著者

古谷野 潔 山田 隆司 松下 恭之 竹下 文隆 木原 昭裕 末次 恒夫

出版者

公益社団法人 日本口腔インプラント学会

雑誌

日本口腔インプラント学会誌 (ISSN:09146695)

巻号頁・発行日

vol.9, no.2, pp.273-278, 1996-09-30 (Released:2017-11-05)

参考文献数

20

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The purpose of this study was to examine the applicability of the newly-established method to analyze distribution of occlusal force among implant superstructure and natural teeth at different clench levels. Dental Prescale (Fuji Film Co. Tokyo) was used to record occlusal contacts and the force loaded on each of them. Four clench levels, which were 25, 50, 75, and 100%MVC, were regulated by visual biofeedback of masseter muscle EMG. This method was applied to five patients who received osseointegrated implants at the prosthodontic clinic of Kyushu University Dental Hospital attached to The Faculty of Dentistry and the applicability of the method was discussed. The results indicated that the Implant Support Ratio, which was defined in this study, can be used for the quantitative evaluation of the occlusal force distribution among implant superstructure and natural teeth at different clench levels. It was suggested that the distribution of occlusal force depends not only on the patterns of missing teeth but also the occlusal scheme and the conditions of the residual natural teeth.

著者

村井 健二 竹下 文隆 今給黎 一孝 末次 恒夫

出版者

社団法人 日本補綴歯科学会

雑誌

日本補綴歯科学会雑誌 (ISSN:03895386)

巻号頁・発行日

vol.37, no.4, pp.858-872, 1993-08-01 (Released:2010-08-10)

参考文献数

32

被引用文献数

4 3

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The difference in the tissue reaction in the tissue-titanium interface between mature (22-week-old) and young (6-week-old) rats was examined by using light microscopy with decalcifiedsemi-thin sections (1μm) and undecalcified sections (40μm) and scanning electron microscopy (SEM). A titanium implant (diameter=1.0mm: height=1.5mm) was inserted into a tibia.Rats in both groups were killed on the 1st, 3rd, 5th, 7th, 14th and 28th day after operation. The bonycontact ratio and area and thickness of the newly formed bones in the undecalcified section weremeasured with an image analysis system.On the 5th day, calcification in newly formed tissue was observed in young rats, and on the 7thday, in mature rats. On the 7th day, the mass of bone-like tissue in the mature rats was smaller thanthat in young rats. On the 28th day, the implant in both rats was almost enclosed circumferentiallywith newly-formed bone (thickness=20-30μm). However, by the image analysis, the bonycontact ratio and the area of newly formed bone in the mature rats were significantly smaller thanthose in the young rats. SEM revealed collagenous fibril-like structures (thickness=2-5μm) inthe bone-titanium interface of the mature rats, but obscure structures (thickness=0.4-0.6μm) inthat of the young rats.

著者

竹下 文隆 鮎川 保則 伊山 慎二 曽根 寛之 末次 恒夫

出版者

社団法人 日本補綴歯科学会

雑誌

日本補綴歯科学会雑誌 (ISSN:03895386)

巻号頁・発行日

vol.41, no.2, pp.188-194, 1997-04-01 (Released:2010-08-10)

参考文献数

18

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The purpose of this study was to investigate the tissue reaction to three kinds of membranes, Gore-Tex Augmentation Material (GTAM), Vicryl, and Dura Mater, placed on bone defects around the titanium implants. Nine adult dogs weighing 15kg were used in this study. The dogs were sacrificed either 2, 4, or 12 weeks after placement. Vicryl was exposed 2 weeks after placement. Histologically, it was found that Vicryl was completely resorbed, Dura Mater was replaced with connective tissue at 12 weeks, and bone defects using GTAM and Dura Mater but not Vicryl were partially filled with newly-formed bone tissue. Active bone formation was observed in the space between membranes and pre-existing bone tissue.