Longitudinal comparative study on osteogenic capacity using two collagenated xenografts in artificial bone defects in beagles

This study aimed to evaluate the osteogenic capacity of two types of collagenated xenogenic bone grafts (OCS-B Collagen®, NIBEC, Jincheon, Korea and Bio-Oss® Collagen, Geistlich, Wolhusen, Switzerland) in artificial bone defects in beagle dogs. The bilateral mandibular premolars of 13 male beagles were extracted, followed by the creation of standardized bony defects after 4 weeks. The defects were grafted with or without the two bone grafts and covered by a collagen membrane. Dental implants were placed 24 weeks post grafting. Bone regeneration and osseointegration were evaluated using micro-computed tomography (micro-CT), as well as histological and histomorphometric analyses, while implant stability was measured using resonance frequency analysis (RFA). Micro-CT revealed that both grafts significantly increased bone mineral density (BMD), bone volume (BV), total volume (TV), and BV/TV at 8 and 16 weeks. Twenty-four weeks after implant placement, comparable BMD, BV/TV, and bone-to-implant contact values indicated effective osseointegration. Histological analysis revealed new bone formation and integration between grafts. Histomorphometric analysis demonstrated the preservation of bone height and angle. RFA indicated good implant stability in both groups. The two collagenated xenogenic bone grafts exhibited similar osteogenic potential and osseointegration in an artificial bone defect and implant model. Clinically, both grafting materials may provide comparable outcomes in bone regeneration and implant stability.