Viscoelastic stability of resin-composites aged in food-simulating solvents
| Autor: | Hanadi Y. Marghalani, David C. Watts |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Dental Stress Analysis
Materials science Organically Modified Ceramics Siloxanes Surface Properties Resin composite Composite Resins Viscoelasticity Intermediate group Dental Materials Materials Testing Pressure Humans General Materials Science Composite material General Dentistry Ethanol Viscosity Temperature Water Butanones Elasticity Solvent Compressive strength Creep Food Mechanics of Materials Tetric ceram Solvents Methacrylates Stress Mechanical Deformation (engineering) |
| Zdroj: | Dental Materials. 29:963-970 |
| ISSN: | 0109-5641 |
| DOI: | 10.1016/j.dental.2013.07.009 |
| Popis: | To study time-dependent viscoelastic deformation (creep and recovery) of resin-composites, after conditioning in food-simulating solvents, under a compressive stress at 37°C.Five dimethacrylate-based composites: (Spectrum TPH, Premise Body, Tetric Ceram HB, Filtek P60, X-tra fil), and two Ormocers (Experimental Ormocer V 28407, Admira) were studied. Three groups of cylindrical specimens (4mm×6mm) were prepared and then conditioned in 3 solvents: methyl ethyl ketone (MEK), ethanol, and water for 1 month at 37°C. The compressive creep-strain under 35MPa in 37°C water was recorded continuously for 2h and then the unloaded recovery-strain was monitored for another 2h. The data were analyzed by one-way ANOVA and Bonferroni's test.The materials all exhibited classic creep and recovery curves, with most parameters being significantly different (p0.0001) for each solvent condition. All materials showed lower creep-strain in water than in ethanol or MEK solvents. Maximum creep-strain and permanent-set gave negative linear-regression (r(2)0.98) with logarithm of the solvent solubility-parameter. The % mean (SD) creep-strain ranged from a minimum of 0.82 (0.01) for the Exp. Ormocer in water to the maximum of 4.19 (0.30) for Admira in MEK. Similar trends were found for permanent-set. The dimethacrylate-based composites behaved as an intermediate group, apart from X-tra fil that had similar stability to the Exp. Ormocer.The viscoelastic stability (low creep and permanent-set) of the Exp. Ormocer, compared to many dimethacrylate-based composites, in food-simulating solvents may be due to its diluent-free formulation. This was closely matched by a highly-filled dimethacrylate material (X-tra fil). |
| Databáze: | OpenAIRE |
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