结论正畸治疗前必须了解患者下颌处于正中关系时的咬合情况，发现与下颌位置之间的不协调。
Conclusions the occlusion in centric jaw relation should be analysed before treatment to reveal the disharmony between occlusion and jaw position.
从无牙颌位到正中关系位下颌突度减小；
The changes of the mandibular protrusionreduce from the edentulous position to the centric relation position.
从无牙颌位到正中关系位下颌突度减小；
The changes of the mandibular protrusionreduce from the edentulous position to the centric relation position.
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