With back up (~ 4 mm subgingival), stability is lessened; a healing screw is placed; with collagen plug, the wound is sutured (Fig.13).  最终植入4.5x10毫米植体（图十三），原来4x8.5。放置愈合螺帽和胶原塞，缝合。

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Xin Wei, DDS, PhD, MS 1st edition 09/14/2020, last revision 09/21/2020