アブストラクト（34巻4号：神奈川歯学）

神奈川歯学

Japanese

Title　： 加熱重合型アクリルレジンの重合時の収縮に対する新規開発抑制材の研究
Subtitle　： アクリルレジンの物性への影響およびその収縮抑制機序について
Authors　： 小幡清夫, 楳本貢三, 久保文信*
Authors（kana）　： おばたきよお, うめもとこうぞう, くぼふみのぶ
Organization　： 神奈川歯科大学歯科理工学教室, *大成歯科工業株式会社
Journal　： 神奈川歯学
Volume　： 34
Number　： 4
Page　： 209-221
Year/Month　： 1999 / 12
Article　： 原著
Publisher　： 神奈川歯科大学学会
Abstract　： 加熱重合型アクリルレジンを用いて義歯床を作製する際に行われているモノマー・ポリマー成型では, 石こう型との摩擦などによりレジンの重合収縮や熱収縮は抑制されるが, 0.5%以上もの大きな線収縮が生じることが報告されており1, 2), この収縮が義歯床の口腔粘膜への適合性の低下, とくに総義歯では口蓋部における床の浮き上がりの原因と考えられている3～7). 床用アクリルレジンの加熱重合時における収縮への対策, およびレジン床の適合性の改良法としては, これまでメチルメタクリレート(以下, MMAと略す)モノマーに代わる新規モノマーを単独8～10)で用いる方法, あるいはMMAとの混合物として用いる方法11), またはMMAとの共重合体にして用いる方法12, 13), さらには架橋剤14)ならびに重合促進剤15)を加えることによって収縮を減少させる方法, あるいはキュアリングサイクルを含む加熱重合法そのものの改良16～23)や, 冷却方法の検討24)などが報告されている.
Practice　： 歯科学
Keywords　： 義歯床用レジン, 重合収縮抑制剤, 物性

English

Title　： Study on Novel Inhibitor of Shrinkage during Heat-cured Acrylic Resin Processing
Subtitle　： Its Inhibitory Mechanism and the Effect on Properties of the Acrylic Resin
Authors　： Kiyoo OBATA, Kozo UMEMOTO, Fuminobu KUBO*
Authors（kana）　：
Organization　： Department of Dental Materials, Kanagawa Dental College, *Taisei Dental Manufacturing Co., Ltd.
Journal　： Kanagawa Shigaku
Volume　： 34
Number　： 4
Page　： 209-221
Year/Month　： 1999 / 12
Article　： Original article
Publisher　： Kanagawa Odontological Society
Abstract　： To improve the fitness of heat-cured acrylic resin denture base, the effects of the addition of shrinkage inhibitors to the acrylic resin liquid and its inhibitory mechanism on dimensional changes occurring in the denture during processing were studied. The shrinkage inhibitors used were a mixture of 10.0 mass% N-acryloylmorpholine, 1.0 mass% coumarone-indene resin and 0.6 mass% isostearyl alcohol added to the acrylic resin liquid, and 4.0 mass% of indazole alone. The effect of the inhibitors in preventing the polymerization- and processing temperature-induced dimensional changes was evaluated by measuring linear shrinkage in artificial dentures the fitness was also assessed. The mechanical properties of cured resin containing the shrinkage inhibitors tested were estimated by measuring both the bending strength and dynamic viscoelasticity, and then the resistance to water was assessed by water-absorption test. Furthermore, the reaction mode of the shrinkage inhibitors was investigated by acetone-absorption test and Fourier transform infrared spectroscopy (FTIR). Thermal shrinkage and the linear coefficient of thermal expansion were not affected by the inhibitors; instead, the linear polymerization-induced shrinkage of the resin was prevented by the addition of the inhibitors. The mechanical properties and water absorption of the cured resin were not interfered by the inhibitors. In addition to this, the fitness of the artificial resin denture base was preferentially improved when the inhibitors were added to the acrylic resin liquid. There was no decrease in acetone-absorption in the presence of the inhibitors, suggesting that the effect afforded by the inhibitors may not be due to the interaction with three-dimensional molecular network formation reaction, and be distinct from the effect of cross-linking agents. The results from FTIR experiment also suggest that the inhibitors used in the present study can form a copolymer in the concominant presence of methyl methacrylate monomer and elicit inhibitory effect on dimensional changes occurring during heat-cured resin processing.
Practice　： Dentistry
Keywords　：