健康成年人100侧颞下颌关节行CBCT扫描,通过计算机图像分析系统,使用5种不同的测量方法对CBCT图像矢状位关节中间层面关节间隙进行定量测量研究,并对这些测量方法进行分析和评价.结果:获得了5种不同测量方法CBCT图像关节间隙测量值.3种线距定量测量方法均表明关节前间隙和后间隙差异无统计学意义(Z≤0.99,P值均大于0.05);双侧关节前、上、后间隙测量结果对应比较,差异均无统计学意义(t≤1.40,P值均大于0.05);5种测量方法双侧关节间隙ln(P/A)值间比较差异亦均无统计学意义(t≤0.74,P值均＞0.05).结论:在CBCT图像上,5种测量方法均显示髁突基本位于关节窝的中央位置,左右基本对称,但有一定的变异范围.CBCT检查可以准确地反映颞下颌关节关节间隙情况,在与颞下颌关节间隙改变相关的研究中有重要意义.

Investigation of temporomandibular joint space of healthy adults by using cone beam computed tomography

OBJECTIVE: To investigate the condyle position in the fossa and obtain the reference ranges of Temporomandibular joint (TMJ) space of 50 healthy adults (100 joints) by using cone beam computed tomography (CBCT). METHODS: Fifty healthy adults (100 joints) were selected and undergone CBCT examination in the intercuspal position. Five different methods of joint space measurement were used based on the joint sagittal middle layer of CBCT images and the results were analysed statistically. RESULTS: The reference ranges of TMJ space of CBCT images by using five measurement methods were obtained. The results of the linear measurement methods demonstrated that there were no significant differences between anterior and posterior spaces (Z0.05),no significant differences between the two side joint spaces including anterior, posterior and superior spaces (t0.05 ),and also no significant differences in ln (P/A) values between two side joints (t0.05). CONCLUSION: All the results of the five measurement methods showed that the condyle was located in the center of the fossa with a variation in the healthy adults in intercuspal position.The CBCT image of the sagittal middle layer of the joint could show the joint space accurately and has an important value in the research related to the changes of TMJ space.