in vitro study of the effect of er: yag laser irradiation on the apical sealing of different root canal sealers estudo "in vitro" do efeito da irradiação do laser er: yag no selamento apical de diferentes tipos de cimentos obturadores

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ID: 159403
2006
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Abstract
OBJECTIVES: The aim of this study was to determine the effect of Er:YAG laser irradiation used to clean dentinal walls on the apical sealing of root canals filled with different types of sealers. Background Data: Laser application to the dentinal walls removed debris, rendering the root canals free of smear layers and leaving the dentinal canaliculi open. METHODS: Sixty-four maxillary canines obtained from laboratory files were instrumented with K-files (Dentsply, Maillefer, Ballaigues, Switzerland) using the crown-down technique, and irrigated with a 0.5% sodium hypochlorite solution. The specimens were divided into two groups of 32 teeth each. In group I, the teeth were instrumented and irrigated with sodium hypochlorite solution, and divided into four subgroups to be sealed with the different materials (Endofill, N-Rickert, Sealapex and Sealer 26). In group II, the root canals were subjected to Er:YAG laser irradiation (200 mJ, 7 Hz and 60 J total energy), followed by root canal sealing as in group I. RESULTS: The data showed lower levels of apical microleakage in the teeth filled with N-Rickert, Sealapex and Sealer 26 cements than in those sealed with Endofill (p < 0.01). No significant difference in microleakage was observed between teeth irrigated only with 0.5% sodium hypochlorite and those submitted to Er:YAG laser application (p > 0.05). CONCLUSIONS: The Er:YAG laser irradiation applied to the root canal walls was not able to prevent apical microleakage.
OBJETIVOS: Avaliou-se a infiltração marginal apical em caninos superiores, obturados com quatro tipos diferentes de cimento, os quais foram imersos em tinta nanquim e mantidos a uma temperatura de 37º C por 96 horas, descalcificados em solução de ácido clorídrico a 5%, desidratados em série crescente de álcoois e diafanizados em salicilato de metila. MÉTODOS: Para isto, 64 dentes de estoque foram instrumentados pela técnica "crown-down", irrigados com solução de hipoclorito de sódio a 0,5% e divididos em dois grupos experimentais. Os dentes do Grupo I foram subdivididos em quatro sub-grupos de oito elementos e obturados cada um deles com os cimentos Endofill®, N-Rickert®, Sealapex® e Sealer 26®. Os dentes do Grupo II receberam aplicação adicional de laser Er:YAG, tendo seus canais radiculares obturados como aqueles do grupo I. RESULTADOS: A infiltração marginal apical apresentou valores estatisticamente maiores e significantes (p < 0,01), nos dentes obturados com o cimento Endofill®, em relação à infiltração ocorrida nos dentes obturados com os cimentos N-Rickert®, Sealapex® e Sealer 26®. Não houve diferença estatística significante (p > 0,05), quanto à infiltração marginal apical, nos dentes do Grupo I, preparados somente com a solução de hipoclorito de sódio a 0,5%, e naqueles do Grupo II, que foram irradiados com laser Er: YAG. CONCLUSÕES: A irradiação de laser Er:YAG aplicada nas paredes do canal radicular não foi capaz de prevenir a infiltração marginal apical.
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Authors ;Fernanda Vieira Medina;Manoel Damião Souza-Neto;Jacy Ribeiro Carvalho-Junior;Heid Sueli Leme dos Santos;Melissa Albanese Mezzena;Lucas da Fonseca Roberti Garcia
Journal journal of animal and plant sciences
Year 2006
DOI
10.1590/S1678-77572006000400009
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572006000400009
Keywords
endodontics materiais restauradores do canal radicular

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