Full arch case - only time for right side. Initial posterior osteotomy prepared short of sinus floor, remainder with densah drills, dense bone, alternated between densah and regular drills, perforation into sinus chamber and membrane. Proceeded to anterior site, thin bone, prepared osteotomy with precision drill, ridge split to 4-5mm, densah drills, attempted to place implant, loss of buccal plate, removed implant, cut vertical cuts on spit, split bite, placed implant, 5mm or so of buccal implant exposed, grafted entire site with sticky bone from allograft followed by collagen membrane soaked in prf fluid, psoterior implant osteotomy prepared in posterior position to original one, densah lift, no membrane perforation, packed some bone, implant placed.