In spite of no apparent loss of bone graft (Fig.4,10), the graft seems to shrink in height 3.5 months postop (Fig.11), while the crest decreases (compare Fig.1 and 11).53岁男左下6因近中根周围阴影（图一）拔除植骨（图四）。术后16天骨粉好像没有失去（图十），但是术后3.5月骨粉仿佛收缩（图十一），牙槽嵴接近牙槽窝处下降（比较所有图）。

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Xin Wei, DDS, PhD, MS 1st edition 10/28/2020, last revision 10/31/2020