title: Influence of etching with erbium, chromium:yttrium-scandium-gallium-garnet laser on microleakage of class V restoration.
abstract: The aim of this in vitro study was to evaluate some parameters of dental etching when irradiated with an erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser. One-hundred sound human third molars were selected and randomly distributed into ten groups (n = 10). The class V cavities of group 1 (control) were prepared with a bur and etched with 37% phosphoric acid, while groups G2 to G10, were prepared with laser (5 W, 88.46 J/cm(2), 90/70% air/water) and etched with the following powers: G3 and G4, 0.25 W; G5 and G6, 0.5 W; G7 and G8, 0.75 W; G9 and G10, 1 W. Group G2 received no laser etching. Prior to restoration, G2, G4, G6, G8 and G10 received acid etching. After restoration, all samples were submitted to a microleakage test. According to statistical analysis (Kruskal-Wallis and Dunn's tests), G10 presented the lowest microleakage values (P<0.05). The other groups showed no differences between them. Etching with Er,Cr:YSGG laser (1 W) followed by phosphoric acid was effective in reducing the microleakage of class V restorations.
authors.affiliation: Department of Prosthodontics, School of Dentistry, University of São Paulo, São Paulo 05508-000, SP, Brazil. marotti@usp.br
authors.forename: Juliana
authors.initials: J
authors.lastname: Marotti
authors.forename: Vinícius Rangel
authors.initials: VR
authors.lastname: Geraldo-Martins
authors.forename: Marina Stella
authors.initials: MS
authors.lastname: Bello-Silva
authors.forename: Carlos
authors.initials: C
authors.lastname: de Paula Eduardo
authors.forename: Christian
authors.initials: C
authors.lastname: Apel
authors.forename: Norbert
authors.initials: N
authors.lastname: Gutknecht
mesh_terms: D001840:Dental Bonding; D003737:Dental Cavity Preparation; D045662:Dental Etching / Q000009:adverse effects / Q000379:methods*; D003793:Dental Restoration, Permanent / Q000009:adverse effects / Q000379:methods*; D003804:Dentin / Q000528:radiation effects; D006801:Humans; D066298:In Vitro Techniques; D053844:Lasers, Solid-State / Q000009:adverse effects / Q000627:therapeutic use*; D008964:Molar, Third / Q000528:radiation effects