PIEZOSURGERY - ANIMATION - Sinus lift with crestal approach - Piezo-Lift technique (Vercellotti) 

so how can he create this slice of bone???

@@noorsin3586 By breaking part during surgery

Dear Doctor, The maxillary sinus membrane is an endosteum with odontoblast precursor cells and is very valuable in the formation of new bone, including a new cortical bone, so it is not convenient to leave a bone sheet that must necessarily be reabsorbed to allow irrigation and neoformation. of the new bone in the space formed in the sinus lift