Investigation of Coronal Leakage of Root Fillings after Smear Layer Removal with EDTA or Er,Cr:YSGG Laser through Capillary Flow Porometry

Abstract

No studies have been performed evaluating the marginal seal of root fillings after direct exposure of root canal (RC) walls to Er,Cr:YSGG laser irradiation. Therefore, 75 root filled teeth (5 × 15–cold lateral condensation) were analyzed for through-and-through leakage (TTL) using capillary flow porometry (CFP). The cleaning protocol determined the experimental groups: (1) irrigation with NaOCl 2.5% and EDTA 17% or standard protocol (SP), (2) SP + Er,Cr:YSGG lasing (dried RC), (3) NaOCl 2.5% + Er,Cr:YSGG lasing (dried RC), (4) SP + Er,Cr:YSGG lasing (wet RC), and (5) NaOCl 2.5% + Er,Cr:YSGG lasing (wet RC). Groups 6 to 10 consisted of the same filled teeth with resected apices. Resection was performed after the first CFP measurement. CFP was used to assess minimum, mean flow, and maximum pore diameters after 48 h. Statistics were performed using nonparametric tests (P > 0.05). Additional three roots per group were submitted to SEM of the RC walls. TTL was observed in all groups without statistically significant differences between the different groups for minimum, mean, and maximum pore diameter (P > 0.05). In this study, the use of EDTA and/or Er,Cr:YSGG laser did not reduce through-and-through leakage in nonresected and resected roots.

Endodontic retreatment of curved root canals using the dual wavelength erbium, chromium:yttrium, scandium, gallium, garnet, and diode 940-nm lasers and the XP-Endoshaper/finisher technique

“…Positive results have been reported regarding the debridement effect of different Er,Cr:YSGG laser setting combinations in straight root canals [18,19,33]. Additionally, it has been shown that the combined use of the Er,Cr:YSGG and diode 940 nm lasers provide an effective and safe method in removing the smear layer and simultaneously disinfecting straight canals [23,34,35].…”

Bond strength of epoxy resin‐based root canal sealer to human root dentin irradiated with Er,Cr:YSGG laser

“…In order for the laser to act inside the root canal, the ideal situation can be achieved by performing the irradiation using thin optical fibers compatible with the final diameter. The optical fibers should also be flexible enough to follow curvatures when present . Thus, in this study, the RFT2 tip type was used with side firing and a 275 µm diameter, which allowed for laser irradiation by means of helical movements, since the final diameter was 450 µm .…”

“…The Er,Cr:YSGG laser, with a wavelength of 2.79 μ, when absorbed by water and hydroxyapatite, causes micro explosions and removal of target tissue by ablation . One of its advantages is the ability to control air and water during the irradiation while utilizing flexible tips specifically designed for endodontic use, which can be inserted up to the working length due to a diameter compatible with the internal diameter of the root canal .…”

Avaliação <i>ex vivo</i> da resistência de união de cimento à base de resina epóxica na dentina humana irradiada com laser Er,Cr:YSGG

“…O laser pode ser utilizado como auxílio, para melhorar não só a limpeza e a desinfecção, mas também o vedamento do sistema de canais radiculares no momento da obturação, apresentando resultados promissores, uma vez que promove modificações morfológicas na parede dentinária e na camada de smear, (TAKEDA et al, 1998;1999;YAMAZAKI et al, 2001;SANTOS et al, 2005;COSTA-RIBEIRO et al, 2007;MOHAMMADI, 2009;VIOLICH;CHANDLER, 2010;SILVA et al, 2010), redução microbiana (BELIKOV et al, 1995;GUTKNECHT et al, 2004;VEZZANI et al, 2006;YASUDA et al, 2010;YAVARI et al 2010;MEIRE et al, 2012), selamento do forame apical (WEICHMAN; JOHNSON, 1971;NEIBURGER, 1992;GEKELMAN et al, 2002;GARIP et al, 2011;MARQUES et al, 2011) e alteração da permeabilidade dentinária (BRUGNERA-JUNIOR et al, 2003;ARANHA et al, 2005;ESTEVES-OLIVEIRA et al, 2010;SILVA et al, 2010) (VERGAUWEN et al, 2014), conduz uma mistura de água e vapor através de uma fibra ótica coberta por safira, trabalhando de modo pulsado, com duração de 140 a 200 µs, taxa de repetição de 5 a 100 Hz, podendo variar a potência de 0 até 6 W. Possui comprimento de onda de 2,79 μm, que, ao ser absorvido pela água e hidroxiapatita, causa micro explosões e remoção do tecido alvo por ablação (EHSANI et al, 2013).…”

“…A ablação é um processo de remoção de tecido, onde os fótons são absorvidos causando um rápido aumento de temperatura e da pressão de água intersticial, o que leva à ruptura do tecido adjacente, removendo-o juntamente com o vapor de água formado. Um dos diferenciais do laser Er,Cr:YSGG é a possibilidade de controle de ar e água durante a irradiação, além de possuir pontas específicas flexíveis para uso endodôntico, as quais podem ser inseridas até o comprimento de trabalho por possuir diâmetro compatível com o diâmetro interno do canal radicular (EKWORAPOJ; SIDHU; MCCABE, 2007;SCHOOP et al, 2009;EHSANI et al, 2013;VERGAUWEN et al, 2014;KIRMALI et al, 2014).…”