A Study On Immediate Implantation Of Dental Osseointegrated Implants And Related Biological Materials

Immediate placement of osseointegrated implants into fresh extraction sockets would have the principle advantage of decreasing the recommended period of healing. It also would result in a guided placement of the implant, and it could reduce the resorption of the alveolar bone in the extration area. However, with the presence of a bone defect around an implant, ingrowth of soft tissue could compromise the achievement of osseointegration in the crestal bone area. Many experiments and clinical practices have proved the feasibility of immediate implantation, our previous experiment also indicated the utilizing of bBMP in combination with allograft bone could promote the new bone formation in bone defect around implants. In order to improve the success rate of immediate implantation and practice better in clinic, it's necessary to develop better bio-barrier membrane and new bone grafts related to immediate implantation. The study concentrated on the following parts: I. Preparation and evaluation of new bio-barrier membraneApplication of guided tissue regeneration technique has evolved from the concept of separating tissues during healing to that of providing a healing environment capable of regeneration of functional structures. The biomaterial characteristics and design of membranes employed in this technique play an important role in establishing and maintaining this environment. Barrier membranes must incorporate specific features that address the biological, mechanical, and clinical use requirements involved in regenerative treatment. In this experiment we prepared a titanium-reinforced used expanded polytetrafluoroethylene (e-PTFE) made in our country by heat-treated and laminated technique, cohesive force and intensity of antipressure were determined, they were 17.3g/mm~2 and 13.4g/mm~2, separately. The micro-structural properties of the nonreinforced e-PTFE membrane were preserved...