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Between the 1st and 3rd weeks postop, the buccal gingiva recedes and most likely become necrotic in the middle (due to ischemia) with loss of bone graft (Fig.8 <) and implant thread exposure (Fig.9 * (A: abutment)).
Xin Wei, DDS, PhD, MS 1st edition 10/20/2016, last revision 06/17/2018