Influence of Light-Curing Time and Increment Thickness on the Properties of Bulk Fill Composite Resins With Distinct Application Systems.

Autor: Torres CRG; Department of Restorative Dentistry, Institute of Science and Technology, Sao Paulo State University-UNESP, São José dos Campos, Brazil., Prado TP; Department of Restorative Dentistry, Institute of Science and Technology, Sao Paulo State University-UNESP, São José dos Campos, Brazil., Ávila DMDS; Department of Restorative Dentistry, Institute of Science and Technology, Sao Paulo State University-UNESP, São José dos Campos, Brazil., Pucci CR; Department of Restorative Dentistry, Institute of Science and Technology, Sao Paulo State University-UNESP, São José dos Campos, Brazil., Borges AB; Department of Restorative Dentistry, Institute of Science and Technology, Sao Paulo State University-UNESP, São José dos Campos, Brazil.
Jazyk: angličtina
Zdroj: International journal of dentistry [Int J Dent] 2024 Oct 21; Vol. 2024, pp. 2123406. Date of Electronic Publication: 2024 Oct 21 (Print Publication: 2024).
DOI: 10.1155/2024/2123406
Abstrakt: The objective of this study was to evaluate the influence of light-curing time and increment thickness on the microhardness and degree of conversion (DC) of bulk fill composite resins with different application systems. Translucency parameter (TP) was also measured. Specimens of resin composites were prepared in a circular matrix using a single increment with different thicknesses (2, 4, and 6 mm) and light-cured with distinct times (10, 20, and 40 s). The materials tested ( n  = 5 pergroup) were Filtek One (FO) bulk fill, Tetric N-Ceram (TC) bulk fill, SonicFill 3 (SF), VisCalor (VC) bulk. After 24 h, Knoop microhardness (KN) was measured, and the bottom/top ratio (B/T ratio ) was calculated. The DC was measured using Fourier transformed infrared (FTIR) spectroscopy. The TP was assessed in additional specimens with 1 mm thick ( n  = 5). The data were statistically analyzed with analysis of variance (ANOVA) and Tukey's tests (5%). Significant differences were observed for all factors, for both B/T ratio and DC ( p   < 0.05). The higher increment thickness and the lower curing times resulted in lower B/T ratio and DC means. The VC and TC resins exhibited the overall higher B/T ratio , and the highest TP. SF presented the lowest values of B/T ratio and DC, with compromised polymerization at 6 mm depth. TP (means ± SD) were FO (12.85 ± 1.0) 1 , SF (15.62 ± 0.73) 2 , TC (20.32 ± 0.49) 3 , and VC (20.53 ± 0.73) 3 . We concluded that the greater the thickness of the increment, the lower the DC. Higher light curing times resulted on increased DC of the tested composites. The higher translucent materials VC and TC showed the greater B/T ratio; and FO resin exhibited the higher DC values.
Competing Interests: The authors declare no conflicts of interest.
(Copyright © 2024 Carlos Rocha Gomes Torres et al.)
Databáze: MEDLINE
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