著者

寺岡 文雄 北原 一慶 木村 博

出版者

一般社団法人日本歯科理工学会

雑誌

歯科材料・器械. Special issue, 日本歯科理工学会学術講演会講演集 (ISSN:02865858)

巻号頁・発行日

vol.12, no.21, pp.244-245, 1993-03-15

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レーザ変位計を用いた非接触法により、臨床に近い状態での模型材の凝結膨張を測定し、凝結膨張率と模型材の寸法精度との関係について検討した。ニューフジロック、インディックダイストーン、ニュープラストーン、モデルマティリアルの凝結膨張率は、それぞれ0.09%、0.10%、0.29%、0.76%であり、各メーカーの値よりも大きくなったが、こらは非接触法による測定法を用いたためだと思われる。

著者

寺岡 文雄 北原 一慶 多田 広宣 中川 正史 高橋 純造

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.39, no.2, pp.274-279, 1995-04-01 (Released:2010-08-10)

参考文献数

12

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Dimensional changes of complete dentures, which were constructed by six conventional polymerization methods, were investigated after polymerization and during storage. The discrepancy at median line and alveolar ridge was larger in the dentures constructed in a water bath at 70°C for 40 min and then at 100°C for 30 min, in a hot press and by microwave polymerization than in a water bath at 70°C for 24 hrs, for 8 hrs and by autopolymerization. The discrepancy at the denture border of the dentures constructed by autopolymerization during storage in water for 30 days was 0.174±0.048 mm and in the case of the dentures constructed by other polymerization methods was less than 0.1 mm. Since the dimensional changes of the dentures during storage in water occurred up to 7 days, it seems reasonable that wearing dentures or occlusional adjustment should be carried out after storage in water for more than 7 days. The discrepancy was 3 to 4 times in the dentures stored in air than in water. When the dentures which were stored in air for 30 days was immersed in water for 30 days, the discrepancy at the denture border of the dentures constructed by autopolymerization was restored to 0.214±0.097 mm, but in the case of other polymerization methods, it was restored to about 0.14 mm.

著者

寺田 久仁子 岩本 佳代子 小林 睦 辻野 政司 寺岡 文雄 荒川 行生 恩田 光子 前田 頼伸

出版者

一般社団法人日本医療薬学会

雑誌

医療薬学 (ISSN:1346342X)

巻号頁・発行日

vol.35, no.2, pp.96-102, 2009 (Released:2010-02-07)

参考文献数

21

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Bone cements have been widely used to fill the dead space of bone tissues in orthopaedic surgeries.Loaded with antibiotics,these materials are also administered for the prevention and treatment of infections,infectious osteomyelitis for example.We made polymethylmethacrylate cement preparations of five commercial vancomycin (VCM) products and compared the in vitro dissolution profiles of the VCM in them and mechanical strengths of the cements.When immersed in phosphate buffer (PB) for 30 days,dissolved amounts of VCM ranged between just 5 and 19% of the calculated contents and after immersion in PB for 40 days mechanical strengths were significantly decreased (50-75% of the control without VCM).Further,on testing a cement preparation containing pharmaceutical additives as well as VCM,the amount of antibiotic released was significantly larger than that for other preparations and the release was more rapid as well.This cement preparation also had the lowest strength among those studied.By doing this,we showed that pharmaceutical additives could have marked effect on the dissolution of the antibiotic and mechanical strength for antibiotic-laden bone cements for the first time,though these were in vitro findings.The present study clearly demonstrated that the antibiotic products used can cause functional differences in antibioticladen bone cements and also suggested that pharmaceutical additives influence cement functions.It is therefore necessary to pay attention to both the antibiotic content of commercial VCM products and types of pharmaceutical additive in the preparation of such cements.

著者

寺岡 文雄 杉田 順弘 木村 博

出版者

一般社団法人日本歯科理工学会

雑誌

歯科材料・器械. Special issue, 日本歯科理工学会学術講演会講演集 (ISSN:02865858)

巻号頁・発行日

vol.11, no.19, pp.220-221, 1992-04-30

著者

寺岡文雄

雑誌

歯科技工

巻号頁・発行日

vol.24, no.4, pp.468-473, 1996

被引用文献数

1

著者

木村 博 寺岡 文雄 斉藤 隆裕

出版者

一般社団法人日本歯科理工学会

雑誌

歯科材料・器械 (ISSN:02865858)

巻号頁・発行日

vol.4, no.3, pp.205-208, 1985-05-25

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重合過程の加熱重合レジンと常温重合レジンの内部に生じる応力について検討し, さらに重合後のレジンを120℃まで加熱後, 室温まで冷却したときのレジン内部に生じる応力についても検討した.重合終了後はレジン内部に圧縮応力が生じ, 加熱重合レジンが176kgf/cm^2で最も少なく, 常温重合レジンを50℃で重合したときは251kgf/cm^2で, 23℃で重合したときは338kgf/cm^2であった.重合後のレジンを加熱すると, 加熱重合レジンは約120℃で内部応力は0となり, 常温重合レジンは約60℃で応力は0になった.