Yerliyurt Kaan, Taşdelen Taha Buğra, Eğri Özlem, Eğri Sinan
Department of Prosthodontics, Faculty of Dentistry, Tokat Gaziosmanpaşa University, 60250 Tokat, Türkiye.
Institute of Graduate Studies, Bioengineering Division, Tokat Gaziosmanpaşa University, 60250 Tokat, Türkiye.
Polymers (Basel). 2023 Jul 28;15(15):3211. doi: 10.3390/polym15153211.
Polymethylmethacrylate (PMMA) has been the most-widely used denture base material in prosthetic dentistry for the last 80 years. It is still one of the best alternatives when new methods are inapplicable. Due to the lack of some physical inadequacies occurring during cyclic use and accidental situations, various reinforcement strategies such as using nanoparticles, wires, fibers, and meshes have been investigated and reported. In this study, it was aimed to conduct a comparative investigation of the effect of fiber additives with different characteristics on the flexural properties of heat-cured PMMA denture base resins. Glass fibers (GFs), polypropylene fibers (PPFs), and carbon fibers (CFs) having 3, 6, and 12 mm lengths and 0.25, 0.50, and 1.0% concentrations (/) were used for the reinforcement of PMMA denture base resins. The flexural properties (flexural strength, flexural modulus, and maximum deformation) were determined using a three-point bending test, and three-way ANOVA analyses with Bonferroni corrections were performed on the test results. The morphologies of the fracture surfaces were analyzed using scanning electron microscopy. All three fibers exhibited reinforcement in the flexural strength ( < 0.001) and flexural modulus ( < 0.001) regardless of their length and concentration. The group with 1.0% 12 mm CF-reinforced PMMA exhibited the greatest flexural strength (94.8 ± 8.8 MPa), and that with 1.0% 3 mm GFs displayed the lowest flexural strength (66.9 ± 10.4 MPa) among the fiber-reinforced groups. The greatest value of the flexural modulus was displayed by the 1.0% 3 mm CF-reinforced resin (3288.3 ± 402.1 MPa). Although the CF-reinforced groups exhibited better flexural properties, CFs are not favorable for use as reinforcement in practice due to the dark gray discoloration of the denture base resin. It was concluded that PPF is a promising material for the reinforcement of heat-cured PMMA denture base resins.
在过去的80年里，聚甲基丙烯酸甲酯（PMMA）一直是口腔修复学中使用最广泛的义齿基托材料。当新方法不适用时，它仍然是最佳选择之一。由于在循环使用和意外情况下会出现一些物理性能不足的问题，人们对各种增强策略进行了研究和报道，如使用纳米颗粒、金属丝、纤维和网。在本研究中，旨在对不同特性的纤维添加剂对热固化PMMA义齿基托树脂弯曲性能的影响进行比较研究。使用长度为3、6和12毫米、浓度为0.25%、0.50%和1.0%（/）的玻璃纤维（GFs）、聚丙烯纤维（PPFs）和碳纤维（CFs）对PMMA义齿基托树脂进行增强。使用三点弯曲试验测定弯曲性能（弯曲强度、弯曲模量和最大变形），并对试验结果进行带有Bonferroni校正的三因素方差分析。使用扫描电子显微镜分析断裂表面的形态。无论长度和浓度如何，所有三种纤维均表现出对弯曲强度（<0.001）和弯曲模量（<0.001）的增强作用。在纤维增强组中，1.0% 12毫米CF增强的PMMA组表现出最大弯曲强度（94.8±8.8兆帕），而1.0% 3毫米GFs增强的组表现出最低弯曲强度（66.9±10.4兆帕）。1.0% 3毫米CF增强的树脂表现出最大弯曲模量值（3288.3±402.1兆帕）。尽管CF增强组表现出更好的弯曲性能，但由于义齿基托树脂会出现深灰色变色，CF在实际应用中不利于用作增强材料。得出的结论是，PPF是热固化PMMA义齿基托树脂增强的一种有前途的材料。
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