title: Adhesives bonded to erbium:yttrium-aluminum-garnet laser-irradiated dentin: transmission electron microscopy, scanning electron microscopy and tensile bond strength analyses.
abstract: The aim of this in vitro study was to investigate the effect of erbium:yttrium-aluminum-garnet (Er:YAG) laser irradiation on dentinal collagen by transmission electron microscopy and to analyze the resin-dentin interface by scanning electron microscopy. A tensile bond strength test was also applied. Specimens from 69 sound human third molars were randomly divided into three groups: control (no laser), and two irradiated groups, laser 250 (250 mJ/2 Hz) and laser 400 (400 mJ/4 Hz). Then, specimens were restored with two adhesive systems, an etch-and-rinse or a self-etch system. Although ultrastructural examination showed a modified surface in the irradiated dentin, there was no statistical difference in bond strength values between the laser groups and controls (P < 0.05). In conclusion, the use of Er:YAG laser for ablating human dentin did not alter the main adhesion parameters when compared with those obtained by conventional methods, thus reinforcing its use in restorative dentistry.
authors: School of Dentistry, University of Fortaleza, Fortaleza, CE, Brazil. aramos@unifor.br
authors: Andreia Cristina Bastos
authors: AC
authors: Ramos
authors: Marcella
authors: M
authors: Esteves-Oliveira
authors: Victor E
authors: VE
authors: Arana-Chavez
authors: Carlos
authors: C
authors: de Paula Eduardo
mesh_terms: D003094:Collagen / Q000528:radiation effects / Q000648:ultrastructure; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements; D045662:Dental Etching; D003793:Dental Restoration, Permanent / Q000379:methods; D003804:Dentin / Q000528:radiation effects* / Q000648:ultrastructure*; D006801:Humans; D066298:In Vitro Techniques; D053844:Lasers, Solid-State / Q000627:therapeutic use*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D013718:Tensile Strength
chemical_list: D003738:Dental Cements; D003094:Collagen