Moura-Netto, CacioGuglielmi, Camila de A.B.Mello-Moura, Anna Carolina VolpiPalo, Renato Miotto [UNESP]Raggio, Daniela PrócidaCaldeira, Celso Luiz2014-05-272014-05-272011-10-24Brazilian Dental Journal, v. 22, n. 5, p. 377-381, 2011.0103-64401806-4760http://hdl.handle.net/11449/72754The purpose of this in vitro study was to evaluate the effect of neodymium:yttrium-aluminum-garnet (Nd:YAG) laser irradiation on intracanal dentin surface by SEM analysis and its interference in the apical seal of filled canals. After endodontic treatment procedures, 34 maxillary human incisors were randomly assigned to 2 groups. In the negative control group (n=17), no additional treatment was performed and teeth were filled with vertically condensed gutta-percha; in the laser-treated group (n=17), the root canals were irradiated with Nd:YAG laser (1.5 W, 100 mJ, 15 Hz) before filling as described for the control group. Two specimens of each group were prepared for SEM analysis to evaluate the presence and extent of morphological changes and removal of debris; the other specimens were immersed in 0.5% methylene blue dye (pH 7.2) for 24 h for evaluation of the linear dye leakage at the apical third. SEM analysis of the laser-treated group showed dentin fusion and resolidification without smear layer or debris. The Student's t-test showed that the laser-treated group had significantly less leakage in apical third than the control group. Within the limitations of this study, it may be concluded that the morphological changes on the apical intraradicular dentin surface caused by Nd:YAG laser resulted in less linear dye apical leakage.377-381engApical leakageEndodonticsIntracanal irradiationLaserAH Pluscoloring agentdiagnostic agentepoxy resingutta perchamethylene blueroot canal filling materialchemistryclassificationclinical trialcomparative studycontrolled clinical trialcontrolled studydental bondingdental surgerydentinendodonticshumanmaterials testingmethodologyradiation exposurerandomized controlled trialscanning electron microscopysolid state lasertimetooth diseasetooth pulptooth rootultrastructureColoring AgentsDental BondingDental LeakageDental Pulp CavityDentinEpoxy ResinsGutta-PerchaHumansLasers, Solid-StateMaterials TestingMethylene BlueMicroscopy, Electron, ScanningRoot Canal Filling MaterialsRoot Canal ObturationRoot Canal PreparationSmear LayerTime FactorsTooth ApexArtigo10.1590/S0103-64402011000500005S0103-64402011000500005Acesso aberto2-s2.0-800547644082-s2.0-80054764408.pdf