Bilateral sinus graft with either bovine hydroxyapatite or beta tricalcium phosphate, in combination with platelet-rich plasma: a case report.

Background: Various techniques and many biomaterials are used in maxillary sinus floor augmentations.

Objective: To compare 2 different graft materials, bovine hydroxyapatite (BH) and pure phase beta tricalcium phosphate (TCP) associated with platelet-rich plasma (PRP) in one patient referred for bilateral sinus augmentations.

Methods: Bilateral sinus augmentations were performed with BH mixed with PRP on one side and TCP with PRP on the other side. Biopsies were performed 6 months later and 4 implants were placed.

Results: Wound healing was uneventful after both surgeries and the 4 implants were clinically successful. BH and TCP in combination with PRP led to a satisfactory increase in bone vertical dimension. The histomorphometric analysis showed differences in the number of lacunae and the proportion of fibrous tissue between both materials. Bone tissue showed a lamellar structure and a primary structure in the region grafted with TCP/PRP whereas it was exclusively primary structure on the side of BH/PRP.

Conclusions: BH and TCP have resulted in bone formation after the sinus lift procedures. Histomorphometric analysis showed some differences but both biomaterials allowed for stable clinical results. They deserve furthermore evaluation and comparison in large controlled studies and long-term histomorphometric examination.