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Effect of food/oral-simulating liquids on dynamic mechanical thermal properties of dental nanohybrid light-cured resin composites

机译:食品/口水模拟液对牙科纳米混合光固化树脂复合材料动态力学热性能的影响

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Objective. The purpose of this work was the study of the effect of food/oral simulating liquids on the dynamic mechanical thermal properties (viscoelastic properties) of current commercial dental light-cured resin composites characterized as nanohybrids. These nanohybrids were Grandio, Protofill-nano and Tetric EvoCeram. Methods. The properties were determined under dry conditions (1 h at 37 ℃ afterlight-curing) and also after storage in dry air, distilled water, artificial saliva SAGF~® or ethanol/water solution (75vol%) at 37 ℃ for up 1, 7, 30 or 90 days. Dynamic mechanical thermal analysis tests were performed on a Diamond Dynamic Mechanical Analyzer in bending mode. A frequency of 1 Hz and a temperature range of 25-185 ℃ were applied, while the heating rate of 2℃/min was selected to cover mouth temperature and the materials' likely T_g. Results. Storage modulus, loss modulus and tangent delta were plotted against temperature over this period. The T_g of composites was obtained as the temperature indicated by tanδ peak. Moreover, the maximum height of tans peak, the width at the half of tana maximum and a parameter known as "ζ" parameter were determined. All composites analyzed 1 h after light-curing and 1 day in air or in food/oral simulating liquids showed two T_g. All composites stored for 7, 30 or 90 days in any medium showed unique T_g value. Also among the various properties studied the most sensible in the structural changes of composites seems to be the T_g. Significance. Storage of composites in dry air at 37 ℃ which is very close to their T_g (40 ℃) for 1 or 7 days caused post curing reactions, while storage for 30 or 90 days has no further effect on composites. Storage in water or artificial saliva 37 ℃ for 1 or 7 days caused post curing reactions, while storage for 30 or 90 days seems to cause plasticization effect affecting some parameters analogously. Storage in ethanol/water solution (75vol%) 37 ℃ for 1 or 7 days caused also post curing reactions, while storage for 30 or 90 days caused plasticization and/or probable oxidation/hydrolysis of polymeric network.
机译:目的。这项工作的目的是研究食品/口用模拟液体对目前表征为纳米杂化物的商用牙科光固化树脂复合材料的动态机械热性能(粘弹性)的影响。这些纳米杂交物是Grandio,Protofill-nano和Tetric EvoCeram。方法。在干燥条件下(光固化后在37℃下1 h),以及在干燥空气,蒸馏水,人造唾液SAGF〜®或乙醇/水溶液(75vol%)在37℃下储存1、7后,测定性能。 ,30或90天。动态力学热分析测试是在Diamond Dynamic Mechanical Analyzer上以弯曲模式进行的。施加1 Hz的频率和25-185℃的温度范围,同时选择2℃/ min的加热速率以覆盖口腔温度和材料的可能T_g。结果。在此期间,将储能模量,损耗模量和切线增量相对于温度作图。得到的复合材料的T_g为由tanδ峰表示的温度。此外,确定了tans峰的最大高度,塔那峰最大值的一半的宽度和称为“ζ”参数的参数。在光固化后1 h和在空气中或在食品/口腔模拟液体中1天分析的所有复合材料均显示出两个T_g。在任何介质中储存7、30或90天的所有复合材料均显示出独特的T_g值。在研究的各种特性中,复合材料的结构变化最明显的似乎是T_g。意义。复合材料在干燥温度为37℃,非常接近其T_g(40℃)的干燥空气中存储1或7天会引起固化后反应,而在30或90天的存储中对复合材料没有进一步影响。在37℃的水或人造唾液中储存1或7天会引起固化后反应,而在30或90天的储存似乎会引起增塑作用,类似地影响某些参数。在37℃的乙醇/水溶液(75vol%)中储存1或7天也会引起后固化反应,而在30或90天中储存会引起聚合物网络的增塑和/或可能的氧化/水解。

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