Comparison of two different xenografts in sinus augmentation

Method: Ten patients with less than 5 mm of residual alveolar bone height in the posterior maxilla underwent bilateral sinus augmentations performed by using Bio-Oss^® on one side and cerabone^® on the other. Then lateral bony windows were covered with two different collagen membranes, Bio-Gide^® and collprotect^®, respectively. Cone beam computerized tomography (CBCT) was used to visualize ridge heights before and at 8 months during implant placement. Bone biopsies were obtained with trephine bur from pre-selected implant sites for histologic analysis during dental implant placement.

Result: Wound healing was uneventful on both sites. Baseline ridge heights at Bio-Oss^® + Bio-Gide^® site increased from 4,02 ± 1,70 mm to 15,06 ± 1,61 mm whereas 3,47±1,71 mm to 14,6 ± 2,37 mm on the other side at 8 months. CBCT analysis revealed no statistically significant differences between Bio-Oss^®+ Bio-Gide^® and cerabone^® +collprotect^® sites at baseline and 8 months after the augmentation (p>0,05). Histological analysis presented graft particles surrounded by newly formed woven bone at both sides. Histomorphometric analysis showed that newly formed bone and residuel graft particles was 20.99% and 7.86%, 22.17% and 15.16% in Bio-Oss^®  and cerabone^® respectively with no significant difference between the groups (p>0,05).

Conclusion: Within the limits of this study both materials have similar histologic appearance and new bone formation that accomodates the placement of dental implants.