Development of artificial tooth root by the Zirconia ceramics

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For the sake of clearifying the fundemental property of the artificial tooth root of the zirconia-ceramics, Histo-pathorogical aspects on the zirconia-ceramics dental implant and mechanical property of the zirconia-ceramics pin were studied.1.The zirconia-ceramics pins with 3 mm in diameter and 25 mm in length were made, and they were implanted on the residual ridge of lower molar region of male monkeys two months after extraction of teeth. Pathological examination was taken two months after implantation of them.1)Peri-implant tissues were distinguished from the normal tooth periodontium by newly tissue elements. And so called thick fibrous capsulation almost never appeared at the interface of the implant body. 2)The zirconia-ceramics implant bodies directly contacted the implant supporting bone. And it is also observed that the Harvers canal were constructed with the newly bone tissue and implant body.2.The materials of the investigation were collum of 4 mm in diameter and 40 mm in length, and they grinded the screw with 0.5 mm in depth and 1.25 mm in pitch, The shapes of grinding cutter were 5 kinds. The cantilever loading and three point bending were studied on the load required to crush them. 1)The strength of the pin of 4 mm in diameter of the zirconia-ceramics decreases on the grinding to the screw with 0.5 mm in depth for about 50% of the pin of 3 mm in diameter, however, the strength is a little difference on the shapes of grinding cutter. 2)The strength showed about 16 kgf on the load of cantilever stress, and it may be bear about three times on the load of poly-crystal alumina-ceramics.