Effects of 6 Months of Aging in Water on Hardness and Surface Roughness of Two Microhybrid Dental Composites

Moraes, Rafael R.; Marimon, José Laurindo Machado; Schneider, Luís Felipe Jochims; Sinhoreti, Mário Alexandre Coelho; Correr-Sobrinho, Lourenço; Bueno, Márcia

doi:10.1111/j.1532-849x.2007.00295.x

Cited by 66 publications

(69 citation statements)

References 25 publications

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“…When immersed in artificial saliva, all tested dental composites showed no difference between initial and 30 days period. The results of this study are in agreement with other studies 28) , which reported no statistically significant difference in the surface roughness values of composite resins between initial and 180 days of immersion periods in distilled water. Low pH and alcohol may affect the surface integrity of composite resins.…”

Section: Discussionsupporting

confidence: 83%

“…Thus it is more susceptible to surface degradation due the low pH and the high presence of alcohol in whisky. The chemical degradation acts also on resin matrix due to the heterogeneous polymerization process of the methacrylate-based monomers 28) . Moreover, the low pH of a solution causes damage to the mechanical performance of composite resins.…”

Section: Discussionmentioning

confidence: 99%

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Effect of alcoholic beverages on surface roughness and microhardness of dental composites

Silva

Vitti

Sinhoreti

et al. 2016

Dental Materials Journal

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The aim of this study was to evaluate the microhardness and surface roughness of composite resins immersed in alcoholic beverages. Three composite resins were used: Durafill (Heraeus Kulzer), Z250 (3M-ESPE) and Z350 XT (3M-ESPE). The inital surface roughness and microhardness were measured. The samples were divided into four groups (n=30): G1-artificial saliva; G2-beer; G3-vodka; G4-whisky. The samples were immersed in the beverages 3× a day for 15 min and 30 days. The surface roughness and microhardness assays were repeated after immersion period. The data were statistically analyzed by two-way ANOVA and Tukey-HSD test (p<0.05). Surface roughness increased for all composite resins immersed in beer and whisky. Microhardness of all groups decreased after immersion in alcoholic beverages. The effect of these beverages on dental composites is depended upon the chemical composition, immersion time, alcohol content and pH of solutions.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Effect of alcoholic beverages on surface roughness and microhardness of dental composites

Silva

Vitti

Sinhoreti

et al. 2016

Dental Materials Journal

Self Cite

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“…This was probably a result of increased interaction -by virtue of increased contact time-between the immersion solutions and resin materials, leading to greater water uptake and higher erosive impact of the acidic conditions on the materials. As reported by Moraes et al 35) , storage for extended time periods in aqueous media are detrimental to the composite surface. Therefore, progressive degradation over a 6-month storage period altered the microstructures of the restorative materials, such that the inorganic particles were no longer provided with a stable structure, predisposing them to filler dislodgment and elution 35) .…”

Section: Discussionmentioning

confidence: 92%

“…As reported by Moraes et al 35) , storage for extended time periods in aqueous media are detrimental to the composite surface. Therefore, progressive degradation over a 6-month storage period altered the microstructures of the restorative materials, such that the inorganic particles were no longer provided with a stable structure, predisposing them to filler dislodgment and elution 35) . The tested restorative materials contained barium glass, silica, and zirconia/ silica fillers.…”

Section: Discussionmentioning

confidence: 92%

Surface hardness of different restorative materials after long-term immersion in sports and energy drinks

et al. 2012

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The purpose of this study was to evaluate the effect of sports and energy drinks on the surface hardness of different restorative materials over a 6-month period. Forty-two disk-shaped specimens were prepared for each of the four restorative materials tested: Compoglass F, Filtek Z250, Filtek Supreme, and Premise. Specimens were immersed for 2 min daily, up to 6 months, in six storage solutions (n=7 per material for each solution): distilled water, Powerade, Gatorade, X-IR, Burn, and Red Bull. Surface hardness was measured at baseline, after 1 week, 1 month, and 6 months. Data were analyzed statistically using repeated measures ANOVA followed by the Bonferroni test for multiple comparisons (α=0.05). Surface hardness of the restorative materials was significantly affected by both immersion solution and immersion period (p<0.001). All tested solutions induced significant reduction in surface hardness of the restorative materials over a 6-month immersion period.

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“…Various other studies have also determined alterations of composite restorative materials by measuring changes in microhardness 14,18,19) . Besides measuring changes in the micohardness, other mechanical properties of resin based materials could also be tested, such as: flexural strength 20) , surface roughness 21) and fracture toughness 22) . The results of the present study indicate that the alterations due to NaOCl contact of the build-up composites are a superficial phenomenon.…”

Section: Discussionmentioning

confidence: 99%

Effect of sodium hypochlorite contamination on microhardness of dental core build-up materials

2010

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This study aimed to determine the influence of sodium hypochlorite (NaOCl) contamination on the microhardness of build-up composites. Fifty-two samples, from each of three build-up materials (LuxaCore Dual, MultiCore flow and Rebilda DC) were prepared. Half of the samples from each material were stored in physiologic saline (baseline control) while the other halves were stored in NaOCl. After 1 h, the samples were rinsed with tap water, cut axially and measured for Knoop hardness at different depth levels. The results were analysed by ANOVA and unpaired t-tests (p<0.05). Significant differences in microhardness were observed for LuxaCore Dual up to 0.2 mm, Rebilda DC up to 0.3 mm, and for MultiCore flow up to 0.4 mm under the surface level. Contact with sodium hypochlorite on build-up materials causes reduction of the microhardness. The softening is not only limited on the surface, but can also be found in deeper layers of build-up materials.

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Effects of 6 Months of Aging in Water on Hardness and Surface Roughness of Two Microhybrid Dental Composites

Cited by 66 publications

References 25 publications

Effect of alcoholic beverages on surface roughness and microhardness of dental composites

Effect of alcoholic beverages on surface roughness and microhardness of dental composites

Surface hardness of different restorative materials after long-term immersion in sports and energy drinks

Effect of sodium hypochlorite contamination on microhardness of dental core build-up materials

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