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In fact the mesial and distal surfaces of the crown should have clearance from the neighboring teeth (Fig.14) so that pick-up impression is able to hold the crown/abutment complex securely (Fig.16: *).取模前必须使用咬合纸，牙冠旋转后，某个地方咬合提高，必要调整咬合。
Xin Wei, DDS, PhD, MS 1st edition 03/08/2021, last revision 03/14/2021