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首页> 外文期刊>International Journal of Nanomedicine >Effect of zirconium oxide nanoparticles addition on the optical and tensile properties of polymethyl methacrylate denture base material
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Effect of zirconium oxide nanoparticles addition on the optical and tensile properties of polymethyl methacrylate denture base material

机译：添加氧化锆纳米粒子对聚甲基丙烯酸甲酯义齿基托材料光学和拉伸性能的影响

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Background: Polymethyl methacrylate (PMMA) is widely used for the fabrication of removable prostheses. Recently, zirconium oxide nanoparticles (nano-ZrO2) have been added to improve some properties of PMMA, but their effect on the optical properties and tensile strength are neglected. Objective: The aim of this study was to investigate the effect of nano-ZrO2 addition on the translucency and tensile strength of the PMMA denture base material. Materials and methods: Eighty specimens (40 dumbbell-shaped and 40 discs) were prepared out of heat-polymerized acrylic resin and divided into four groups per test (n=10). The control group for each test included unreinforced acrylic, while the test groups were reinforced with 2.5, 5, and 7.5 wt% nano-ZrO2. Acrylic resin was mixed according to manufacturer’s instructions, packed, and processed by conventional method. After polymerization, all specimens were finished, polished, and stored in distilled water at 37°C for 48±2 hours. Tensile strength (MPa) was evaluated using the universal testing machine while the specimens’ translucency was examined using a spectrophotometer. Statistical analysis was carried out by SPSS using the paired sample t -test ( p ≤0.05). A scanning electron microscope was used to analyze the morphological changes and topography of the fractured surfaces. Results: This study showed that the mean tensile strength of the PMMA in the test groups of 2.5%NZ, 5%NZ, and 7.5%NZ was significantly higher than the control group. The tensile strength increased significantly after nano-ZrO2 addition, and the maximum increase seen was in the 7.5%NZ group. The translucency values of the experimental groups were significantly lower than those of the control group. Within the reinforced groups, the 2.5%NZ group had significantly higher translucency values when compared to the 5%NZ and 7.5%NZ groups. Conclusion: The addition of nano-ZrO2 increased the tensile strength of the denture base acrylic. The increase was directly proportional to the nano-ZrO2 concentration. The translucency of the PMMA was reduced as the nano-ZrO2 increased. Clinical significance: Based on the results of the current study, the tensile strength was improved with different percentages of nano-ZrO2 additions. However, translucency was adversely affected. Therefore, it is important to determine the appropriate amount of reinforcing nano-ZrO2 that will create a balance between achieved properties – mechanical and optical.
机译：背景：聚甲基丙烯酸甲酯（PMMA）被广泛用于可移动假体的制造。近来，已经添加了氧化锆纳米粒子（nano-ZrO 2 ）来改善PMMA的某些性能，但忽略了它们对光学性能和拉伸强度的影响。目的：本研究的目的是研究添加纳米ZrO 2 对PMMA义齿基托材料半透明性和拉伸强度的影响。材料和方法：用热聚合丙烯酸树脂制备80个样品（40个哑铃形和40个圆盘），每个测试分为4组（n = 10）。每个测试的对照组包括未增强的丙烯酸，而测试组则用2.5、5和7.5 wt％的纳米ZrO 2 增强。丙烯酸树脂按照制造商的说明进行混合，包装并通过常规方法进行加工。聚合后，将所有样品精加工，抛光并在37°C的蒸馏水中保存48±2小时。使用万能试验机评估拉伸强度（MPa），同时使用分光光度计检查样品的半透明性。使用配对样本t检验，通过SPSS进行统计分析（p≤0.05）。使用扫描电子显微镜分析断裂表面的形态变化和形貌。结果：这项研究表明，在2.5％NZ，5％NZ和7.5％NZ的测试组中，PMMA的平均拉伸强度显着高于对照组。加入纳米ZrO 2 后，抗拉强度显着提高，而最大增幅出现在7.5％NZ组。实验组的半透明值明显低于对照组。在强化组中，与5％NZ和7.5％NZ组相比，2.5％NZ组的透光率值明显更高。结论：纳米ZrO 2 的加入提高了义齿基体丙烯酸的拉伸强度。该增加与纳米ZrO 2 的浓度成正比。随着纳米ZrO 2 的增加，PMMA的透明度降低。临床意义：根据目前的研究结果，纳米ZrO 2 的添加比例不同，抗张强度得到了改善。但是，半透明性受到不利影响。因此，重要的是确定适当数量的增强纳米ZrO 2 ，以在机械和光学性能之间取得平衡。

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