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Evaluation of surface microhardness and wear resistance of two dental glass ionomer cements after radiation heat treatment

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Document pages: 8 pages

Abstract: The purpose of this study was to evaluate the effect of radiation heat treatment with dental LED device on surface microhardness and wear resistance after simulating brushing of two traditional GIC materials. In this study, two conventional GIC materials: Ketamine without aplicap and ionized star molar were studied. Prepare 20 disc-shaped specimens (mm) for each GIC (7) × 2   mm) use cylindrical PTFE mold. The first group placed the sample in the mold without any treatment, while the second group irradiated the sample for 60 minutes after placing the sample in the mold   using LED light curing device on the top surface. A commercial electric toothbrush is used for tooth brushing simulation, which is fixed in a constructed device that allows the brush headbe aligned parallel to the surface of the specimens and to control the pressure, with the following parameters: load of the toothbrush standardized at 250 g, medium hardness toothbrush head, and rotation sense changing every 30 sec. The toothbrush abrasion test mechanism, based on a 1.25-Hz frequency for 10,000 cycles, was equivalent to 800 days (~2 years) of brushing. Surface hardness, surface roughness, and surface loss after abrasive procedure were evaluated using Vickers method and Vertical Scanning Interferometry. Data were statistically analyzed using one-way ANOVA and Tukey’s post hoc test . The radiant heat treatment increased the surface microhardness and decreased surface roughness and surface loss after abrasive procedures of both the tested GIC materials but to different extent. Between the tested GIC materials there were significant differences in their tested properties ().

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