Comparative evaluation of microleakage in Class V cavities restored with giomer, resin-modified glass ionomer, zirconomer and nano-ionomer: An In vitro study

Aims and Objective: Clinically, microleakage is the major cause for the failure of restorations in Class V cavities which may cause postoperative sensitivity and secondary caries. The newer generation of glass ionomers has been introduced in market with superior characteristics compared to conventional glass ionomers. The aim of this study was to evaluate the adaptability of new novel restorative material Nano-ionomer with resin-modified glass ionomer, Zirconomer, Giomer to tooth surface by measuring the degree of microleakage at gingival and occlusal restorative margins of Class V cavities and compare the same among the groups using stereomicroscopic study. Methodology: A total of 60 Class V cavities were prepared with occlusal margin in enamel, and the cervical margin in dentin and cementum of sound extracted premolars. Restorations were randomly assigned to one of the four groups ( n = 15) and were restored with various type of glass ionomers (resin-modified glass-ionomer cements [RMGIC], Zirconomer, Giomer, Nano-ionomer), respectively. Specimens were thermocycled, immersed in Methylene blue dye, sectioned longitudinally and analyzed for leakage at the occlusal and cervical interfaces. Analysis of variance test, followed by post hoc Bonferroni Test was used to determine the inter- and intra-group difference and Paired t -test was used to determine the significant difference at enamel and cementum margins. Results: The intergroup comparison of occlusal and gingival scores showed a significant difference between RMGIC and Giomer, Zirconomer and Nano-Ionomer and Giomer and Nano-Ionomer ( P Conclusion: It was concluded that all the restorative materials tested shows microleakage to an extent. Nano-ionomer was better than the other three types of glass ionomers in reducing the microleakage.