Avaliação do Selamento de Ápices Radiculares Preparados com Ultra-Som e Brocas e Retrobturados com Diferentes Materiais Mediante Infiltração Marginal por Corante*
Evaluation of apical sealing of roots prepared with ultrasonics and bur, and retrofilled with different materials, under marginal dye leakage
Assis, N.M.S.P.; Gomes, A.P.M.; Visconti Filho, R.F.; Valera, M.C.; Ildefonso, P.R.E.
Rev. odontol. UNESP, vol.32, n1, p.1-8, 2003
Abstract
O objetivo deste trabalho foi avaliar o selamento de ápices radiculares preparados com ultra-som e brocas convencionais e retrobturados com amálgama e MTA mediante infiltração marginal por corante. Foram utilizados 64 dentes unirradiculados humanos extraídos, divididos em quatro grupos de 16: A1 - preparo convencional com brocas e retrobturação com amálgama; A2 - preparo convencional com brocas e retrobturação com MTA; B1 - preparo com ultra-som e retrobturação com amálgama; B2 - preparo com ultra-som e retrobturação com MTA. Dois espécimes de cada grupo foram utilizados como controles positivo e negativo. Após impermeabilização, os espécimes foram imersos em tinta nanquim por 48 horas. As infiltrações ocorridas foram avaliadas com auxílio de estereomicroscópio e os resultados foram submetidos à análise estatística. Os grupos retrobturados com MTA apresentaram os menores valores de infiltração marginal, independentemente do tipo de preparo, com diferenças estatisticamente significativas em relação aos outros grupos.
Keywords
Apicectomia, infiltração dentária, MTA, retrobturação, ultra-som
Resumo
The purpose of this study was to evaluate the apical sealing of roots retrofilled with two materials and the effects of ultrasonic and bur preparation on the apical marginal dye leakage. Sixty-four extracted single-rooted human teeth were divided into four groups: A1- conventional preparation and amalgam retrofilling; A2- conventional preparation and MTA retrofilling; B1- ultrasonic preparation and amalgam retrofilling; B2- ultrasonic preparation and MTA retrofilling. Two samples of each group were used as positive and negative controls. The samples had their external surface sealed and were immersed in Indian ink for 48 h. Dye penetration was evaluated under a stereomicroscope and the statistical analysis of the results was performed. The results showed that MTA had the lowest rate of leakage with significant differences among the other groups, regardless the type of preparation.
Palavras-chave
Apicoectomy, marginal leakage, MTA, retrofilling, ultrasonics
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