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The Scientific World Journal
Volume 2015, Article ID 298575, 7 pages
Research Article

Effect of a CO2 Laser on the Inhibition of Root Surface Caries Adjacent to Restorations of Glass Ionomer Cement or Composite Resin: An In Vitro Study

1School of Dentistry, Cruzeiro do Sul University (UNICSUL), Avenida Doutor Ussiel Cirilo 225, 08060-070 São Paulo, SP, Brazil
2Department of Pediatric Dentistry, Faculty of Dentistry of Piracicaba, State University of Campinas (UNICAMP), Avenida Limeira 901, P.O. Box 52, 13414-903 Piracicaba, SP, Brazil
3Department of Restorative Dentistry, School of Dentistry, University of São Paulo (USP), Avenida Professor Lineu Prestes 2227, Cidade Universitária, 05508-900 São Paulo, SP, Brazil

Received 1 June 2015; Accepted 3 August 2015

Academic Editor: Samir Nammour

Copyright © 2015 L. C. Daniel et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This study investigated the effect of CO2 laser irradiation on the inhibition of secondary caries on root surfaces adjacent to glass ionomer cement (GIC) or composite resin (CR) restorations. 40 dental blocks were divided into 4 groups: G1 (negative control): cavity preparation + adhesive restoration with CR; G2: (positive control) cavity preparation + GIC restoration; G3: equal to group 1 + CO2 laser with 6 J/cm2; G4: equal to group 2 + CO2 laser. The blocks were submitted to thermal and pH cycling. Dental demineralization around restorations was quantified using microhardness analyses and Light-Induced Fluorescence (QLF). The groups showed no significant differences in mineral loss at depths between 20 μm and 40 μm. At 60 μm, G2 and G3 ≠ G1, but G4 = G1, G2 and G3. At 80 μm, G4 ≠ G1, and at 100 μm, G4 = G2 = G1. At 140 and 220 μm, G2, G3, and G4 = G1. The averages obtained using QFL in groups 1, 2, 3, and 4 were 0.637, 0.162, 0.095, and 0.048, respectively. QLF and microhardness analyses showed that CO2 laser irradiation reduced mineral loss around the CR restorations but that it did not increase the anticariogenic effect of GIC restorations.