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Objetivo: Analisar a influência na permeabilidade dentinária da redução do tempo de aplicação do adesivo universal OptiBond Universal® (Kerr), aplicado pela técnica etch-and-rinse e self- etch.
Método: Foram selecionados e distribuídos 20 espécimes em dois grupos de estudo: Grupo I – aplicação do adesivo universal durante 5 segundos, pela técnica self-etch; Grupo II – aplicação do adesivo universal durante 5 segundos pela técnica etch-and-rinse. A permeabilidade máxima foi medida após o condicionamento ácido de cada espécime com ácido ortofosfórico durante 15 segundos. De seguida foi aplicado e polimerizado o adesivo, e medida novamente a permeabilidade do espécime. As diferenças na redução da permeabilidade após a aplicação do adesivo foram analisadas com o t-test.
Resultados: Verificou-se redução da permeabilidade dentinária após a aplicação do adesivo em ambos os grupos de estudo. A redução do Grupo II (81.7±11.43%) foi superior, comparativamente ao Grupo I (71.8±18.07%). No entanto não se verificaram diferenças estatisticamente significativas entre os grupos estudados (p=0.160).
Conclusão: A permeabilidade dentinária não é influenciada pela aplicação de um sistema universal pela técnica etch-and-rinse ou pela técnica self-etch, com a redução do tempo de aplicação para 5 segundos.
Aim: To analyze the influence in dentin permeability of the 5-second appliance of OptiBond Universal® (Kerr Corp., Orange, EUA), comparing modes of application, etch-and-rinse and self-etch. Methods: 20 specimes were randomly assigned to 2 study groups: group I – application of the adhesive during 5 seconds by self-etch mode; group II – application of the adhesive during 5 seconds by etch-na-rinse mode. The maximum permeability was measured in each specimen after the application of 37.5% phosphoric acid for 15 seconds. The adhesive was then applied and light-cured, and the permeability measured once more. The differences in permeability reduction after adhesive application were analyzed with the Kolmogorov-Smirnov test, the Levene test and the t-test. Results: Both study groups showed a reduction of permeability after the application of the adhesive. The reduction in Group II (81.7±11.43%) was higher when compared to Group I (71.8±18.07%), although there were no statistical differences between groups (p=0.160). Conclusion: Dentin permeability does not seem to be influenced by the mode of application of the adhesive, whether it is etch-and-rinse or self-etch, when the time of the adhesive application is reduced to 5 seconds.
Aim: To analyze the influence in dentin permeability of the 5-second appliance of OptiBond Universal® (Kerr Corp., Orange, EUA), comparing modes of application, etch-and-rinse and self-etch. Methods: 20 specimes were randomly assigned to 2 study groups: group I – application of the adhesive during 5 seconds by self-etch mode; group II – application of the adhesive during 5 seconds by etch-na-rinse mode. The maximum permeability was measured in each specimen after the application of 37.5% phosphoric acid for 15 seconds. The adhesive was then applied and light-cured, and the permeability measured once more. The differences in permeability reduction after adhesive application were analyzed with the Kolmogorov-Smirnov test, the Levene test and the t-test. Results: Both study groups showed a reduction of permeability after the application of the adhesive. The reduction in Group II (81.7±11.43%) was higher when compared to Group I (71.8±18.07%), although there were no statistical differences between groups (p=0.160). Conclusion: Dentin permeability does not seem to be influenced by the mode of application of the adhesive, whether it is etch-and-rinse or self-etch, when the time of the adhesive application is reduced to 5 seconds.
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