The implant size I tried was 5.0 X 7.3mm and it seems like bone density is quite low. 

Undersized drilling suggested (at least 2 size smaller to get more fixation). And on the facial view there's 4mm of remaining bone but on the buccolingual view, there's less than 3mm. It would be much better if you could plan to do a lateral sinus elevation in this case.  Jennifer