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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of pre- and postpolymerization on flexural strength and elastic modulus of impregnated, fiber-reinforced denture base acrylic resins.
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Effect of pre- and postpolymerization on flexural strength and elastic modulus of impregnated, fiber-reinforced denture base acrylic resins.

机译：预聚合和后聚合对浸渍的纤维增强义齿基丙烯酸树脂的弯曲强度和弹性模量的影响。

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STATEMENT OF PROBLEM: Impregnated fibers require light polymerization; however, little information exists about how different protocols might affect the mechanical properties of reinforced denture base materials. PURPOSE: The purpose of this study was to compare the effects of pre- or postpolymerization of preimpregnated fibers on the flexural strength and elastic modulus of a reinforced autopolymerized and a heat-polymerized acrylic resin. MATERIAL AND METHODS: Seventy-two specimens were divided into 12 treatment groups (n=6), according to type of acrylic resin (autopolymerized or heat polymerized), type of reinforcement, and its pre- or postpolymerization. Impregnated glass fibers (Fibrex-Lab), unimpregnated glass fibers (Fibrante), and ribs made from a restorative composite resin (Z250) were used as reinforcements. The reinforcements were light polymerized either before or after incorporation and processing of the acrylic resins. Specimens were tested in 3-point load and the data were analyzed using2-way ANOVA and Tukey post hoc test (alpha=.05). Specimens were further examined using light microscopy, atomic force microscopy, and scanning electron microscopy. RESULTS: Elastic modulus was significantly higher for heat-polymerized acrylic resins than for autopolymerized acrylic resins (P<.001). Prepolymerized fibers increased both flexural strength and elastic modulus of autopolymerized acrylic resins significantly more than postpolymerized fibers (P<.001); however, postpolymerized fibers yielded a higher elastic modulus than prepolymerized fibers for the heat-polymerized material (P<.001). CONCLUSIONS: Prepolymerized fibers improved the overall mechanical properties of reinforced autopolymerized acrylic resins more than postpolymerized fibers. However, postpolymerization of fibers yielded higher elastic modulus for reinforced heat-polymerized acrylics.
机译：问题陈述：浸渍纤维需要光聚合;然而，关于不同协议如何影响增强义齿基体材料机械性能的信息很少。目的：本研究的目的是比较预浸渍纤维的预聚合或后聚合对增强的自聚合和热聚合丙烯酸树脂的弯曲强度和弹性模量的影响。材料与方法：根据丙烯酸树脂的类型（自聚合或热聚合），增强材料的类型及其预聚合或后聚合，将72个样品分为12个处理组（n = 6）。浸渍玻璃纤维（Fibrex-Lab），未浸渍玻璃纤维（Fibrante）和由恢复性复合树脂（Z250）制成的肋条均用作增强材料。在掺入和加工丙烯酸树脂之前或之后，使增强体进行轻聚合。在三点载荷下测试样品，并使用2通ANOVA和Tukey post hoc测试（alpha = .05）对数据进行分析。使用光学显微镜，原子力显微镜和扫描电子显微镜进一步检查样品。结果：热聚合丙烯酸树脂的弹性模量明显高于自聚合丙烯酸树脂（P <.001）。预聚合纤维对自聚合丙烯酸树脂的弯曲强度和弹性模量的提高明显大于后聚合纤维（P <.001）。然而，对于热聚合材料，后聚合纤维比预聚合纤维具有更高的弹性模量（P <.001）。结论：预聚合纤维比后聚合纤维改善了增强型自聚合丙烯酸树脂的整体机械性能。然而，对于增强的热聚合丙烯酸，纤维的后聚合产生更高的弹性模量。

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