The abutment is retightened 2.5 months post cementation, which is related to mesiobuccal placement of the implant (Fig.12).  Food is reported to be impacted distally.  If the abutment becomes loose again, the lingual surface will be reduced heavily outside.

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Xin Wei, DDS, PhD, MS 1st edition 08/25/2018, last revision 09/02/2018