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首页> 外文期刊>Journal of Pharmacy and Bioallied Sciences >Impact Strength and Dimensional Accuracy of Heat-Cure Denture Base Resin Reinforced With ZrO2 Nanoparticles: An In Vitro Study
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Impact Strength and Dimensional Accuracy of Heat-Cure Denture Base Resin Reinforced With ZrO2 Nanoparticles: An In Vitro Study

机译：ZrO2纳米粒子增强的热固性义齿基托树脂的冲击强度和尺寸精度：一项体外研究

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Background: Polymerization shrinkage and fracture are the two common trouble shoots with denture base resins. Polymerization shrinkage affects the dimensional accuracy and fit of the prosthesis. The effect of zirconia (ZrOsub2/sub) nanoparticles on polymerization shrinkage is not documented yet. Purpose: The aim and objective of this study were to evaluate the impact strength and dimensional accuracy of heat-cured poly methyl methacrylate (PMMA) on reinforcement with ZrOsub2/sub nanoparticles. Materials and Methods: Conventional heat-cure denture base resin (control) and the polymer reinforced with 3, 5, and 7 wt% of ZrOsub2/sub nanoparticles were prepared and used in this study. Forty bar-shaped specimens were prepared and tested for impact strength using Charpy’s type impact tester. Forty denture bases were fabricated and checked for dimensional accuracy by measuring the distance between the denture base and the cast in two different sections using the travelling microscope. Results: The impact strength decreased with increased concentration of ZrOsub2/sub and found to be least at 7 wt% concentration (2.01 ± 0.26 J/mmsup2/sup). The distance between the denture base and the cast significantly decreased both in the posterior palatal seal region (0.060 ± 0.007 cm) and mid-palatine section region (0.057 ± 0.006 cm) with ZrOsub2/sub nanoparticles reinforcement and was found to be least at 7 wt% concentration. Conclusion: Reinforcement of heat-cured PMMA with ZrOsub2/sub nanoparticles significantly increased the dimensional accuracy and decreased the impact strength.
机译：背景：聚合收缩和断裂是假牙基料树脂的两个常见故障点。聚合收缩会影响假体的尺寸精度和适合度。氧化锆（ZrO 2 ）纳米粒子对聚合收缩的影响尚未见报道。目的：本研究的目的和目的是评估热固化聚甲基丙烯酸甲酯（PMMA）对ZrO 2 纳米颗粒增强材料的冲击强度和尺寸精度。材料与方法：制备传统的热固化义齿基托树脂（对照）以及用3、5、7 wt％的ZrO 2 纳米颗粒增强的聚合物，并将其用于本研究。准备了40个棒状样品，并使用Charpy型冲击测试仪测试了冲击强度。制作了40个义齿基托，并使用移动显微镜通过测量两个不同部分的义齿基托与铸件之间的距离来检查尺寸精度。结果：冲击强度随ZrO 2 浓度的增加而降低，并且发现浓度至少为7 wt％（2.01±0.26 J / mm 2 ）。用ZrO 2 纳米颗粒增强后，在后seal密封区（0.060±0.007 cm）和中mid节区域（0.057±0.006 cm）义齿基托与铸模之间的距离均明显减小，并且发现浓度至少为7 wt％。结论：ZrO 2 纳米颗粒增强热固化PMMA的尺寸精度，降低了冲击强度。

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