comparative evaluation of microtensile bond strength of four glass-containing materials with primary teeth dentin

Background: bonding to the tooth structure and fluoride release of the restoration are substantial factors to prevent the caries progression in children. objectives: the aim of this study was to compare micro tensile bond strength of four glass-containing materials with primary teeth dentin. methods: 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. results: 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. conclusions: 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.