Efeito do selamento dentinário imediato e de materiais restauradores provisórios na resistência de união à dentina
Abstract
Objetivo: O objetivo do estudo foi avaliar, in vitro, o efeito da técnica do selamento dentinário imediato com um sistema adesivo de 5º geração, e da aplicação intermediária de dois materiais provisórios, na resistência de união à tração sobre a dentina. Materiais e método: A coroa de 75 dentes incisivos bovinos foram incluídas em resina acrílica quimicamente ativada, sendo a superfície vestibular desgastada até exposição da dentina. A superfície dentinária recebeu acabamento com lixas de granulação 400 e 600, sendo os dentes divididos em 5 grupos (n = 15): Grupo 1: Single Bond (controle); Grupo 2: Temp Bond NE + Single Bond; Grupo 3: Single Bond + Temp Bond NE + Single Bond; Grupo 4: Fermit + Single Bond; Grupo 5: Single Bond + Fermit + Single Bond. Os grupos 3 e 5 reproduziram a técnica de selamento imediato da dentina. Um cone de resina composta (Z250) foi construído sobre o adesivo. Após armazenamento por 24 horas a 37ºC em água destilada, os corpos-de-prova foram submetidos ao teste de resistência à tração em máquina de ensaio universal. Resultados: De acordo com a Análise de Variância, não houve diferença estatisticamente significativa nos valores médios de resistência à tração entre os grupos (p > 0,05): grupo 1 (16,84 MPa); grupo 2 (14,27 MPa); grupo 3 (17,27 MPa); grupo 4 (14,87 MPa); grupo 5 (12,97 MPa). Conclusão: A técnica de selamento imediato da dentina com o sistema adesivo Single Bond, assim como os materiais provisórios Temp Bond NE e Fermit, não influenciaram significativamente os valores de resistência de união à dentina.
UNITERMOS: adesivos; cimentos dentários; dentina.
SUMMARY
Objective: The purpose of the present study was to assess, in vitro, the effect of immediate dentin sealing technique with a fifth generation adhesive system, and the intermediate application of two provisional materials, on tensile bond strength to dentin. Materials and method: The crowns of 75 bovine incisors teeth were included in self-cured acrylic resin, abraded on a lathe to exposure the dentin. The dentin surface was polished with 400 and 600 grit abrasive paper, and the teeth were designated to five groups (n = 15): Group 1: Single Bond (control); Group 2: Temp Bond NE + Single Bond; Group 3: Single Bond + Temp Bond NE + Single Bond; Group 4: Fermit + Single Bond; Group 5: Single Bond + Fermit + Single Bond. Groups 3 and 5 represent the immediate dentin sealing technique. Resin-based composite (Z250) cones were bonded. After storage in distilled water at 37o C during 24 hours, the specimens were submitted to tensile bond strength test on a universal testing machine. Results: According to Analysis of Variance, there was no significant difference among groups (p > 0.05): Group 1 (16.84 MPa); Group 2 (14.27 MPa); Group 3 (17.27 MPa); Group 4 (14.87 MPa); Group 5 (12.97 MPa). Conclusion: The immediate dentin sealing technique with Single Bond, as well as Temp Bond NE and Fermit provisional materials, did not significantly influence the values of bond strength to dentin.
UNITERMS: adhesives; dental cements; dentin.
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