The implant at #21 will be expected to be 3.5x11.5 mm (Fig.3).  Since the ridge at #19 and 21 is narrow (Fig.2,3 arrowheads), the keratinized gingiva should be narrow.  Incision will be made to save the latter.

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Xin Wei, DDS, PhD, MS 1st edition 08/12/2021, last revision 08/12/2021