Compressive strength of dental composites photo-activated with different light tips
| Autor: | Edson Alves de Campos, Vanderlei Salvador Bagnato, Sergei Godeiro Fernandes Rabelo Caldas, Marília Regalado Galvão, A. N. S. Rastelli, Marcelo Ferrarezi de Andrade, Saturnino Calabrez-Filho |
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| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
Optical fiber Materials science business.industry Composite number Statistical difference Polymer Condensed Matter Physics Load cell RESINAS COMPOSTAS Industrial and Manufacturing Engineering Atomic and Molecular Physics and Optics law.invention Compressive strength chemistry law Posterior teeth Photonics Composite material business Instrumentation |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 1555-6611 1054-660X |
| DOI: | 10.1088/1054-660x/23/4/045604 |
| Popis: | The aim of this study was to evaluate the compressive strength of microhybrid (FiltekTM Z250) and nanofilled (FiltekTM Supreme XT) composite resins photo-activated with two different light guide tips, fiber optic and polymer, coupled with one LED. The power density was 653 mW cm−2 when using the fiber optic light tip and 596 mW cm−2 with the polymer. After storage in distilled water at 37 ± 2 "C for seven days, the samples were subjected to mechanical testing of compressive strength in an EMIC universal mechanical testing machine with a load cell of 5 kN and speed of 0.5 mm min−1. The statistical analysis was performed using ANOVA with a confidence interval of 95% and Tamhane’s test. The results showed that the mean values of compressive strength were not influenced by the different light tips (p > 0.05). However, a statistical difference was observed (p < 0.001) between the microhybrid composite resin photo-activated with the fiber optic light tip and the nanofilled composite resin. Based on these results, it can be concluded that microhybrid composite resin photo-activated with the fiber optic light tip showed better results than nanofilled, regardless of the tip used, and the type of the light tip did not influence the compressive strength of either composite. Thus, the presented results suggest that both the fiber optic and polymer light guide tips provide adequate compressive strength to be used to make restorations. However, the fiber optic light tip associated with microhybrid composite resin may be an interesting option for restorations mainly in posterior teeth. |
| Databáze: | OpenAIRE |
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