An Experimental Model for Maxillary Sinus elevation and Bone Grafting with Simultaneous Implant Placement with Osteotome technique

Objective:To establish an animal model for maxillary sinus elevation and bone grafting with simultaneous implantation with osteotome. Methods:The first and second molars of 16dog's maxilla were extracted and sinus floor were elevated. The heights of elevation were 2mm and 4mm. One side was grafted with autogenous bone and the other side was not grafted. After 3, 6, 12 and 24-week, 4dogs were sacrificed at the same time. The samples were evaluated by general observation, radiographic observation and histology examination. Results:Grafted bone integrated with "base bone", the implants got stable, and the sinus membrane remained intact. When sinus elevation attained to 2mm height, the bone was formed on the top of the implants. When sinus elevation attained to 4mm height, no bone was formed on the top of implant. All grafted bone formed new bone and osteogenesis of autografted bone was observed at the top of implants. Conclusions:Dog has ideal anatomic conditions for maxillary sinus elevation. Membrane remains intact after elevation and grafted bone was integrated with implants. Dogs can be used as animal model for maxillary sinus elevation with simultaneous bone graft and implant placement.