Push-out bond strength and sealing ability of etch-and-rinse and self-etching adhesives used for fiberglass dowel bonding at different depths of the root canals
Resistência de união por push-out e selamento marginal de sistemas adesivos convencionais e autocondicionantes utilizados para cimentação de pinos de vidro intrarradiculares em diferentes profundidades
Bastos, Pamela Cristina Amaral; Faria, Danielle Elaine de; Bridi, Enrico Coser; Amaral, Flávia Lucisano Botelho do; França, Fabiana Mantovani Gomes; Flório, Flávia Martão; Basting, Roberta Tarkany
Rev. odontol. UNESP, vol.40, n4, p.174-181, 2011
Abstract
The aim of this study was to evaluate the push-out bond strength and sealing ability of etch-and-rinse and self-etching adhesives used for fiberglass dowel bonding at different depths of the root canals. Ninety human pre-molar roots (45 for the push-out tests and 45 for the microleakage tests) had their canals prepared with standardized depths and were randomly allocated into 3 groups (n = 15) according to the adhesive system used: Adper Scotchbond Multi Purpose (3M ESPE); Adper Single Bond 2 (3M ESPE); Clearfil SE Bond (Kuraray). They were restored with fiberglass dowel and resin cement. For the push-out tests, the roots were radially cut at 3 different depths to obtain serial cuts with approximately a thickness of 1 mm. A universal testing machine (Emic) was used for the push-out test. For the microleakage group, roots were sealed, and immersed in a 2% methylene blue solution, pH 7.0, for a 2 hours period. Roots were radially sectioned at 3 different depths to obtain serial cuts with a thickness of approximately 1mm and microleakage was evaluated in stereoscopic loupe by three calibrated evaluators who attributed scores from 0 to 3. The Analysis of Variance and the Tukey test for the push-out tests showed no significant differences among adhesive systems (p > 0.05), but differences among the depths with higher bond strength at the cervical and apical depth. For microleakage, Kruskal-Wallis and Friedman tests showed that there was no significant difference among the adhesive systems tested or different depths of cut (p > 0.05). The total-etching and self-etching adhesive systems had similar bond strength and ability of marginal sealing for the cementation of fiberglass dowels and that higher bond strength was obtained at the most cervical and apical depths of the root canals.
Keywords
Push-out bond strength, microleakage, fiberglass dowels, adhesive system
Resumo
O objetivo deste estudo foi avaliar a resistência de união por push-out e o selamento marginal de sistemas adesivos convencionais e autocondicionantes utilizados para cimentação de pinos de vidro intrarradiculares em diferentes profundidades. Noventa raízes de pré-molares humanos (45 para os testes de push-out e 45 para os de microinfiltração) tiveram os canais preparados com profundidades padronizadas e foram aleatoriamente distribuídas em 3 grupos (n = 15) de acordo com o sistema adesivo utilizado: Adper Scotchbond Multi Purpose (3M ESPE); Adper Single Bond 2 (3M ESPE); Clearfil SE Bond (Kuraray). As raízes receberam pino de fibra de vidro com cimento resinoso. Para os testes de push-out, as raízes foram cortadas radialmente em 3 diferentes profundidades para obter cortes seriados de aproximadamente 1 mm de espessura. Uma máquina de ensaios mecânicos (Emic) foi utilizada para os ensaios de push-out. Para os testes de microinfiltração, as raízes foram seladas e imersas em solução de azul de metileno a 2%, pH 7,0 por 2 horas. As raízes foram cortadas radialmente em 3 diferentes profundidades para obter cortes seriados com espessura de 1 mm e a microinfiltração foi avaliada em lupa estereoscópica por 3 examinadores calibrados que atribuíram escores de 0 a 3. A Análise de Variância e o teste de Tukey para os testes de push‑out mostraram que não houve diferenças significativas entre os sistemas adesivos (p > 0,05), mas houve entre as profundidades, com maiores valores de resistência de união para o terço cervical e apical. Para os ensaios de microinfiltração, os testes de Kruskal-Wallis e de Friedman mostram que não houve diferença significativa entre os adesivos e entre as profundidades (p > 0,05). Os sistemas adesivos convencionais e autocondicionantes apresentaram semelhante resistência de união e de selamento marginal para a cimentação de pinos de fibra de vidro, havendo maior resistência de união nos terços mais cervicais e apicais dos canais.
Palavras-chave
Resistência de união por push-out, microinfiltração, pinos de fibra de vidro, sistema adesivo
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