24 placed in the usual manner with densah drills used at apical end of osteotomy, some issues with implant not going to desired depth, had to extend ostetoomy depth a few times. 25 osteotomy prepared short of sinus floor and remainder with densah drills, difficult positioning due to acute slant/slope of crestal bone inferior. positioned implant in region of more crestal bone. Entry into sinus chamber with densah drills, no evidence of sinus membrane perforation, packed about 1cc of allograft, good pushabck of bone, implant placed.