Effect of Mechanical Loads and Surface Roughness on Wear of Silorane and Methacrylate-Based Posterior Composites
Author(s):
Abstract:
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 (Rₔ) 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 Results
Higher mechanical load resulted in greater weight loss (PConclusions
Results showed that wear of posterior composite restorations depends on mechanical load, type of composite resin and surface properties.Language:
English
Published:
Frontiers in Dentistry, Volume:13 Issue: 6, Nov 2016
Pages:
407 to 414
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