Effect of accelerated aging on the microhardness and color stability of flexible resins for dentures
Effect of accelerated aging on the microhardness and color stability of flexible resins for dentures
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DOI：
10.1590/s1806-83242010000100019
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发表时间：
2010-03-01
影响因子：
2.5
通讯作者：
Pesqueira, Aldiéris Alves
中科院分区：
文献类型：
--
作者：
Goiato, Marcelo Coelho;Santos, Daniela Micheline dos;Pesqueira, Aldiéris Alves
丙烯酸类树脂由于其可接受的美学和期望的特性（例如容易处理、良好的导热性、对口腔流体的低渗透性和颜色稳定性）而被广泛使用。柔性树脂被引入市场，作为替代使用传统的丙烯酸树脂在建设完全和部分可移动义齿。虽然这些树脂在美学和舒适性方面具有优势，但在相关文献中评估这些材料的色度和显微硬度变化的研究仍然很少。本研究的目的是评估两种商业品牌的柔性树脂与传统树脂Triplex相比在加速老化时的色度和显微硬度变化。根据制造商的说明书操作树脂，并将其插入硅胶基质中，以获得分为3组的21个样本：Triplex、Ppflex和Valplast。在所有老化阶段，Triplex的显微硬度值最高（p < 0.05），与其他树脂的显微硬度值有显著差异，其次是Valplast和Ppflex。柔性树脂（Ppflex和Valplast）之间的比较揭示了关于颜色的统计学显著差异（p < 0.05）。柔性树脂Ppflex和传统树脂Triplex在老化方面没有统计学显著差异（p < 0.05）。加速老化显着增加了树脂的显微硬度值，与最高值被观察到的Triplex。Valplast在加速老化后呈现出最大的颜色变化。
Acrylic resins have been widely used due to their acceptable esthetics and desirable characteristics such as easy handling, good thermal conductivity, low permeability to oral fluids and color stability. Flexible resins were introduced on the market as an alternative to the use of conventional acrylic resins in the construction of complete and partial removable dentures. Although these resins present advantages in terms of esthetics and comfort, studies assessing chromatic and microhardness alterations of these materials are still scarce in the related literature. The aim of this study was to evaluate the chromatic and microhardness alterations of two commercial brands of flexible resins in comparison to the conventional resin Triplex when submitted to accelerated aging. The resins were manipulated according to manufacturers' instructions and inserted into a silicone matrix to obtain 21 specimens divided into 3 groups: Triplex, Ppflex and Valplast. Triplex presented the highest microhardness value (p < 0.05) for all the aging periods, which was significantly different from that of the other resins, followed by the values of Valplast and Ppflex. Comparison between the flexible resins (Ppflex and Valplast) revealed a statistically significant difference (p < 0.05) as regards color. The flexible resin Ppflex and the conventional resin Triplex presented no statistically significant difference (p < 0.05) as regards aging. The accelerated aging significantly increased the microhardness values of the resins, with the highest values being observed for Triplex. Valplast presented the greatest chromatic alteration after accelerated aging.