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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Hydrothermal and mechanical stresses degrade fiber-matrix interfacial bond strength in dental fiber-reinforced composites.
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Hydrothermal and mechanical stresses degrade fiber-matrix interfacial bond strength in dental fiber-reinforced composites.

机译：水热应力和机械应力会降低牙科纤维增强复合材料中的纤维-基质界面粘结强度。

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Fiber-reinforced composites (FRCs) show great promise as long-term restorative materials in dentistry and medicine. Recent evidence indicates that these materials degrade in vivo, but the mechanisms are unclear. The objective of this study was to investigate mechanisms of deterioration of glass fiber-polymer matrix bond strengths in dental fiber-reinforced composites during hydrothermal and mechanical aging. Conventional three-point bending tests on dental FRCs were used to assess flexural strengths and moduli. Micro push-out tests were used to measure glass fiber-polymer matrix bond strengths, and nanoindentation tests were used to determine the modulus of elasticity of fiber and polymer matrix phases separately. Bar-shaped specimens of FRCs (EverStick, StickTech, and Vectris Pontic, Ivoclar-Vivadent) were either stored at room temperature, in water (37 and 100 degrees C) or subjected to ageing (10(6) cycles, load: 49 N), then tested by three-point bending. Thin slices were prepared for micro push-outand nanoindentation tests. The ultimate flexural strengths of both FRCs were significantly reduced after aging (p < 0.05). Both water storage and mechanical loading reduced the interfacial bond strengths of glass fibers to polymer matrices. Nanoindentation tests revealed a slight reduction in the elastic modulus of the EverStick and Vectris Pontic polymer matrix after water storage. Mechanical properties of FRC materials degrade primarily by a loss of interfacial bond strength between the glass and resin phases. This degradation is detectable by micro push-out and nanoindentation methods.
机译：纤维增强复合材料（FRC）作为牙科和医学中的长期修复材料具有广阔的前景。最近的证据表明这些物质在体内降解，但机理尚不清楚。这项研究的目的是研究牙科纤维增强复合材料在水热和机械老化过程中玻璃纤维-聚合物基体粘结强度下降的机理。使用常规的牙科FRC的三点弯曲测试来评估弯曲强度和模量。微推出试验用于测量玻璃纤维-聚合物基体的粘结强度，纳米压痕测试用于分别确定纤维相和聚合物基体相的弹性模量。 FRC的棒状标本（EverStick，StickTech和Vectris Pontic，Ivoclar-Vivadent）存储在室温，水（37和100摄氏度）中，或进行老化（10（6）个循环，载荷：49 N ），然后通过三点弯曲进行测试。制备薄片用于微推出和纳米压痕测试。老化后，两种FRC的极限抗弯强度均显着降低（p <0.05）。储水和机械负荷都降低了玻璃纤维与聚合物基体的界面结合强度。纳米压痕测试表明，蓄水后EverStick和Vectris Pontic聚合物基体的弹性模量略有降低。 FRC材料的机械性能下降主要是由于玻璃相和树脂相之间的界面粘结强度降低。这种降解可以通过微推出和纳米压痕方法检测到。

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