Comparative Evaluation of Marginal Integrity and Microleakage in Nanoionomer and Low Shrinkage Posterior Composite Restorative Materials: An In Vitro Study

Restorative dentistry had shown considerable progress, leading to the development of improved tooth-colored restorative materials. The main concern regarding these refers to the durability and integrity of marginal sealing. The aim of this study was to evaluate and correlate microleakage and marginal integrity of silorane based low shrinkage posterior composite with nano-filled resin modified glass ionomer cement (RMGIC). In this in vitro study, Class V cavity preparations were made and the specimens were divided into two equal groups. Specimens in Group I were restored with silorane based (Filtek P90)TM and Group II with nano filled RMGIC (Ketac N 100).TM Specimens were subjected to thermocycling and later sectioned using hard tissue microtome. Microleakage was evaluated under a stereomicroscope and later scanning electron microscope is used to assess the marginal adaptation. The obtained values were tabulated and subjected to statistical analysis. Silorane based composite demonstrated least microleakage with a mean score of 0.25 and the interface gap of 2.46 compared with nanoionomer with mean microleakage score of 0.44 and interface gap of 14.73, respectively. Silorane based low shrinkage posterior composite (Filtek P90) exhibited adequate resistance to microleakage and better interface gap than nano-filled RMGICs. Considering the limitations of the in-vitro studies, it can be clinically correlated that Filtek P90 has better marginal properties than Ketac N 100.