The implant crown at #30 has been cemented for ~ 4 years (Fig.1 (A: abutment)).  The lingual plateau of the implant is exposed for 1-2 years asymptomatic (Fig.2 *).  咬合面打洞，取出牙冠和基台。

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Xin Wei, DDS, PhD, MS 1st edition 04/15/2019, last revision 03/07/2021