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.
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/cm(2); 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.
School of Dentistry, Cruzeiro do Sul University (UNICSUL), Avenida Doutor Ussiel Cirilo 225, 08060-070 São Paulo, SP, Brazil.
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Daniel
School of Dentistry, Cruzeiro do Sul University (UNICSUL), Avenida Doutor Ussiel Cirilo 225, 08060-070 São Paulo, SP, Brazil.
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Araújo
Department 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.
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Zancopé
Department of Restorative Dentistry, School of Dentistry, University of São Paulo (USP), Avenida Professor Lineu Prestes 2227, Cidade Universitária, 05508-900 São Paulo, SP, Brazil.
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Hanashiro
Department 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.
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Nobre-dos-Santos
School of Dentistry, Cruzeiro do Sul University (UNICSUL), Avenida Doutor Ussiel Cirilo 225, 08060-070 São Paulo, SP, Brazil ; Department of Restorative Dentistry, School of Dentistry, University of São Paulo (USP), Avenida Professor Lineu Prestes 2227, Cidade Universitária, 05508-900 São Paulo, SP, Brazil.
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Youssef
School of Dentistry, Cruzeiro do Sul University (UNICSUL), Avenida Doutor Ussiel Cirilo 225, 08060-070 São Paulo, SP, Brazil.
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Souza-Zaroni
D003188:Composite Resins; D003731:Dental Caries / Q000601:surgery*; D058250:Dental Restoration Repair; D005899:Glass Ionomer Cements; D006801:Humans; D054020:Lasers, Gas; D016896:Treatment Outcome
D003188:Composite Resins; D005899:Glass Ionomer Cements