>Objective This study evaluated the flexural strengths of reinforced denture base resins subjected to long-term water immersion. >Materials and methods Acrylic denture base resin reinforced with metal wire or glass fiber-reinforced composite (FRC), and without reinforcement were tested. Bar-shaped specimens were fabricated. Half of the specimens were stored in 37 °C distilled water for 50 hours (h), the other half were stored in 37 °C distilled water for 180 days (d) before testing. Ten specimens were fabricated per group for each reinforcement/water immersion period combination. The ultimate flexural strength and flexural strength at the proportional limit of reinforced denture base resin were tested. >Results The 180 d bulk specimen possessed significantly lower ultimate flexural strength compared with the 50 h bulk specimen (p < 0.05). The ultimate flexural strength of the 50 h metal, 50 h FRC, 180 d metal and the 180 d FRC reinforcement specimens were not significantly different from each other (p > 0.05). The 180 d bulk specimen had a significantly lower flexural strength at the proportional limit compared to the 50 h bulk specimen. The 180 d reinforced specimens of metal and FRC were not significantly different from each of the 50 h specimens. >Conclusion The flexural strengths of a reinforced denture base resin did not change after long-term water immersion.
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机译：>目的该研究评估了在长期浸入水中的增强义齿基料树脂的抗弯强度。 >材料和方法测试了用金属丝或玻璃纤维增强复合材料（FRC）增强而未增强的丙烯酸义齿基础树脂。制作棒状样品。测试前，将一半样品在37°C蒸馏水中保存50小时（h），将另一半样品在37°C蒸馏水中保存180天（d）。每组每个补强/水浸周期组合制造十个样品。测试了增强义齿基础树脂的极限抗弯强度和在比例极限下的抗弯强度。 >结果与50小时的散装样本相比，180 d散装样本的极限抗弯强度明显降低（p <0.05）。 50 h金属，50 h FRC，180 d金属和180 d FRC钢筋试样的极限弯曲强度彼此之间无显着差异（p> 0.05）。与50小时的散装样本相比，180 d的散装样本在比例极限处的抗弯强度明显较低。 180 d的金属和FRC增强标本与50 h的标本没有显着差异。 >结论：长期浸水后，增强义齿基体树脂的抗弯强度没有变化。
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