Effect of light curing modes and ethanol immersion media on the susceptibility of a microhybrid composite resin to staining

Authors

  • Flávio Henrique Baggio Aguiar Campinas State University; Piracicaba School of Dentistry; Department of Restorative Dentistry
  • Thalita Regina Vieira e Oliveira Campinas State University; Piracicaba School of Dentistry; Department of Restorative Dentistry
  • Débora Alves Nunes Leite Lima Campinas State University; Piracicaba School of Dentistry; Department of Restorative Dentistry
  • Luis Alexandre Maffei Sartini Paulillo Campinas State University; Piracicaba School of Dentistry; Department of Restorative Dentistry
  • José Roberto Lovadino Campinas State University; Piracicaba School of Dentistry; Department of Restorative Dentistry

DOI:

https://doi.org/10.1590/S1678-77572007000200006

Keywords:

Light-curing modes, Composite resins, Staining, Storage media

Abstract

The aim of this in vitro study was to evaluate the susceptibility of a hybrid composite resin (Filtek Z250 - 3M ESPE) to staining, when light cured in four different modes and immersed in two different media. Composite resin specimens were randomly prepared and polymerized according to the experimental groups (conventional - 550 mW/cm² / 30 seconds; soft start - 300mW/cm² / 10 seconds + 550 mW/cm² / 20 seconds; high intensity - 1060 mW/cm² - 10 seconds; pulse delay - 550 mW/cm² - 1 seconds + 60 seconds of waiting time + 550 mW/cm² - 20 seconds) and immersed in one of two media (distilled water or absolute ethanol) for 24h. Next, the specimens were immersed in a 2% methylene blue solution for 12 hours. Afterwards, the specimens were washed and prepared for the spectrophotometric analysis. For statistical analysis, two-way ANOVA (4X2) and Tukey's test were performed on the data at 0.05 confidence level. Soft start showed the least staining, and was statistically different from the high intensity and pulse delay light curing modes (p<0.05). Conventional light curing unit did not show statistically significant differences from any other groups (p>;0.05). There were no significant differences between the two immersion media (p>;0.05). The soft start polymerization mode showed lower susceptibly of the composite resin to staining than high intensity and pulse delay, irrespective of the immersion medium.

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Published

2007-04-01

Issue

Section

Original Articles

How to Cite

Effect of light curing modes and ethanol immersion media on the susceptibility of a microhybrid composite resin to staining . (2007). Journal of Applied Oral Science, 15(2), 105-109. https://doi.org/10.1590/S1678-77572007000200006