Due to the bone being harder in the molar region, a smaller and shorter implant at #30 (4x11 mm vs. 5x13 mm) shifts slightly buccally while being placed (Fig.8,9).  Sticky bone is later placed to cover the buccally exposed threads.  In fact there is a small perforation in the apical osteotomy (lingual).  Bone graft is placed before insertion of the implant.

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Xin Wei, DDS, PhD, MS 1st edition 02/18/2020, last revision 02/23/2020