The tooth became non-salvageable because of caries (Fig.2 C) in 2.5 years with periapical radiolucency (*).   After extraction, the bone available for implantation is probably below the sinus floor (Fig.1,3 arrowheads), 7-9 mm.

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Xin Wei, DDS, PhD, MS 1st edition 08/27/2015, last revision 08/28/2015