| Revue: | Materials research |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000312757 |
| ISSN: | 1516-1439 |
| Autores: | Tirapelli, Camila1 Panzeri, Fernanda de Carvalho Panzeri, Heitor Pardini, Luiz Carlos Zaniquelli, Osvaldo |
| Instituciones: | 1Universidade de Sao Paulo, Faculdade de Odontologia, Ribeirao Preto, Sao Paulo. Brasil |
| Año: | 2004 |
| Periodo: | Jul-Sep |
| Volumen: | 7 |
| Número: | 3 |
| Paginación: | 409-412 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Nota breve o noticia |
| Enfoque: | Experimental |
| Resumen en inglés | This study observed alteration in the radiopacity and microhardness of expired resin-based materials compared to non-expired materials and the operating characteristics of the X-ray source used. Five 2 mm-thick cured specimens were prepared for each material: composite resins (P60®, Z100®), and a compomer (Dyract AP®). Radiopacity of the specimens was evaluated comparing the density of the resin-based material to an equivalent (mm) density of a 99.5% pure aluminum step wedge using a transmission densitometer. Surface microhardness measurements were carried out using a calibrated Vickers indenter on three different points of the same surface. ANOVA and Tukey tests (pre-set alpha = 0.05) revealed that expired materials showed no significant change in radiopacity. One material (Filtek P60) demonstrated lower radiopacity with lower KVp. Change in microhardness wa s statistically significant for Z100: for this material, the microhardness after expiration was significantly lower than before the expiration date |
| Disciplinas: | Medicina, Ingeniería |
| Palabras clave: | Odontología, Ingeniería de materiales, Ingeniería mecánica, Resinas compuestas, Radiopacidad, Dureza |
| Keyword: | Medicine, Engineering, Dentistry, Materials engineering, Mechanical engineering, Composite resins, Radiopacity, Hardness |
| Texte intégral: | Texto completo (Ver HTML) |
