Estudio comparativo de la Fuerza de Adhesión de dos sistemas adhesivos en las Técnicas SDD y SDI.

Abstract

The purpose of this study was to determine the effectiveness of immediate dentin sealing (IDS) using total-etch or self-etch dentin adhesives by mean of the microtensile bond strength test (μBts) to dentine of indirect composite restorations. Forty recently extracted molars were abraded flat to expose middle coronal dentin. The teeth were assigned to four (4) experimental groups (n=10) according to the indirect composite restoration cementation technique used. G1: delayed dentin sealing with Adper Single Bond 2 (DDS/SB2); (G2) delayed dentin sealing technique using One Coat bond (DDS/OCB); (G3) immediate dentin sealing using Single Bond (IDS/SB); (G4) immediate dentin sealing using one coat bond (IDS/OCB). An ISOMET 1000™ (Buehler) precision saw was used to obtain several microspecimens from samples, that were tested in tension a croohead speed of 1 mm/min up to failure in a universal testing machine. The MPa values obtained were analized with a univariate ANOVA (μBts) for adhesive and dentin sealing technique factors by mean of the using the SPSS 19.0® statistics software. P value was established at 0,05. μBts level adhesive p=0,006; with significant differences. Homogeneous groups, mean (MPa) and standard deviation were: SB2 (G1+G3): 24,12(9,7) ˃ OCB (G2+G4): 19,33(8,35). μBts level IDS p=0,005; with significant differences. Homogeneous groups, mean (MPa) and standard deviation were: IDS (G3+G4): 24,19(10,02) ˃ DDS (G1+G2): 19,26(7,92). Adhesive – IDS interaction was p=0,300; no significant statistical differences. Total-etch adhesive (SB2) resulted in higher bond strengths to dentin than self –etching adhesive (OCB) and IDS technique resulted in better bond strengths to dentin for both adhesives.