title: Micro-shear bond strength of Er:YAG-laser-treated dentin.
abstract: This study tested if dentin adhesion is affected by Er:YAG laser. Ninety dentin disks were divided in groups (n = 10): G1, control; G2, Er:YAG laser 150 mJ, 90 degrees contact, 38.8 J/cm(2); G3, Er:YAG laser 70 mJ, 90 degrees contact, 18.1 J/cm(2); G4, Er:YAG laser 150 mJ, 90 degrees non-contact, 1.44 J/cm(2); G5, Er:YAG laser 70 mJ, 90 degrees non-contact, 0.67 J/cm(2); G6, Er:YAG laser 150 mJ, 45 degrees contact, 37.5 J/cm(2); G7, Er:YAG laser 70 mJ, 45 degrees contact, 17.5 J/cm(2); G8, Er:YAG laser 150 mJ, 45 degrees non-contact, 1.55 J/cm(2); and G9, Er:YAG laser 70 mJ, 45 degrees non-contact, 0.72 J/cm(2). Bonding procedures were carried out and the micro-shear-bond strength (MSBS) test was performed. The adhesive surfaces were analyzed under SEM. Two-way ANOVA and multiple comparison tests revealed that MSBS was significantly influenced by the laser irradiation (p < 0.05). Mean values (MPa) of the MSBS test were: G1 (44.97 +/- 6.36), G2 (23.83 +/- 2.46), G3 (30.26 +/- 2.57), G4 (35.29 +/- 3.74), G5 (41.90 +/- 4.95), G6 (27.48 +/- 2.11), G7 (34.61 +/- 2.91), G8 (37.16 +/- 1.96), and G9 (41.74 +/- 1.60). It was concluded that the Er:YAG laser can constitute an alternative tool for dentin treatment before bonding procedures.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry of São Paulo, University of São Paulo (USP), Sao Paulo, SP 05508-900, Brazil. rcorte@terra.com.br
authors.forename: Rubens C R
authors.initials: RC
authors.lastname: de Carvalho
authors.forename: Patricia M
authors.initials: PM
authors.lastname: de Freitas
authors.forename: Masayuki
authors.initials: M
authors.lastname: Otsuki
authors.forename: Carlos P
authors.initials: CP
authors.lastname: de Eduardo
authors.forename: Junji
authors.initials: J
authors.lastname: Tagami
mesh_terms: D000268:Adhesiveness / Q000528:radiation effects*; D000535:Aluminum; D003094:Collagen / Q000528:radiation effects; D003188:Composite Resins / Q000528:radiation effects*; D001840:Dental Bonding / Q000295:instrumentation* / Q000379:methods; D003804:Dentin / Q000502:physiology*; D004307:Dose-Response Relationship, Radiation; D004871:Erbium; D006801:Humans; D007834:Lasers; D028022:Low-Level Light Therapy / Q000295:instrumentation* / Q000379:methods; D008689:Methacrylates; D033081:Shear Strength; D015019:Yttrium
chemical_list: D003188:Composite Resins; D008689:Methacrylates; C503779:yttrium-aluminum-garnet; D015019:Yttrium; D004871:Erbium; D003094:Collagen; D000535:Aluminum