Ilbay S G, Güvener S, Alkumru H N
Faculty of Dentistry, Selçuk University, Konya, Turkey.
J Oral Rehabil. 1994 Jan;21(1):103-9. doi: 10.1111/j.1365-2842.1994.tb01129.x.
In this research the technique of curing denture base acrylic resins by microwave energy was investigated with respect to polymerization method, hardness, mechanical and physical properties. Twenty-one different polymerization methods were used by varying radiation power and curing time. The Vickers hardness test was applied to the samples which were polymerized. The average value was found to be 22.46 VHN (Vicker hardness number), that is, almost the same as conventionally cured acrylic. The recommended polymerization method of curing acrylic was 3 min at 550 W in a microwave oven. Mechanical and physical tests were applied to the samples which were cured by the recommended polymerization method. The average transverse load to fracture value was found to be 7.6 kg, and the transverse deflection value was 1.5 mm at 3500 g, and 2.9 mm at 5000 g. Water sorption of acrylic resin cured by microwave energy was 0.72 mg cm-2 and the solubility rate in water was 0.038 mg cm-2. Results conformed with the ADA specification. The findings showed that acrylic resin cured by microwave energy is more resistant to mechanical failure than conventionally cured acrylic and this technique can safely be applied to the production of denture bases.
在本研究中，针对聚合方法、硬度、机械性能和物理性能，对利用微波能量固化义齿基托丙烯酸树脂的技术进行了研究。通过改变辐射功率和固化时间，采用了21种不同的聚合方法。对聚合后的样品进行了维氏硬度测试。发现平均值为22.46 VHN（维氏硬度值），即与传统固化的丙烯酸树脂几乎相同。推荐的丙烯酸树脂固化聚合方法是在微波炉中以550 W功率固化3分钟。对采用推荐聚合方法固化的样品进行了机械性能和物理性能测试。发现平均断裂横向载荷值为7.6 kg，在3500 g时横向挠度值为1.5 mm，在5000 g时为2.9 mm。通过微波能量固化的丙烯酸树脂的吸水率为0.72 mg/cm²，在水中的溶解率为0.038 mg/cm²。结果符合ADA规范。研究结果表明，通过微波能量固化的丙烯酸树脂比传统固化的丙烯酸树脂更耐机械破坏，并且该技术可安全地应用于义齿基托的生产。
