嵌植義歯を目的とした歯槽骨内インプラントに関する実験的研究
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概要
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The blade implants were embedded on the 70th day after the extraction of the lower fourth premolars of the dogs, and the superprostheses, which connected the implants to the first molars, were cemented in place. From 14 to 180 days after the implantation of the blades, the implant sites were examined clinically and histopathologically. Results were summerized as follows. 1. By the 17th to 70th day after the implantation, the healing process as studied in the present implantation wounds seemed to follow the same pattern as usual tooth extraction wounds. The implants were well covered by newly formed bone trabeculae. 2. By the 90th day after the implantation, however, the development of a fibrous connective tissue between the implant and bone was observed. 3. By the 120th day after the implantation, the fibrous connective tissue surrounding the implant was enlarged, and roentgenographically, there was the evidence of radiolucent areas around the implant. 4. Nevertheless, it was noticeable that there were not distinguishable differences between 120-day and 180-day specimens roentgenographically and histopathologically. 5. The fibrous connective tissue surrounding the implant was composed of dense collagenous fibers, and simulated the periodontal ligament. The fibers were arranged parallel to implant contours, but this arrangement changed where the fibers were embedded in bone. 6. The average thickness of fibrous connective tissue surrounding the implants was 0.72mm at vent, 0.43mm at shoulder, 0.38mm at inferior apex, 0.32mm at arm in 120-day specimens, and 0.70mm at vent, 0.45mm at shoulder, 0.34mm at arm, 0.28mm at inferior apex in 180-day specimens (periodontal membrane of lower fourth premolars : 0.17-0.22mm). 7. Of the prostheses of the "sanitary" type, the inflammatory cell infiltration around the implant-posts was mild. On the other hand, of the prostheses designed in such a manner as to prevent from keeping "self-cleansing", the enlargement or the erosion of epithelium occured and the inflammatory cell infiltration was more visible than that of the "sanitary" prostheses. 8. On both types in this present study, the amount of epithelial downgrowth along the implant-posts was minimal and the extention of inflammatory infiltration to periosteum did not occur.
- 九州歯科学会の論文
- 1976-03-31
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