OBJECTIVETo investigate osteogenesis and integration of osteointergrated dental implants with marrow stromal osteoblast and cancellous bone matrix compound artificial bone (MCCAB) when embedded subcutaneously.

METHODSOsteointergrated dental implants (3 mm in diameter) were inserted into cancellous bone matrix (CBM) columns (5 mm in diameter). Marrow stromal osteoblast (MSO) were cultured and expanded in the column and on the surface. The osteointergrated dental implants loaded MSO-Alginate-CBM compound was formatted. This compound was then implanted subcutaneously in nude mice, and the osteointergrated dental implants loaded Alginate-CBM compounds were implanted as control. The compound was in the mice for 4 to 8 weeks and then harvested and assessed by means of gross observation, X-ray examination, histologic observation and computerized histomorphometry for evaluation of bone formation.

RESULTSThe osteogenesis of the osteointergrated dental implants loaded MSO-Alginate-CBM compound was better than that of the the osteointergrated dental implants loaded Alginate-CBM compound. Both intramembranous and cartilaginous osteogenesis was seen but the former was predominant. A large amount of new bone formed around the implant and integrated well with the implant. In the control, only slight cartilage osteogenesis was seen and no integration was found.

CONCLUSIONSThe results suggest that the new bone forms in the scaffolds and on the surface of the implant, and integration between the implant and artificial bone also occurs when they are implanted in the nude mice.