Aims: To evaluate the effect of the different curing methods conventional water bath heat-curing and microwave energy curing method and different immersion periods on the water sorption and solubility of the different types of heat-cured acrylic resins. Materials and methods: Water sorption and solubility were measured by means of mass change in the materials after water saturation and dehydration. Two different commercial heat-cured acrylic resins Major Base 2, and Quayle Dental resins were used in this study. Specimens were divided into two groups depending on the curing method. Thirty two specimens were prepared, eight specimens for each material in each group. Specimens were immersed in distilled water, and then subsequently removed from their containers at 1 week and 1 month of immersion for evaluation. Mean values wear compared statistically with one way analysis of variance followed by Duncan's multiple range test to determined the significant different among the groups at (p< 0.05) level of significance. Results: showed that the curing method and immersion period have a significant effect on the water sorption and solubility ratios of the resins. Curing by microwave energy method and increasing immersion period caused increasing in the ratios. The type of heat-cured acrylic resin has an effect but the difference was not significant. Conclusion: the curing method, immersion period and types of the acrylic resin have an effect on the absorption and solubility ratios.
The aim of the present research was to study the percentage water sorption and solubility of Esthet composite resin based on an ethoxylated bisphenol A glycol dimethacrylate (Bis-EMA) and Heliomolar composite resin based on bisphenol A glycol dimethacrylate (Bis-GMA). Six specimens were prepared for each material using aluminum disc 15 mm in diameter and 1 mm in thickness between two glass slides; then they were light cured for 80 seconds on each side. Percentage water sorption and solubility were measured after one week and one month. The results showed that water sorption after 1 week for Esthet composite and Heliomolar composite were 0.433 and 1.12, respectively and solubility were 0.074 and 1.066, respectively; while water sorption after 1 month were 0.517 and 2.57, respectively and solubility were 0.176 and 2.689, respectively. It could be concluded that the percentage sorption and solubility of composite based on Bis-EMA were significantly lower than that based on Bis-GMA.
Aims: To evaluate the effect of two prepared and commercial solution on surface roughness and tensile strength of highly impact acrylic denture base material. Materials and Methods: The total number of specimens were one hundred and fifty. They were prepared from highly impact acrylic and subdivided into five groups for each solution (EDTA, Soda+HR 2 ROR 2 R, Lacalut, Corega and distilled water). Two laboratory tests were used for this research. Surface Roughness and tensile strength test. The surface roughness test specimens were constructed with dimensions (10×10×2±0.03mm) (length, width, and thickness respectively). According to ADA specification no.12 the tensile test specimens were constructed with dimensions 90×10×3±0.03mm (length, width, and thickness respectively). The immersion periods in this research are (2day, 7 day and one month). ANOVA and Duncan multiple range test were used. The statistical results were considered significant at p ≤ 0.05. Results: the results showed that (soda+HR 2 ROR 2 R) has no significant change on the surface roughness and tensile strength of highly impact acrylic denture base material in (2day, 7 day, and 1month). Conclusion: (soda+HR 2 ROR 2 R) has the lowest effect on the surface roughness and tensile strength of highly impact acrylic denture base material in (2day, 7 day, and 1month)
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