With underdrilling at #30 (4x10 and 4x11.5 instead of 4.5x10 and 4.5x11.5), primary stability is high.  So is #28.  Abutments are placed for periodontal dressing (Fig.5).

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Xin Wei, DDS, PhD, MS 1st edition 04/30/2021, last revision 05/01/2021