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Since bone density seems to be high, a 11 mm long implant (Fig.3) should be stable and safe in term of sinus membrane perforation than the 14 mm long one (Fig.2). A 4.5 mm wide implant is appropriate for the space at #14.
Xin Wei, DDS, PhD, MS 1st edition 11/08/2016, last revision 11/08/2016