Table 1.

Characteristics of the patients included in the research.

Inclusion Criteria	Exclusion Criteria
Large Schneiderian membrane perforations (>15 mm) that cannot be sealed with any type of membrane by itself	Other materials than PRFs placed for sinus floor augmentation
CBCT examinations performed preoperatively and postoperatively	Patients who did not give their consent to harvest a bone core for histological analysis
Bone width (minimum 5.5 mm) and bone height (minimum 3 mm) to ensure primary implant stability	Patients who underwent a separated surgery for implant placement
Membrane suturing was possible to for a complete sealing or at least to obtain a “net”	Bone width less than 5.5 and bone height more than 7 mm