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International Journal of Morphology

versión On-line ISSN 0717-9502

Resumen

BRAVO, Cristián et al. In-vitro Comparative Study of the use of 2 % Chlorhexidine on Microtensile Bond Strength of Different Dentin Adhesives: A 6 Months Evaluation. Int. J. Morphol. [online]. 2017, vol.35, n.3, pp.893-900. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022017000300016.

The aim of this study was to evaluate the effect of chlorhexidine (CHX) dentin treatment on microtensile bond strength (µTBS) of adhesive systems in different storage times. Occlusal enamel was removed from ninety third-molars and flat surfaces of middle dentin were exposed. Teeth were randomly divided in 6 groups according to adhesive system (etch-and-rinse : Adper Scotchbond 1XT - ASB ; self-etch: Adper Prompt L-Pop ­ APP; and universal: Single Bond Universal - SBU) and chlorhexidine (CHX) dentin treatment (2 % CHX application for 20 s prior Primer). After resin composite build up, teeth were sectioned to obtain beam specimens and divided in 3 subgroups (n=5): 72h, 3 and 6 months storage times. After the storage times, teeth were tested in tension until failure (0.5 mm/min). SEM was performed to observe hybrid layer of adhesive systems. Data were analyzed using one-way ANOVA and Tukey tests. At 72 h, all equivalent groups (same adhesive system, different dentin treatments) maintained their µTBS when compared CHX-treatment. At 3 and 6 months, non-treated CHX groups showed less µTBS than CHX-treated ones. Six months storage time did not significantly decrease µTBS, except for G2-ASB. The effect of CHX on dentin µTBS depends on storage times and adhesive systems. While immediate µTBS was not affected by CHX treatment, CHX improved dentin µTBS after 3 and 6 months.

Palabras clave : Microtensile bond strength; Dentin; Chlorhexidine; Dentin adhesives; Adhesion.

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