This study was designed to observe the initial healing of alveolar ridge bone defects of animals around the implant using a membrane technique. In control-I and -2, the defects were filled with the connective tissue 10 days after operation. So we could not expect bone formation in this site. However, this study indicated that bone formation would be ensured by maintaining the space between periosteum and bone using a membrane technique. The osteogenic mesenchymal cells would become osteoblasts in the space and produce bone tissue.
