Influence of Nd:YAG and diode laser irradiation on apical sealing when associated with AH plus and EndoREZ endodontic cements.
OBJECTIVE
This study aims to evaluate the influence of Nd:YAG and diode laser irradiation on apical sealing when applied before root canal filling done with two different resin-based cements (AH Plus and EndoREZ).


BACKGROUND
Lasers have been widely used in endodontics. The morphologic changes in dentin walls caused by Nd:YAG and diode laser irradiation could improve sealing ability of endodontic cements.


METHODS
Eighty canine teeth were analyzed by apical leakage of methylene blue dye and by scanning electron microscope (SEM) images of the filling's adaptation to the apical third dentin walls. The laser irradiation parameters for the Nd:YAG laser were 100 mJ, 15 Hz, and 1.5 W, and for the diode laser was 2.5 W (continuous mode).


RESULTS
The apical leakage results showed statistically significant differences at the 5% level of significance (Tukey's test, p < 0.05) among the different root canal wall treatments, independently of the root canal filling cement used. The cements also showed significant differences between them on the lased groups. The SEM analysis revealed better filling adaptation for AH Plus and the Nd:YAG laser group, confirming the microleakage results.


CONCLUSIONS
We concluded that the combination of the Nd:YAG laser and AH Plus showed the best results.
de Moura-Netto
Cacio
C
Department of Endodontics University of São Paulo-USP, São Paulo, Brazil. caciomn@usp.br
de Freitas Carvalho
Camilla
C
de Moura
Abilio Albuquerque Maranhão
AA
Davidowicz
Harry
H
Antoniazzi
João Humberto
JH
D003188:Composite Resins; D001840:Dental Bonding; D004853:Epoxy Resins; D006801:Humans; D054023:Lasers, Semiconductor; D053844:Lasers, Solid-State; D019279:Resin Cements; D012387:Root Canal Filling Materials; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods; D013499:Surface Properties / Q000528:radiation effects; D019227:Tooth Apex / Q000528:radiation effects* / Q000648:ultrastructure
D003188:Composite Resins; C481259:EndoRez; D004853:Epoxy Resins; D019279:Resin Cements; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer