title: Apical leakage of three resin-based endodontic sealers after 810-nm-diode laser irradiation.
abstract: OBJECTIVE
  To evaluate the influence of 810-nm-diode laser irradiation, applied before root canal filling, on apical sealing ability of three different resin-based sealers (AH Plus, EndoRez, and RealSeal).
  
  
  BACKGROUND
  Lasers have been widely used in endodontics. The dentin wall changes caused by laser irradiation could improve the sealing ability of endodontic cements.
  
  
  METHODS
  Sixty single-rooted human teeth were divided into six groups, according to the endodontic sealer used and previous 810-nm-diode laser irradiation. The protocol for laser irradiation was 2.5 W in a continuous wave, in scanning mode, with four irradiations per tooth. After sample preparation, they were analyzed according to apical leakage with silver nitrate impregnation.
  
  
  RESULTS
  The RealSeal sealer achieved minimum leakage rates (1.24 mm), with significant differences at the 1% level (Tukey's test, p<0.01) from AH Plus (1.84 mm) in nonirradiated groups. When the laser was used, there were also significant differences at the 5% level (p<0.05) between irradiated groups (1.31 and 1.78 mm, respectively).
  
  
  CONCLUSIONS
  The 810-nm-diode laser irradiation did not promote significant differences in apical leakage.
authors.affiliation: Department of Endodontics, University of São Paulo, São Paulo, Brazil. caciomn@usp.br
authors.forename: Cacio
authors.initials: C
authors.lastname: Moura-Netto
authors.forename: Tiago
authors.initials: T
authors.lastname: Pinto
authors.forename: Harry
authors.initials: H
authors.lastname: Davidowicz
authors.forename: Abilio Albuquerque Maranhão
authors.initials: AA
authors.lastname: de Moura
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins / Q000528:radiation effects*; D001840:Dental Bonding; D003763:Dental Leakage / Q000517:prevention & control*; D003804:Dentin / Q000528:radiation effects / Q000648:ultrastructure; D004853:Epoxy Resins; D006801:Humans; D054023:Lasers, Semiconductor; D011897:Random Allocation; D012387:Root Canal Filling Materials; D018915:Root Canal Preparation / Q000295:instrumentation*; D013499:Surface Properties; D019227:Tooth Apex / Q000528:radiation effects* / Q000648:ultrastructure
chemical_list: D003188:Composite Resins; C481259:EndoRez; D004853:Epoxy Resins; C511498:Real Seal composite resin; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer