| Journal: | Materials research |
| Database: | PERIÓDICA |
| System number: | 000312964 |
| ISSN: | 1516-1439 |
| Authors: | Moraes, Rafael Ratto de1 Schneider, Luis Felipe Jochims Correr-Sobrinho, Lourenco Consani, Simonides Sinhoreti, Mario Alexandre Coelho |
| Institutions: | 1Universidade Estadual de Campinas, Escola de Odontologia, Piracicaba, Sao Paulo. Brasil |
| Year: | 2007 |
| Season: | Ene-Mar |
| Volumen: | 10 |
| Number: | 1 |
| Pages: | 79-81 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Nota breve o noticia |
| Approach: | Experimental |
| English abstract | This study investigated the influence of ethanol concentration on softening tests for cross-link density evaluation (microhardness) of dental composites. Specimens of Filtek Z100 (3M ESPE) were light-activated by standard or pulse-delay methods. After initial Knoop hardness readings (KHN1), half of specimens (n = 10) for each irradiation method was stored in 100% ethanol, and half in 75% ethanol, during 24 hours, and hardness was determined anew. Hardness deterioration (DKHN) was recorded as the difference between pre and post-storage values. KHN1 data were submitted to one-way ANOVA and Tukey's test (alpha = 0.05), and hardness deterioration was analyzed by two-way ANOVA and Tukey's test (alpha= 0.05). For KHN1, no significant differences were detected between the activation modes (p = 0.697). Samples light-activated by the pulse-delay method presented significantly higher softening compared to the standard mode when samples were immersed in 100% ethanol. Conversely, no significant differences between curing modes were detected for samples stored in 75% ethanol |
| Disciplines: | Ingeniería, Medicina, Química |
| Keyword: | Ingeniería de materiales, Odontología, Química de polímeros, Resinas compuestas, Tratamiento químico, Etanol, Propiedades mecánicas, Dureza |
| Keyword: | Engineering, Medicine, Chemistry, Materials engineering, Dentistry, Polymer chemistry, Composite resins, Chemical treatment, Ethanol, Mechanical properties, Hardness |
| Full text: | Texto completo (Ver HTML) |
