Where bone resorption is severe, it appears better to use a bone-level implant (Fig.12 (immediately post immediate implant at the site of #3) ,13 (17 months postop, 13 months post cementation) drawing) to make sure that the implant is completely buried in the bone.  In the area the implant is exposed, add bone graft (red circles).  Use a long abutment with a long cuff for restoration (Fig.13 pink area).  On the other hand, the length of the smooth part of the tissue-level implant is fixed.  Sometimes for the restoration, the implant may be placed too shallow, leading to thread exposure.

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Xin Wei, DDS, PhD, MS 1st edition 05/05/2015, last revision 01/19/2018