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Matéria (Rio de Janeiro)

On-line version ISSN 1517-7076

Abstract

FELIPE, Willian Fernando et al. Polymerization depths of conventional and bulk fill composites photoactivated by different methods. Matéria (Rio J.) [online]. 2020, vol.25, n.3, e-12824.  Epub Sep 16, 2020. ISSN 1517-7076.  https://doi.org/10.1590/s1517-707620200003.1124.

The aim of this study was to evaluate the depth of cure of conventional (Filtek Z350 and Esthet-X HD) and bulk fill resins composites (Filtek bulk fill flow and SDR) using different photoactivation methods. Samples were made using five disc-shaped matrices (1 mm high and 8 mm central diameter) with interposed polyester strips. The samples were photoactivated using different methods [continuous high-irradiance light (LCA), continuous low-irradiance light (LCB), and soft-start (SS)], maintaining 24 J/cm2 radiant exposure. After 24h, Knoop microhardness test was performed at 5 depths (surface, 1 mm, 2 mm, 3 mm and 4 mm). The Knoop microhardness were analyzed by ANOVA two-way and Tukey’s test (5%). Conventional resins presented the highest results up to 2 mm depth, except for Esthet-X photoactived by LCB, which showed significant lower Knoop hardness from 2 mm depth. Bulk fill resins photoactivated with LCA and SS had the highest results in 4 mm depth. The LCA and SS photoactivation methods produce suitable photoactivation in conventional composites up to 2 mm and bulk fill up to 4 mm depth and the bulk fill composites present higher polymerization depth than conventional composites.

Keywords : Dental curing lights; hardness test; photoactivation; polymerization; resin.

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