Recent development of maxillofacial surgery has taken an interest in the regeneration of facial bone defects. For the reconstruction of facial bone defects, autogenous bone grafts have been widely used. However, there are some clinical problems : the morbidity of donor sites, resorption of autogenous bone graft and, the availability of the proper form and size. The purpose of this study is to find the effective solutions to above problems. The present study was designed to evaluate the roles and regenerating capacity of fibrin sealant. Fibrin sealant is a newly developed substance for hemostasis, tissue sealing and wound healing. I made the experimental study on the effects and roles of bibrin sealant in sutogenous bone graft procedure to minimize the above complications and problems. Twenty-five adult white rabbits were used as the experimental material. Three trephine defects were made by drilling on the parietal bone of each rabbit. Defect size was 8x8mm. First group consisted of the rabbits which had the artificial defect on the parietal bone as control. The defect in second group was sealed up with autogenous boon chip only. Last group comprised the rabbits autografted by mixing the bone chip with the fibrin sealant. The results were carefully examined grossly and microscopically from the 3rd day to the 28th day postoperatively. The following results were obtained ; 1. The mixture of fibrin sealant and bone chip was useful for regenerating the bone defects. Most of the defects were substituted by new bone. 2. In the case of the graft with bone chip only, most defects were also filled with new bone, but less than fibrin group. 3. In the control group, new bone was formed around the peripheral area only. A mixture of fibrin sealant and autogenous bone chip plays an effective role in forming new bone. find judging from the results of this experiment, it may be expected the much use of the fibrin sealant in maxillofacial orthopedic surgery.