Fig.6 (3 months postop): the sinus floor becomes less distinct, suggesting that the sinus membrane containing periosteum has been lifted.   The sinus floor has lost cortical feature.  The provisional stays in place until 3 months postop (Fig.6).  The gingiva remains healthy with the supragingival margin of the abutment (Fig.7 ^) when the definitive restoration is tried in (C).

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Xin Wei, DDS, PhD, MS 1st edition 04/07/2016, last revision 11/21/2018