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Based on the gingival line and the sinus floor, an implant could be as large and long as 7x20 mm (Fig.4). It is impractical. First, this long tapered implant is not available. Second, too much thread will be exposed buccally if a long implant is used. Therefore 7x14 or 17 mm will be most likely suitable for the site. For the better primary stability, a 7x17 or 20 mm cylindrical implant can be used.
The mesiodistal space is large (Fig.5). A 8 mm implant could be placed if the buccal septal bone is able to be expanded buccally.
Fig.5 must have been taken obliquely (mesiodistally, in contrast to Fig.3). The buccal roots (MB, DB) appear to be separated from the palatal one (P).
Xin Wei, DDS, PhD, MS 1st edition 12/25/2014, last revision 12/25/2014