In accordance with CBCT (sagittal (Fig.6) sections) taken prior to RCT, a short bone-level implant (6.9x10 mm) is a more reasonable choice.  Bone graft (red circles) is more needed distally because of short bone height (4 vs. 9 mm).  Bone graft in the sinus is not recommended, since it may block implant placement.

Based upon the most recent X-ray (Fig.3 with large lesion), the implant should be large and long (Fig.7: 7x17 mm).

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Xin Wei, DDS, PhD, MS 1st edition 05/03/2015, last revision 02/05/2019