Resumen

CAVALCANTI, Alessandro Leite et al. Resistencia al cizallamiento de dos sistemas adhesivos autocondicionantes en dientes decíduos - estudio in vitro: Shear bond strength of two self-etching adhesive in primary dentin - in vitro study. Acta odontol. venez [online]. 2008, vol.46, n.2, pp.176-179. ISSN 0001-6365.

The aim of this study was to compare the shear bond strengths of two adhesive systems to the dentine of primary teeth. Thirty-six human non-carious primary teeth were collected and stored in water at room temperature for no longer than 6 months after extraction. The teeth were embedded in acrylic resin and the dentin was exposed (carbide paper 120, 400 and 600 grit) and the specimens were randomly assigned in four groups (n=9). A 2mm-diameter dentin bonding site was demarcated, the adhesive systems (Adhese® and Clearfil SE Bond®) were applied and resin composite and compomers cones were bonded. The following 4 combinations were tested: G1 = Adhese® + Filtek Z-250®, G2 = Adhese® + Dyract®, G3 = Clearfil SE Bond® + Filtek Z-250® and G4 = Clearfil SE Bond® + Dyract®. After 48 hours in distilled water, tensile bond strength was tested to failure (1.0 mm/minute). After measuring shear bond strengths, specimens were prepared for stereomicroscopy evaluation and identification of failure type. Shear bond strength values ranged from 3.77 to 7.90 MPa. No statistically significant differences were found among the shear bond strengths (p > 0.05) of the groups and the mode of failure was mostly adhesive. The highest shear bond strength was achieved by G4 and the lowest by G1 and no differences statistically between the groups were observed.

Palabras clave : Adhesive Systems; Primary Teeth; Shear Strength.