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A healing abutment is placed at #31 because of supraeruption of the tooth #2 (Fig.4,5), while a cementation abutment is placed at #30 (Fig.5) with autogenous bone (from drills) and allograft placed around it (*, Fig.6).
Xin Wei, DDS, PhD, MS 1st edition 01/14/2019, last revision 01/15/2019