机械载荷和表面粗糙度对硅烷和甲基丙烯酸酯基复合材料磨损的影响。

Masomeh Hasani Tabatabaei, Sakineh Arami, Farnaz Farahat
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引用次数: 0

摘要

目的:牙体复合磨损是一个值得关注的问题,它受多种因素的影响。研究了抛光和机械载荷对硅烷基复合树脂和甲基丙烯酸甲酯基复合树脂磨损的影响。材料和方法:每种牙科复合材料(Filtek P90和Filtek P60),在聚乙烯模具(直径4mm,高度10mm)中制作40个样品。根据整理和/或抛光方案(180或2500粒度碳化硅纸),每种复合材料的样品被分为两组。表面粗糙度(R)用接触式轮廓仪测量和记录。每个样品的重量也以克为单位进行测量。在两种不同载荷(70N, 150N)下,在销盘装置中进行磨损试验。之后,对样品进行轮廓测量,并再次测量其重量。数据分析采用t检验和单因素方差分析。结论:后路复合修复体的磨损与机械载荷、复合树脂类型和表面性能有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of Mechanical Loads and Surface Roughness on Wear of Silorane and Methacrylate-Based Posterior Composites.

Effect of Mechanical Loads and Surface Roughness on Wear of Silorane and Methacrylate-Based Posterior Composites.

Objectives: Dental composite wear in posterior restorations is a concern and is affected by different factors. This study was conducted to evaluate the effect of polishing and mechanical loads on wear of silorane-based and methyl methacrylate-based composites resins.

Materials and methods: Of each dental composite (Filtek P90 and Filtek P60), 40 samples were fabricated in a polyethylene mold (4mm diameter, 10mm height). According to the finishing and/or polishing protocols (180-grit or 2500-grit silicon carbide papers), the samples of each composite were divided into two groups. Surface roughness (R ә ) was measured and recorded using a contact profilometer. The weight of each sample was also measured in grams. The wear test was performed in a pin-on-disc device under two different loads (70N, 150N). Afterwards, samples were subjected to profilometry and their weight was measured again. Data were analyzed using t-test and univariate ANOVA. P <0.05 was considered statistically significant.

Results: Higher mechanical load resulted in greater weight loss (P<0.001). Samples polished with 2500-grit papers showed significantly lower Ra changes compared to those polished with 180-grit papers (P<0.001). Filtek P90 had greater weight loss than Filtek P60 except in one condition (180-grit, 70N).

Conclusions: Results showed that wear of posterior composite restorations depends on mechanical load, type of composite resin and surface properties.

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