If the portion of the root is retained (Fig.5 *), the nearby crestal bone will be unlikely resorbed (no food impaction).  Because of limited space, check the mesial sheath after osteotomy with guide and before implant (Fig.6 I) placement.  Trim the sheath if needed.

Mesial Sheath     Last     Next

Xin Wei, DDS, PhD, MS 1st edition 05/07/2020, last revision 05/07/2020