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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

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

Bibliographical note

Funding Information:
The authors thank Ivoclar Vivadent for supplying materials, and Coordination for the Improvement of Higher Education Personnel (Capes-Grant # 1777-2014)

Publisher Copyright:
© 2018, Japanese Society for Dental Materials and Devices. All rights reserved.

Keywords

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

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