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首页> 外文期刊>The Journal of Prosthetic Dentistry >The effect of fiber reinforcement on the fracture toughness and flexural strength of provisional restorative resins.
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The effect of fiber reinforcement on the fracture toughness and flexural strength of provisional restorative resins.

机译：纤维增强对临时修复树脂的断裂韧性和弯曲强度的影响。

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STATEMENT OF PROBLEM: Fracture of provisional restorations is of concern, especially with long-span fixed partial dentures or areas of heavy occlusal stress. A number of different techniques for reinforcement of provisional restorations have been suggested; however, the effect of these techniques is largely unclear. PURPOSE: The aim of this study was to determine the fracture toughness and flexural strength of different types of provisional restoration resins reinforced with different commercially available fibers. MATERIAL AND METHODS: A total of 105 specimens were prepared in this study for each test; compact tensile specimens for the fracture toughness test and rectangular specimens for the flexural strength test. The specimens were divided into 3 groups according to the type of resin used, Jet, Trim, or Temphase (n=35), and then each group was divided into 7 subgroups (n=5) according to the type of fiber reinforcement, Construct, Fibrestick, Ribbond normal, Ribbond THM, Ribbond triaxial, or Fibrenet. Unreinforced specimens served as the control. Specimens were loaded in a universal testing machine until fracture. The mean fracture toughness (MPa.m(1/2)) and mean flexural strength (MPa) were compared by 1-way analysis of variance, followed by the Tukey standardized range test (alpha=.05). RESULTS: Fibrestick and Construct reinforcements showed a significant increase (P<.0001) in mean fracture toughness over unreinforced controls for all resins tested. Fibrestick increased the polymethyl methacrylate from 1.25+/-0.06 MPa.m(1/2) to 2.74+/-0.12 MPa.m(1/2); polyethyl methacrylate from 0.67+/-0.07 MPa.m(1/2) to 1.64+/-0.13 MPa.m(1/2); and bis-acryl from 0.87+/-0.05 MPa.m(1/2) to 1.39+/-0.11 MPa.m(1/2). Construct increased polymethyl methacrylate to 2.59+/-0.28 MPa.m(1/2); polyethyl methacrylate to 1.53+/-0.22 MPa.m(1/2); and bis-acryl to 1.30+/-0.13 MPa.m(1/2); however, there was no significant difference between Fibrestick and Construct reinforcements in the degree of reinforcement. Similarly the mean flexural strength values were significantly increased by different combinations of fiber and resin (P<.0001). CONCLUSION: The addition of fibers to provisional resin increased both fracture toughness and flexural strength.
机译：问题陈述：临时修复体的骨折值得关注，特别是对于大跨度固定局部义齿或咬合应力较大的区域。已经提出了许多加强临时修复体的技术。但是，这些技术的效果尚不清楚。目的：本研究的目的是确定用不同市售纤维增强的不同类型的临时修复树脂的断裂韧性和弯曲强度。材料与方法：这项研究为每个测试准备了105个标本。紧凑的拉伸试样用于断裂韧性测试，矩形试样用于弯曲强度测试。根据所用树脂的类型（喷射，修整或中期）将样品分为3组（n = 35），然后根据纤维增强材料的类型将每组分为7个子组（n = 5）。 ，光纤棒，普通带状，THM带状，三轴带状或光纤网。未增强的样品作为对照。将样品装入万能试验机中直至断裂。通过方差的1向分析比较平均断裂韧性（MPa.m（1/2））和平均弯曲强度（MPa），然后进行Tukey标准化范围测试（alpha = .05）。结果：对于所有测试的树脂，纤维棒和结构增强件的平均断裂韧度均比未增强的对照组显着提高（P <.0001）。纤维棒将聚甲基丙烯酸甲酯从1.25 +/- 0.06 MPa.m（1/2）增加到2.74 +/- 0.12 MPa.m（1/2）;聚甲基丙烯酸乙酯从0.67 +/- 0.07 MPa.m（1/2）至1.64 +/- 0.13 MPa.m（1/2）;双丙烯酸酯从0.87 +/- 0.05 MPa.m（1/2）到1.39 +/- 0.11 MPa.m（1/2）。构建增加的聚甲基丙烯酸甲酯至2.59 +/- 0.28 MPa.m（1/2）;聚甲基丙烯酸乙酯至1.53 +/- 0.22 MPa.m（1/2）;和双丙烯酸酯至1.30 +/- 0.13 MPa.m（1/2）;但是，Fibrestick和Construct钢筋之间的钢筋强度没有显着差异。类似地，纤维和树脂的不同组合显着提高了平均抗弯强度值（P <.0001）。结论：在临时树脂中添加纤维可提高断裂韧性和抗弯强度。

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