Department of Dentistry, Ponta Grossa State University, Parana, Brazil.
Gerodontology. 2012 Jun;29(2):e571-6. doi: 10.1111/j.1741-2358.2011.00520.x. Epub 2011 Jul 19.
The aim of the study was to evaluate the effect of long-term disinfection procedures on the Vickers hardness (VHN) of acrylic resin denture teeth.
Five acrylic resin denture teeth (Vipi Dent Plus-V, Trilux-T, Biolux-B, Postaris-P and Artiplus-A) and one composite resin denture teeth (SR-Orthosit-O) were embedded in heat-polymerised acrylic resin within polyvinylchloride tubes. Specimens were stored in distilled water at 37°C for 48 h. Measurements of hardness were taken after the following disinfection procedures: immersion for 7 days in 4% chlorhexidine gluconate or in 1% sodium hypochlorite (CIm and HIm group, respectively) and seven daily cycles of microwave sterilisation at 650 W for 6 min (MwS group). In the WIm group, specimens were maintained in water during the time used to perform the disinfection procedures (7 days). Data were analysed with anova followed by the Bonferroni procedure (α = 0.01).
Microwave disinfection decreased the hardness of all acrylic resin denture teeth (p < 0.001). Immersion for 7 days in 4% chlorhexidine gluconate or distilled water had significant effect on the hardness of the acrylic resin denture teeth A (p < 0.01), and 1% sodium hypochlorite on teeth T (p < 0.01). All disinfection procedures decrease the hardness of the composite resin denture teeth (p < 0.01). Teeth O exhibited the highest and teeth V the lowest hardness values in the control group (p < 0.01).
Disinfection procedures changed the hardness of resin denture teeth.
本研究旨在评估长期消毒程序对丙烯酸树脂义齿 Vickers 硬度（VHN）的影响。
将五颗丙烯酸树脂义齿牙（Vipi Dent Plus-V、Trilux-T、Biolux-B、Postaris-P 和 Artiplus-A）和一颗复合树脂义齿牙（SR-Orthosit-O）嵌入聚氯乙烯管内的热聚合丙烯酸树脂中。将标本在 37°C 的蒸馏水中储存 48 小时。在以下消毒程序后测量硬度：分别在 4%葡萄糖酸氯己定或 1%次氯酸钠中浸泡 7 天（CIm 和 HIm 组）和每天微波消毒 6 分钟（650 W，共 7 天）（MwS 组）。在 WIm 组中，在执行消毒程序（7 天）所用的时间内，将标本保持在水中。使用方差分析和 Bonferroni 程序（α=0.01）对数据进行分析。
微波消毒降低了所有丙烯酸树脂义齿牙的硬度（p<0.001）。在 4%葡萄糖酸氯己定或蒸馏水中浸泡 7 天对丙烯酸树脂义齿牙 A 的硬度有显著影响（p<0.01），1%次氯酸钠对牙 T 的硬度有显著影响（p<0.01）。所有消毒程序均降低了复合树脂义齿牙的硬度（p<0.01）。在对照组中，牙 O 的硬度最高，牙 V 的硬度最低（p<0.01）。
消毒程序改变了树脂义齿牙的硬度。
