各種重合法による義歯床用レジンの寸法変化について

概要

論文の詳細を見る
Several polymerizing methods are available for fabricating acrylic resin denture. In this study, some characteristics were compared among heat-cured, cold-cured and microwave-cured resins for plate specimen and lower complete denture model. Three different heating processes were adopted for the heat-curing resin : conventional 70℃-2h and successive 100℃-0.8h heating, 80℃-8h heating and 60℃-8h heating in water. Pour type and injection type resins were employed for cold-curing. In the microwave-curing resin, the microwave was irradiated for three minutes. The results obtained were summarized as follows. 1. The temperature of the heat-curing and cold-curing resins during polymerization almost followed the environment temperature for curing, while in the microwave-curing resin the temperature rose rapidly to about 130℃. 2. The specific volume of the heat-cured resin was increased as the curing temperature was lowered. The microwave-cured resin showed about the same value as that of the heat-cured resin processed at 100℃. In the cold-cured resin, the pour type showed larger value than the injection type. 3. The residual amount of monomer was about 2% in the heat-cured resin processed at 100℃ and the microwave-cured resin, 3 to 5% in the 80℃-8h heat-cured resin and the cold-cured resins, and as high as 8% in the 60℃-8h heat-cured resin. The residual monomer showed slight decrease with time, and the decrement was generally larger in the specimens stored in water than in air. 4. The contraction of the specimen measured just after deflasking was the largest in the microwave-cured resin and the smallest in the injection type cold-cured resin. 5. When the specimen was stored in water, further contraction by stress release occurred during a few days after deflasking and then expansion by swelling appeared in all the resins. 6. When the specimen was stored in air, on the other hand, all the resins always tended to contract by stress release and elimination of water. The contraction was marked during the five days after deflasking. 7. When the specimen was stored in water and in air alternately, all the resins showed a gradual decrease in dimension as a whole by repeating a small contraction and expansion alternately. 8. In the lower complete denture model, the dental arch width at the molar region decreased by processing and storing after deflasking, showing about the same tendency as the plate specimen mentioned above.
九州歯科学会の論文
1988-12-25

各種重合法による義歯床用レジンの寸法変化について

スポンサーリンク

概要

著者

関連論文

スポンサーリンク