title: Effect of dental surface treatment with Nd:YAG and Er:YAG lasers on bond strength of resin composite to recently bleached enamel.
abstract: The aim of this work is to evaluate the effect of surface treatment with Er:YAG and Nd:YAG lasers on resin composite bond strength to recently bleached enamel. In this study, 120 bovine incisors were distributed into two groups: group C: without bleaching treatment; group B: bleached with 35% hydrogen peroxide. Each group was divided into three subgroups: subgroup N: without laser treatment; subgroup Nd: irradiation with Nd:YAG laser; subgroup Er: irradiation with Er:YAG laser. The adhesive system (Adper Single Bond 2) was then applied and composite buildups were constructed with Filtek Supreme composite. The teeth were sectioned to obtain enamel-resin sticks (1 × 1 mm) and submitted to microtensile bond testing. The data were statistically analyzed by the ANOVA and Tukey tests. The bond strength values in the bleached control group (5.57 MPa) presented a significant difference in comparison to the group bleached and irradiated with Er:YAG laser (13.18 MPa) or Nd:YAG (25.67 MPa). The non-bleached control group presented mean values of 30.92 MPa, with statistical difference of all the others groups. The use of Nd:YAG and Er:YAG lasers on bleached specimens was able to improve the bond strengths of them.
authors.affiliation: São José dos Campos Dental School, São Paulo State University, São Paulo, Brazil.
authors.forename: Carlos
authors.initials: C
authors.lastname: Rocha Gomes Torres
authors.forename: Taciana Marco Ferraz
authors.initials: TM
authors.lastname: Caneppele
authors.forename: Regina
authors.initials: R
authors.lastname: Del Moral de Lazari
authors.forename: Carolina Ferraz
authors.initials: CF
authors.lastname: Ribeiro
authors.forename: Alessandra Buhler
authors.initials: AB
authors.lastname: Borges
mesh_terms: D000180:Acrylic Resins / Q000528:radiation effects*; D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000528:radiation effects*; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000528:radiation effects*; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents / Q000737:chemistry / Q000528:radiation effects*; D007180:Incisor; D053844:Lasers, Solid-State; D008422:Materials Testing; D011140:Polyurethanes / Q000528:radiation effects*; D012117:Resins, Synthetic / Q000528:radiation effects*; D013718:Tensile Strength; D014073:Tooth Bleaching
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D011140:Polyurethanes; D012117:Resins, Synthetic