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When the patient returns 4 months post implant removal and bone graft, the ridge at #19 is concave with a small hole which communicates with the underlying bone (Fig.1 <). 病人是个忙人，经常术后不回来复诊，正好碰上新冠病毒，今天他术后四个月第一次回来，伤口好像愈合不错。不过有一个小小开口与下面骨头相通，箭头。我能植牙吗？
Xin Wei, DDS, PhD, MS 1st edition 07/17/2020, last revision 07/25/2020