Evaluating Shear Bond Strength of Different Glass Ionomer Cements to Dentin: An Experimental Study

The study aimed to estimate the shear bond strength (SBS) of various glass ionomer cements (GICs).

Forty-eight extracted premolars were divided into 12 each groups after doing coronal sectioning 1 mm under the junction of enamel and dentin (DEJ) at perpendicular to the long axis of the tooth by utilizing a diamond disc at low speed and implanted into acrylic blocks of measuring 2 cm × 2 cm: Group 1: Conventional GIC (GC Gold Label 2, Japan), Group 2: Resin Modified GIC (GC Gold Label 2 LC, Japan), Group 3: Zirconia Reinforced GIC (Shofu Zirconomer Improved, Japan), and Group 4: Hydroxyapatite Modified GIC (Prevest Crysta Bioactive, India). Following the company's directions, the experimental materials were bonded to the samples using a plastic cylinder template. The specimens were incubated for a day at 37°C in artificial saliva. Last, the universal tester machine with a stainless-steel (SS) knife at a speed of 0.5 mm/min, which was positioned perpendicular to the junction that connected the material and dentin, was used to perform the shear bond test (SBS) until debonding and measured in Mega Pascals (MPa). One-way ANOVA was used to analyze the data.

Associating mean SBS (MPa) among the groups showed a higher mean associated with group 3, followed by group 4, group 2, and then group 1, with a statistically significant difference.

The Zirconia Reinforced GIC showed the highest mean SBS than other different modifications of GIC.