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The crown at #31 needs recementation 2 years 7 months post #30 cementation; the incomplete seating of the abutment was noted for the first time (Fig.11). 基台穿龈部分好像与牙槽嵴没有接触，所以六角形就位有问题，需要纠正。为什么不松动？
Xin Wei, DDS, PhD, MS 1st edition 11/02/2020, last revision 03/13/2021