Micro-computed tomography evaluation of volumetric polymerization shrinkage and degree of conversion of composites cured by various light power outputs

Pablo J. Atria, Camila S. Sampaio, Eduardo Cáceres, Jessica Fernández, Andre F. Reis, Marcelo Giannini, Paulo G. Coelho, Ronaldo Hirata

Research output: Contribution to journalArticle

Abstract

This study evaluated the influence of different light-curing modes on the volumetric polymerization shrinkage and degree of conversion of a composite resin at different locations using micro-computed tomography and Fourier transform infrared spectroscopy (FTIR). Specimens were divided into 4 groups based on the light-curing mode used (Bluephase 20i): 1 —High (1,200 mW/cm2); 2 —Low (650 mW/cm2); 3 —Soft-start (650–1,200 mW/cm2); and 4 —Turbo (2,000 mW/cm2). Degree of conversion was calculated by the measurement of the peak absorbance height of the uncured and cured materials at the specific wavenumbers, and was performed by FTIR 48 h after curing resin samples. Degree of conversion was analyzed using two-way ANOVA. No significant differences were observed independent of the region of the restoration investigated (p>0.05). Different curing modes did not influence volumetric shrinkage neither degree of conversion of class I composite resin restorations.

Original languageEnglish (US)
Pages (from-to)33-39
Number of pages7
JournalDental Materials Journal
Volume37
Issue number1
DOIs
StatePublished - Jan 1 2018

Keywords

  • Composite
  • Computed-tomography
  • Light-curing
  • Polymerization
  • Shrinkage

ASJC Scopus subject areas

  • Ceramics and Composites
  • Dentistry(all)

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