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首页> 外文期刊>Brazilian Journal of Oral Sciences >Radiant exposure effects on physical properties of methacrylate - and silorane-composites
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Radiant exposure effects on physical properties of methacrylate - and silorane-composites

机译：辐射暴露对甲基丙烯酸酯和硅硅烷混合物的物理性能的影响

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AIM: To evaluate the effect of different radiant exposures on the degree of conversion (DC), Knoop hardness number (KHN), plasticization (P), water sorption (WS), and solubility (S) of different monomer resin-based composites. METHODS: Circular specimens (5 x 2 mm) were manufactured from methacrylate and silorane composite resins, and light-cured at 19.8, 27.8, 39.6, and 55.6 J/cm2, using second-generation LED at 1,390 mW/cm2. After 24 h, DC was obtained using a FT-Raman spectrometer equipped with a Nd:YAG laser, KHN was measured with 50-g load for 15 s, and P was evaluated on the top and bottom surfaces by the percentage of hardness reduction after 24 h immersed in absolute alcohol. WS and S were determined according to ISO 4049. Data were subjected to statistical analysis (α=0.05). RESULTS: Methacrylate material presented higher DC, KHN, P, and WS than silorane (p0.05). There was no difference in the S values (p0.05). The increased radiant exposures improved only the KHN (p0.05). In general, top surfaces showed higher DC and KHN than bottom, for both materials (p0.05). The increase of the radiant exposure did not improve most physical properties of the composites and were monomer-base dependent. CONCLUSIONS: Chemical composition of the composite resins resulted in different physical properties behavior and could affect the clinical longevity of dental restorations, but overall these properties were not influenced by the different radiant exposures evaluated in the study.
机译：目的：评估不同辐射暴露对不同单体树脂基复合材料的转化率（DC），努氏硬度值（KHN），增塑（P），吸水率（WS）和溶解度（S）的影响。方法：使用甲基丙烯酸酯和硅硅烷复合树脂制造圆形样品（5 x 2毫米），并使用1,390 mW / cm2的第二代LED分别以19.8、27.8、39.6和55.6 J / cm2的光固化。 24小时后，使用配备Nd：YAG激光的FT拉曼光谱仪获得DC，在50 g载荷下测量KHN 15 s，并通过表面硬度降低后的百分比评估P的上下表面浸入无水酒精中24小时。 WS和S根据ISO 4049确定。对数据进行统计分析（α= 0.05）。结果：甲基丙烯酸酯材料的DC，KHN，P和WS均高于硅氧烷（p <0.05）。 S值无差异（p> 0.05）。增加的辐射暴露仅改善了KHN（p <0.05）。通常，两种材料的顶部表面都显示出比底部更高的DC和KHN（p <0.05）。辐射暴露的增加并未改善复合材料的大多数物理性能，并且是基于单体的。结论：复合树脂的化学成分导致不同的物理性能，并可能影响牙齿修复的临床寿命，但总体而言，这些性能不受研究中评估的不同辐射暴露的影响。

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