According to the plane coordinate in each image, buccolingual direction was presented as X axis, mesial-distal direction as Y axis and occlusogingival direction as Z axis.
根据各层图上建立
平面坐标，设颊
X轴，近远中Y轴，牙合龈Z轴。
, 
平线平行;;;
形;;According to the plane coordinate in each image, buccolingual direction was presented as X axis, mesial-distal direction as Y axis and occlusogingival direction as Z axis.
根据各层图上建立平面坐标，设颊X轴，近远中Y轴，牙合龈Z轴。
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