Comparative study of Microtensile Bond Strength of Zirconomer, Conventional and Resin Modified Glass Ionomer

Abstract

Purpose: The aim of this study was to compare the microtensile bond strength of zirconomer to conventional and resin modified glass ionomers bonded to enamel and dentin substrates. Materials and Methods: 30 molars were enrolled in this study, they were divided into three groups according to the type of glass ionomer used (each 10 teeth):A1: conventional, A2: resin modified, and A3: zirconia infused glass ionomer. Each group was subdivided into two subgroups (each 5 teeth) according to the substrate that the material was bonded. B1: enamel substrate, B2: dentin substrate. After preparation of flat enamel and dentin specimens, glass ionomers were manipulated and bonded to the substrates according to its subgrouping. Specimens were sectioned vertically to obtain beams of 1 mm2 thickness, then two central beams were selected randomly from each group to have a total of 60 beams, then each beam was subjected to microtensile bond strength test. Results ANOVA test revealed a statistically significant difference between groups. The highest mean value was recorded in resin modified glass ionomer bonded to dentin, followed by Resin modified glass ionomer bonded to enamel, zirconomer bonded to enamel, conventional glass ionomer bonded to enamel, then zirconomer bonded to dentin, with the least value was recorded in conventional glass ionomer bonded to dentin Conclusions: The microtensile bond strength of resin modified glass ionomer bonded to both substrates was the strongest. Zirconomer and conventional types were approximately of equal strength and zirconomer showed the highest strength when it bonded to enamel.