In vitro evaluation of the Nd:YAG and Er:YAG lasers irradiation on the root sealing with different root canal filling cement / Avaliação In vitro da irradiação com laser de Nd:YAG e Er:YAG no selamento radicular, variando-se o cimento obturador do sistemas de canais radiculares

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The aim of this in vitro study was to analyze two high power lasers irradiation effects before the root canal filling procedure with resin endodontic cements on the lateral sealing. Thirty-six permanent human molars were endodontically treated and randomly assigned in nine experimental groups (n=4) according with the subsequent dentin treatment. The groups were as follows: G1 (N-Rickert); G2 (Epiphany SE®); G3 (Endo REZ®); G4 (N-Rickert / Nd:YAG laser irradiation); G5 (Epiphany SE® / Nd:YAG laser irradiation); G6 (EndoREZ® / Nd:YAG laser irradiation); G7 (N-Rickert / Er:YAG laser irradiation); G8 (Epiphany SE® / Er:YAG laser irradiation) and G9 (EndoREZ® / Er:YAG laser irradiation). The laser parameters used were: Nd:YAG laser (1064 nm) at 1.5W, 100 mJ, 15 Hz; and Er:YAG laser (2940 nm) at 1.0 W, 100 mJ, 10Hz. All the teeth were filled by the same operator using the single cone technique for the elements filled with resin cements and multiple cones when the NRickert cement was used. The analyzed cements were prepared following the manufacturers recommendations. After the waiting and total setting time of all the root canal filling materials all the samples were coated along their root surfaces with Araldite®. Micro centrifuge tubes of 1.5 ml were cut in one of the edges and the samples were introduced until their apexes were externally located. The space between the root surface and the micro centrifuge tubes was sealed with Araldite® in order to seal the inferior tube portion. Following this, all samples were sterilized by ethylene oxide at a temperature of 56oC for four hours. The tubes were immersed in penicillin glasses with 5 ml of BHI previously sterilized. Enterococcus faecalis colonies were sought inside the tubes in order to observe a possible marginal percolation of the studied cements through a culture media turbidity process for a period of 45 days. It was possible to observe after the evaluation period an absence of contamination (0%) on samples from G1, G3 and G8; 50% of contamination on samples from G5 and G6; 75% of contamination on samples from G2 and G9 and 100% of contamination on samples from G7.

ASSUNTO(S)

resin cements root canal sealing cimentos resinosos lasers em alta intensidade endodontics selamento radicular endodontia high power lasers

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