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


METHODS
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).


CONCLUSIONS
It is concluded that KM has the best adhesion to both enamel and dentine, followed by FJ and MX.
Departamento de Odontologia Clínica e Social, Universidade Federal da Paraíba, João Pessoa PB, Brazil. thiagosaads@hotmail.com
Thiago-Saads
TS
Carvalho
Willem-Evert
WE
van Amerongen
Anton
A
de Gee
Marcelo
M
Bönecker
Fábio-Correia
FC
Sampaio
D002484:Cementation; D003743:Dental Enamel; D003804:Dentin; D005899:Glass Ionomer Cements; D006801:Humans; D066298:In Vitro Techniques
D005899:Glass Ionomer Cements