This study aims to evaluate the relationship between the maxillary intra-osseous vascular canal thickness as measured by volumetric tomography and the amount of intra-operative bleeding during open sinus floor augmentation. A sample of patients will be selected, and their maxillary intra-osseous vascular canal thickness will be measured using volumetric tomography. Intraoperative bleeding will be recorded during open sinus floor augmentation. The data will be analyzed to determine if there is a correlation between the thickness of the maxillary intra-osseous vascular canal and intraoperative bleeding.

Inclusion Criteria:

• Maxillary partial or total edentulism, including premolar/molar regions
• Medically healthy
• 2 to 5 mm residual bone height
• Sufficient bone width to place a standard dental implant (diameter >4mm)
• Age: 18-65 years
• Patients who volunteered to participate in the study and signed written informed consent

Exclusion Criteria:

• Maxillary sinusitis
• Acute myocardial infarction in the last 12 months
• Use of any medication that may inhibit bone healing
• History of radiotherapy in the head and neck region
• Presence of psychiatric problems
• Smoking more than 10 cigarettes a day
• Alcoholism
• Chronic drug use

Patients who present with the complaint of tooth loss in the posterior region and need rehabilitation with fixed prostheses on implants, whose horizontal bone width is suitable for dental implant placement but sinus floor augmentation will be performed due to insufficient vertical height.