Marcillo-Toala Oscar O, da Costa Rodrigo Bm, Chappuis-Chocano Ana P, Venante Helena Sandrini, Santiago Joel F Junior, Lara Vanessa S, Neppelenbroek Karin H, Porto Vinicius C
Int J Prosthodont. 2023 May 30. doi: 10.11607/ijp.8301.
This study was aimed at analyzing the effect of disinfectants on the roughness and mechanical properties of computer-aided design/computer-aided manufacturing (CAD/CAM) polymethylmethacrylate (PMMA) dentures.
Two groups of denture base resins were tested: heat-polymerized and milled blocks. The specimens were shaped (n=80) for flexural strength (FS), flexural modulus (FM), and (n=240) for the properties of roughness (Ra) and microhardness alterations (KHN). They were categorized into the following groups based on immersion: control (deionized water), H1 (1% sodium hypochlorite), H05 (0.5% sodium hypochlorite), and C2 (2% chlorhexidine) groups. The immersion periods were 0 (T0), 130 (T1), and 260 (T2) cycles. Statistical analyses were performed for flexural properties using the three-way analysis of variance (ANOVA). Microhardness and surface roughness were analyzed using repeatedmeasures ANOVA. A significance level of 5% was set.
CAD/CAM PMMA showed higher FS ( = .001) and FM ( < .001) than conventional PMMA. The KHN value was superior to the conventional PMMA ( < .001). The chemical solution affected the surface roughness of both resins (P = .007). The CAD/CAM PMMA block showed increased Ra values when H1 was used. Cycling separately increased the FS of conventional PMMA (T1 vs. baseline; < .05). However, the FM of CAD/CAM PMMA was higher (T1 and T2 vs. baseline; < .05). The time factor increased the microhardness of both resins (T2 vs. baseline; < .05).
The CAD/CAM resin showed higher values compared to conventional PMMA in all tests, regardless of the chemical solution used; however, the values obtained for both resins were clinically acceptable. Int J Prosthodont 2023. doi: 10.11607/ijp.8301.
本研究旨在分析消毒剂对计算机辅助设计/计算机辅助制造（CAD/CAM）聚甲基丙烯酸甲酯（PMMA）义齿粗糙度和机械性能的影响。
测试两组义齿基托树脂：热聚合树脂和铣削块材。制备用于弯曲强度（FS）、弯曲模量（FM）测试的样本（n = 80），以及用于粗糙度（Ra）和显微硬度变化（KHN）测试的样本（n = 240）。根据浸泡情况将其分为以下几组：对照组（去离子水）、H1组（1%次氯酸钠）、H05组（0.5%次氯酸钠）和C2组（2%氯己定）。浸泡周期为0（T0）、130（T1）和260（T2）个循环。使用三因素方差分析（ANOVA）对弯曲性能进行统计分析。使用重复测量ANOVA分析显微硬度和表面粗糙度。设定显著性水平为5%。
CAD/CAM PMMA显示出比传统PMMA更高的FS（P = .001）和FM（P < .001）。KHN值优于传统PMMA（P < .001）。化学溶液影响了两种树脂的表面粗糙度（P = .007）。当使用H1时，CAD/CAM PMMA块材的Ra值增加。循环分别增加了传统PMMA的FS（T1与基线相比；P < .05）。然而，CAD/CAM PMMA的FM更高（T1和T2与基线相比；P < .05）。时间因素增加了两种树脂的显微硬度（T2与基线相比；P < .05）。
无论使用何种化学溶液，在所有测试中，CAD/CAM树脂的值均高于传统PMMA；然而，两种树脂获得的值在临床上都是可接受的。《国际口腔修复学杂志》2023年。doi: 10.11607/ijp.8301
