Fig.4 (preop PA): There is a periapical lesion (*) associated with residual roots of the upper 1st bicuspid. N: nasal cavity; S: maxillary sinus.
Fig.5 is magnification of Fig4. The width of the root is ~ 5 mm; the length is near 14 mm. To achieve primary stability, the prospective implant should be engaged into new bone 3-4 mm. A soft tissue level implant is planned (3 mm associated with the gingiva). Therefore a 5x20 mm implant is planned. A tapered, instead of cylindrical, implant seems to be a good fit.
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Xin Wei, DDS, PhD, MS 1st edition 12/30/2012, last revision 02/23/2014