A smaller implant (6x17 mm, as compared to 8x14 mm of the 2nd case) is placed after bone expansion (Fig.8, bone appears to be soft).  The sinus floor is barely penetrated.  The tooth #13 (upper left 2nd premolar) has 3 roots and 3 canals.

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Xin Wei, DDS, PhD, MS 1st edition 09/12/2014, last revision 09/12/2014