Shear bond strengths of three glass ionomer cements to enamel and dentine

Saads Carvalho, Thiago; van Amerongen, Willem-Evert; de Gee, Anton; Bönecker, Marcelo; Sampaio, Fábio-Correia (2011). Shear bond strengths of three glass ionomer cements to enamel and dentine. Medicina oral, patología oral y cirugía bucal, 16(3), e406-e410. Medicina Oral 10.4317/medoral.16.e406

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OBJECTIVES

The shear bond strength of three glass ionomer cements (GIC) to enamel and dentine was evaluated.

STUDY DESIGN

Sound permanent human molars (n=12) were grinded perpendicular to their axial axes, exposing smooth, flat enamel and dentine surfaces. The teeth were embedded in resin and conditioned with polyacrylic acid (25%; 10s). Twenty four specimens of each GIC: Fuji IX (FJ-GC), Ketac Molar Easymix (KM-3M ESPE) and Maxxion (MX-FGM) were prepared according to the Atraumatic Restorative Treatment (ART) (12 enamel and 12 dentine), in a bonding area of 4.91 mm² and immersed in water (37°C, 24h). The shear bond strength was tested in a universal testing machine. Non-parametric statistical tests (Friedman and post-hoc Wilcoxon Signed Ranks) were carried out (p=0.05).

RESULTS

The mean (±sd) of shear bond strength (MPa), on enamel and dentine, were: KM (6.4±1.4 and 7.6±1.5), FJ (5.9±1.5 and 6.0±1.9) and MX (4.2±1.5 and 4.9±1.5), respectively. There was a statistically significant difference between the GICs in both groups: enamel (p=0.004) and dentine (p=0.002). The lowest shear bond value for enamel was with MX and the highest for dentine was KM (p<0.05).

CONCLUSION

It is concluded that KM has the best adhesion to both enamel and dentine, followed by FJ and MX.

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