Study on Production and Evaluation of the Implant Actually Used in Dentistry

Abstract

Since titanium has a different elastic modulus from the human bone, stress shielding occurs and it causes the difficulty of direct bonding. However, making the porous titanium enables to approximate the elastic coefficient of the human bone. In vivo experiments are indispensable for practical use of porous titanium implants, but it has been considered difficult to process porous titanium into implant shapes. In this study, we aimed for in vivo experiments to embed a sample in rabbit bone, and fabricated a miniaturized implant type sample compared to the actual one used in dental care. Porous titanium was fabricated by spark plasma sintering (SPS). As a result, it was found that it was possible to prevent destruction of the specimen during fabricating by maintaining the compressive force at 30 MPa and the sintering temperature at 570°C for 15 minutes. The compressive strength of the specimen was 150 MPa.