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Bonding to the tooth structure and fluoride release of the restoration are substantial factors to prevent the caries progression in children.

The aim of this study was to compare micro tensile bond strength of four glass-containing materials with primary teeth dentin.

In this in-vitro study, 16 extracted primary molar were prepared and disinfected with 0.2% thymol solution. The occlusal box was prepared until a thin enamel wall remained and the dentin exposed at the pulpal floor. This enamel wall played the matrix role for placing the restorative materials. The teeth were randomly divided into 4 groups and restored with resin modified glass ionomer (RMGI), giomer, zirconomer and cention N. The teeth were mounted in acrylic mold and entered into a CNC cutting machine to provide specimens with a thickness of 1 × 1 mm. The tensile bond strength of the specimens was calculated by micro tensile measuring device. The failure of the samples (adhesive, cohesive, admix) was observed under a stereomicroscope. The data were analyzed using one-way analysis of variance and Fisher's exact test.

There was a significant difference between zirconomer and other groups (P < 0.001), also between giomer and other groups (P < 0.001). There was no significant difference in the pattern of the failure among groups, except RMGI and cention N.

The micro-tensile bond of the giomer was the strongest, cention N and RMGI were approximately of equal strength, and zirconomer showed the lowest tensile bond strength.