Table 1.

Study group characteristics.

Inclusion Criteria	Exclusion Criteria
Sinus floor augmentation by a lateral approach (height of residual bone less than 5 mm in posterior area)	Implant placement performed subsequently in other clinics
Schneiderian membrane perforation during the procedure	Prosthetic restoration performed in other clinics
Preoperative and postoperative CBCT (cone beam computed tomography) (6 months after surgery)	Patients who refused to be included in the study