Aziz Hawraa Khalid
Department of Dental Technology, Prosthetic Dental Technology, College of Health and Medical Technology, Middle Technical University (MTU), Baghdad, Iraq.
Open Dent J. 2018 Mar 26;12:202-212. doi: 10.2174/1874210601812010202. eCollection 2018.
The criteria of conventional curing of polymethyl methacrylate do not match the standard properties of the denture base materials.
This research was conducted to investigate the addition of TiO nano practical on impact strength, thermal conductivity and color stability of acrylic resin cured by microwave in comparison to the conventional cured of heat-polymerized acrylic resin.
120 specimens made of high impact acrylic resin were divided into two main groups according to the type of curing (water bath, microwave), then each group was subdivided into two groups according to the addition of 3% TiO nano-fillers and control group (without the addition of TiO 0%). Each group was subdivided according to the type of test into 3 groups with 10 specimens for each group. Data were statistically analyzed using Student t-test to detect the significant differences between tested and control groups at significance level (<0.05).
According to curing type methods, the results showed that there was a significant decrease in impact strength of microwaved cured resin, but there was no significant difference in the thermal conductivity and color stability of resin. In addition, by using nanofiller, there was a significant increase in the impact strength and color stability with the addition of 3% TiO nanofillers, but no significant difference was found in the thermal conductivity of the acrylic resin.
The microwave curing of acrylic resin had no change in the color stability and thermal conductivity in comparison to the water bath, but the impact strength was decreased. The addition of 3% TiO improved the impact and the color stability, but the thermal conductivity did not change.
聚甲基丙烯酸甲酯传统固化标准与义齿基托材料的标准性能不匹配。
本研究旨在探讨添加纳米二氧化钛对微波固化丙烯酸树脂的冲击强度、热导率和颜色稳定性的影响，并与热聚合丙烯酸树脂的传统固化进行比较。
将120个由高冲击丙烯酸树脂制成的标本根据固化类型（水浴、微波）分为两个主要组，然后每组根据是否添加3%纳米二氧化钛填料再细分为两组，对照组（不添加纳米二氧化钛0%）。每组根据测试类型再细分为3组，每组10个标本。使用学生t检验对数据进行统计分析，以检测测试组和对照组之间在显著性水平（<0.05）下的显著差异。
根据固化类型方法，结果表明微波固化树脂的冲击强度显著降低，但树脂的热导率和颜色稳定性没有显著差异。此外，通过使用纳米填料，添加3%纳米二氧化钛填料后冲击强度和颜色稳定性显著提高，但丙烯酸树脂的热导率没有显著差异。
与水浴相比，丙烯酸树脂的微波固化在颜色稳定性和热导率方面没有变化，但冲击强度降低。添加3%纳米二氧化钛可提高冲击强度和颜色稳定性，但热导率不变。
