Effect of moisture protective coatings on the strength of a modern metal‐reinforced glass–ionomer cement
| Autor: | Jill Ann Williams, G J Pearson, Richard William Billington |
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| Rok vydání: | 1998 |
| Předmět: |
Cement
Materials science Moisture Glass ionomer cement Metal Solvent Coated Materials Biocompatible Flexural strength Glass Ionomer Cements Tensile Strength visual_art Materials Testing Ultimate tensile strength Wettability visual_art.visual_art_medium Wetting Composite material Pliability General Dentistry Cermet Cements |
| Zdroj: | Journal of Oral Rehabilitation. 25:535-540 |
| ISSN: | 1365-2842 0305-182X |
| Popis: | The strength of a modern, low metal:glass ratio, metal-reinforced glass-ionomer cement was measured evaluating a number of protective barriers: one light-cured resin, two solvent-based dental varnishes and petroleum jelly. The cement was exposed to water at 10 and 60 min from start of mix. The results obtained with these protecting agents were compared with those obtained where no protection was applied. A comparison of uniaxial flexural strength and biaxial flexural strength showed the latter to be more discriminating. Proprietary dental varnishes were superior to petroleum jelly, producing similar strengths of 50 MPa. Petroleum jelly was, however, preferable to no protection. Moisture protection during the first 30 min was found to be beneficial, thereafter no further strength increase was found. A second material, a cement which has a high metal:glass ratio, was found to be more moisture resistant but weaker in strength than the modern material, with a biaxial strength of 39 MPa. |
| Databáze: | OpenAIRE |
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