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- Title
Micro-computed tomography evaluation of volumetric polymerization shrinkage and degree of conversion of composites cured by various light power outputs.
- Authors
ATRIA, Pablo J.; SAMPAIO, Camila S.; CÁCERES, Eduardo; FERNÁNDEZ, Jessica; REIS, Andre F.; GIANNINI, Marcelo; COELHO, Paulo G.; HIRATA, Ronaldo
- 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.
- Subjects
FOURIER transform infrared spectroscopy; DEGREE of polymerization; TOMOGRAPHY; TWO-way analysis of variance
- Publication
Dental Materials Journal, 2018, Vol 37, Issue 1, p33
- ISSN
0287-4547
- Publication type
Article
- DOI
10.4012/dmj.2016-430