2007 Volume 27 Issue 1 Pages 10-15
In our previous study Fuji II LC EM (FLC), which is a resin-modified glass-ionomer cement, with a G-Bond (GB) and a UniFil® Bond Self-Etching Primer (UP) showed higher and stabler shear bond strengths to dentin compared with a Cavity Conditioner (CC) attached to FLC. The objective of this study was to evaluate the effectiveness of these surface conditioners on FLC bonding strength to enamel.
FLC and VitremerTMR (VTM) were used as resin-modified glass-ionomer cements. CC, Self Conditioner (SC), UP, GB, Etching Liquid (EE) and VitrmerTM Primer (VP) for FLC and VP for VTM were used as surface conditioners. The bond strength of FLC with no conditioner (NC) was also tested. Flat enamel surfaces were prepared by grinding the proximal surfaces of 80 extracted human molars. The surface conditioners were handled according to the manufacturer's instructions. The shear bond strength was determined after storage in water at 37°C for 24 h.
The bond strengths of FLC (mean±SD; MPa) to enamel were 14.7±2.0 in CC, 12.8 ±1.1 in SC, 11.6±1.7 in UP, 17.0±1.6 in GB, 13.8 ± 1.4 in EE, 1.3 ± 1.1 in NC and 0.6 ± 1.1 in VP. That of VTM was 7.9 ± 1.6. Only GB showed significantly higher bond strength compared with CC. EE showed no difference and SC, UP, VP and NC showed significantly lower bond strength compared with CC.
CC is suitable in the cases of an enamel cavity or a shallow cavity as a surface conditioner of FLC. However, in a deep cavity or in a dentin cavity, GB or UP, which showed high and stable bond strength to dentin, are more suitable
