Ribeiro Daniela Garcia, Pavarina Ana Cláudia, Machado Ana Lucia, Giampaolo Eunice Teresinha, Vergani Carlos Eduardo
Department of Dental Materials and Prosthodontics, São Paulo State University, UNESP, Araraquara Dental School, São Paulo, Brazil.
Quintessence Int. 2008 Nov;39(10):833-40.
To evaluate the effect of microwave disinfection on the flexural strength and Vickers hardness of 4 autopolymerized resins (Kooliner [K], Tokuso Rebase Fast [T], Ufi Gel Hard [U], and New Truliner [N]) and 1 denture base resin (Lucitone 550 [L]).
For each material, 48 specimens (64 x 10 x 3.3 mm) were made and divided into 6 equal groups (n = 8). In the control group, specimens were untreated. Before testing, specimens were immersed in 200 mL of distilled water and submitted to disinfection for 1 of the following irradiation times: 1, 2, 3, 4, or 5 minutes. The irradiation procedure was performed twice. The flexural strength was determined using a testing machine MTS-810 and measurements of Vickers hardness were made on Micromet 2100. The values were submitted to ANOVA and Tukey's test (P = .05).
The K material showed a significant increase (P = .0010) in flexural strength following 5 minutes of disinfection compared to control specimens. The flexural strength mean values of materials T, U, and N were not significantly affected (P > .05) by disinfection. Compared to the control group, the K material showed a significant increase in hardness (P < .001) following disinfection for 3, 4, and 5 minutes. For material U, disinfection for 4 and 5 minutes produced specimens with significantly increased hardness values (P < .001) compared to the control group. For material N, disinfection for 5 minutes resulted in significantly higher hardness values (P < .001) than the control group.
Regardless of the irradiation time, the flexural strength and hardness of the materials evaluated were not detrimentally affected by microwave disinfection.
评估微波消毒对4种自凝树脂（Kooliner [K]、Tokuso Rebase Fast [T]、Ufi Gel Hard [U]和New Truliner [N]）以及1种义齿基托树脂（Lucitone 550 [L]）的弯曲强度和维氏硬度的影响。
对于每种材料，制作48个试件（64×10×3.3毫米）并分为6个相等的组（n = 8）。在对照组中，试件不做处理。在测试前，将试件浸入200毫升蒸馏水中，并按照以下照射时间之一进行消毒：1、2、3、4或5分钟。照射程序进行两次。使用MTS - 810测试机测定弯曲强度，并在Micromet 2100上测量维氏硬度。将数据进行方差分析和Tukey检验（P = 0.05）。
与对照试件相比，K材料在消毒5分钟后弯曲强度显著增加（P = 0.0010）。材料T、U和N的弯曲强度平均值未受到消毒的显著影响（P > 0.05）。与对照组相比，K材料在消毒3、4和5分钟后硬度显著增加（P < 0.001）。对于材料U，消毒4和5分钟产生的试件硬度值与对照组相比显著增加（P < 0.001）。对于材料N，消毒5分钟导致硬度值显著高于对照组（P < 0.001）。
无论照射时间如何，所评估材料的弯曲强度和硬度均未受到微波消毒的不利影响。
