There is calculus formation in the threads of the implant removed (Fig.1), as related to bone loss (Fig.2). 

@robert xp cai蔡小鵬  今天我终于有机会体会到植骨后骨头还是软的，怎么办呢？七毫米植体松动 20200717

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Xin Wei, DDS, PhD, MS 1st edition 03/09/2020, last revision 07/18/2020