16 lateral window sinus augmentation, window prepared with rotary and piezo instrument, no membrane perforation, implant placed post bone graft application, good pushback of bone. 17 ostetoomy prepared too anterior, removed remaining palatal roo requiring siginificant bone removal. prepared new osteotomy in ideal position, apical portion with densah drills, packed bone, implant placed with low stabiltiy, ,cover screws on both, 1st stage closure.