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目的 了解最大牙尖交错位MI与经校正得到的正中关系位CR头影测量结果差异，揭示下颌处于CR时的颅面骨骼特征。方法 用Williams CR头颅侧位片校正方法对19例错 患者MI头颅侧位片进行校正分析。结果 校正后面角、上下中切牙角显著减小，并节角、Y轴角、上下中切牙凸距显著增大，表明下颌后移；当髁突垂直向位移较大时，下颌向后移动趋势明显；面角、颌突角、ANB角、Y轴角、面轴角和上唇突度与髁突垂直向位移呈显著相关。结论校正后的CR头影测量可揭示与常规拍摄的MI位片显著不同的上、下颌骨关系，有助于错 的临床诊断和治疗设计。“,”Objective To study the difference between MI and CR cephalometrics and attempt to reveal thecharacteristics of craniofacial skeletal structure in centric jaw relation. Method The transformation method modifiedbv Williams was used to transfer cephalometric headfilm tracings taken in MI of 19 malocclusion patients. ResultsCompared with that in MI, the CR tracing shows NP-FH and IA increased significantly while S-Ar-Go, Y-axis, U1-APand Ll-AP decreased significantly, indicating that the mandible moves backward; A relatively larger vertical condylardisplacement seems to suggest a backward moving mandible with a relatively larger anterioposterior displacement sug-gesting a forward moving mandible; NP-FH, NA-PA, SNB, ANB, Y-axis, FA and UL-EP correlate significantly withthe vertical condylar displacement. Conclusion The headfilm tracing in CR reveals significantly different maxilloman-dibular relationship from that in MI and gives us important instruction in clinical diagnosis.