Perforation of the sinus membrane is one of the main complications. If this happens during the procedure, the surgical site must be repaired and another attempt for sinus elevation must be considered after healing of the membrane which usually takes a few months.
Infection is a risk of any surgical procedure. However, this rarely occurs after sinus lifts.
Failure in integration of grafted bone, in the situation, if there no enough live bone is available for implant placement, the sinus lift procedure and bone graft should be repeated.