CONCLUSION
The results of the histologic evaluation suggest that open sinus lift surgery using CGF can be a reliable option for implant placement. Both alizarin red and hematoxylin-eosin staining techniques showed that the percentage of newly formed bone in the CGF group was significantly higher than in the control (xenograft) group after 6 months. The remaining material in the control group was significantly higher than in the intervention. On the other hand, the amount of connective tissue between both groups was the same.