关键词: 正中关系位, 最大牙尖交错位, AD2牙合架, 髁突位移

Abstract: Objective To identify condylar displacement from maximum intercuspation(MIC) to central relation(CR) in asymptomatic adults. Methods Oral casts and X-ray cepholamettics of the subjects were taken, then sieved and measured by jarabak method and MIC occlusal record was acquired. CR position was acquired by Roth technique and then AD2 facebow, bite fork and the wax record were used to transfer the occlusal relation to AD2 articulator. The change of occlusion relation on mounted cast and the condylar displacement between CR and MIC with Measures Condylar Displacement（MCD) were tested. The data were recorded and a statistical analysis was conducted. Results ①The amount of condylar displacement from MIC to CR in sagital，vertical and transverse direction presented Gaussian distribution(P>0.05). ②About 34.5% subjects’ MIC-CR condylar displacement didn’t overrun the Roth physiological range; and there was no obvious difference between the overruan group (To) and the normal group (T1)(P>0.05). ③About 31.1% subjects’ MIC-CR condylar displacement was discrepancy in three-dimension; and there was no obvious difference between consistent group(TC) and discrepant group(TD)(P>0.05). ④In the correlation analysis between MIC-CR bilateral condylar displacement and X-ray cephalometrics parameter, L angle and G0 angle had positive correlation with left sagittal displacement(r=0.385, r=0.467); SG0/NMe had negative correlation with bilateral vertical displacement(r=-0.442,r=-0.380). Conclusion Since the standard of people with no TMD symptom hasn’t come to an agreement, it’s possible that the false negative exists. The conclusion is different from former ones in which it implies the huge difference of physiological compensatory of the stomatognathic system.

Key words: Centric relation , Maximum intercuspation , AD2articulator , condyle displacement