Fig.9 (CBCT coronal section of the tooth #13): When a D2 implant (4.5x20 mm) is placed, the apex may encounter the lateral nasal wall (*) or the nasal floor (red arrowheads).  N: nasal cavity; S: sinus.

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Xin Wei, DDS, PhD, MS 1st edition 04/23/2014, last revision 01/19/2018