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It appears that short implants could be placed mesial to the original sites (Fig.8), 5x5 mm at #18. The exposed buccal threads will be covered by 3-D Bond (Fig.9 white line, post decortication (red)), collagen plug and PGA suture. Healing screws are most likely used, although healing abutments should be prepared if they help wound closure.
Xin Wei, DDS, PhD, MS 1st edition 12/19/2019, last revision 04/21/2020