Fig.1: The upper left 2nd molar has 3 residual roots (MB, DB, P).

Fig.9:  Tap (T) 5x17 mm, 14mm deep.

Fig.10: Implant (I, 6x14 mm); a small gap mesially (>), which disappears 11 months postop (Fig.11).

Fig.11: In fact the implant has penetrated the sinus floor (white arrrowheads); *: caries of the 3rd molar; black arrowheads: exposed distal threads.

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Xin Wei, DDS, PhD, MS 1st edition 05/31/2013, last revision 05/01/2014