Influence of additional polymerization on the microhardness of direct composites for indirect use: in vitro study
DOI:
https://doi.org/10.5902/2179460X40499Keywords:
Composite Resins, Additional polymerization, MicrohardnessAbstract
The aim of this study was to verify the effect of additional polymerization with microwave and autoclave on the microhardness of 3 different commercial brands of composite resin compared to the ceromere. Cylindrical specimens (6mm x 3mm) were made with a split matrix divided into 10 groups of 13 bodies, with: Photoactivation (LED light on the top surface-40s; photoactivation LED + microwave (500W per 3min) immersed in 100ml distilled water and Photoactivation LED + autoclave (full cycle). The Ceromere group was activated according to the manufacturer's recommendation. The specimens went through a finishing and polishing sequence being stored with a cotton moistened in distilled water for 24h. They were taken to the microhardness meter (three dentations, 50g/15s load). The analysis of variance (ANOVA) was performed with post hoc Games Howell at a level of 5%. It was verified that the ceromere did not differ from the groups Z250 photo and microwave, but was inferior to the Z250 group with autoclave, and the microhardness of this was higher than the other groups. The Tetric group was inferior to all other groups. It was concluded that the additional polymerization methods promoted an increase of the superficial microhardness of the Z250 resin and this did not present a difference of microhardness when compared to the Ceromere
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