CT在颞下颌关节功能紊乱综合征中的诊断价值

目的评价CT在颞下颌关节功能紊乱综合征中的诊断价值。方法对26例（48侧关节）患者行1mm层厚轴位重叠CT扫描，扫描完成后行冠状面、矢状面二维重建。将CT检查结果与许勒位平片作比较分析。结果许勒位平片对TMJ骨质改变的阳性显示率（敏感性）为22.9％（11／48），CT为81.2％（39／48）;CT对髁状突骨质吸收、骨质增生、髁状突磨平及深状突囊样变的显示优于许勤位平片.而对髁状突、关节窝硬化的显示不如许勒位平片;CT既能显示髁状突外1／3的病变，又能显示髁状突中及内1／3的病变，而许勤氏位平片仅可显示髁状突外1／3的病变。结论CT是检查颞下颌关节骨质病变的重要而敏感的工具。

The value of CT scanning in the diagnosis of temporomandibular joint dysfunction

Objective To evaluate the role of CT in the diagnosis of temporomandibular joint dysfunction. Materials 48 temporomandibular joints of 26 patients suspecting osseous changes were examined by CT, with 1mm of layer thickness. All patients had SchQllers position projection as comparison. Results CT is more sensitive to detect the osseous changes of TMJ than Schullers position projection, but not well demonstrating sclerosis of TMJ. The Schullers position projection can only shows the lesion of lateral 1/3 of condyle, but CT including total condyle. Conclusion CT is an important and sensitive tool in detecting osseous changes of temporomandihular joint.