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Light-Curing Volumetric Shrinkage in Dimethacrylate-Based Dental Composites by Nanoindentation and PAL Study

机译:纳米压痕和PAL研究二甲基丙烯酸酯基牙科复合材料的光固化体积收缩率

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摘要

Light-curing volumetric shrinkage in dimethacrylate-based dental resin composites Dipol® is examined through comprehensive kinetics research employing nanoindentation measurements and nanoscale atomic-deficient study with lifetime spectroscopy of annihilating positrons. Photopolymerization kinetics determined through nanoindentation testing is shown to be described via single-exponential relaxation function with character time constants reaching respectively 15.0 and 18.7 s for nanohardness and elastic modulus. Atomic-deficient characteristics of composites are extracted from positron lifetime spectra parameterized employing unconstrained x3-term fitting. The tested photopolymerization kinetics can be adequately reflected in time-dependent changes observed in average positron lifetime (with 17.9 s time constant) and fractional free volume of positronium traps (with 18.6 s time constant). This correlation proves that fragmentation of free-volume positronium-trapping sites accompanied by partial positronium-to-positron traps conversion determines the light-curing volumetric shrinkage in the studied composites.
机译:通过基于纳米压痕测量的全面动力学研究和具有scale灭正电子寿命光谱的纳米级原子缺陷研究,通过全面的动力学研究,对基于二甲基丙烯酸酯的牙科树脂复合材料的光固化体积收缩进行了研究。通过纳米压痕测试确定的光聚合动力学显示为通过单指数弛豫函数描述的,其特征时间常数对于纳米硬度和弹性模量分别达到15.0和18.7s。从使用无约束x3项拟合参数化的正电子寿命谱中提取复合材料的原子不足特性。经测试的光聚合动力学可以充分反映在平均正电子寿命(具有17.9的时间常数)和自由电子分数自由体积分数(具有18.6的时间常数)中随时间变化的变化中。这种相关性证明,自由体积的正电子俘获位点的碎裂以及部分正电子向正电子的陷阱转化决定了所研究复合材料的光固化体积收缩率。

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