Influence of a Dual-Cure Composite and Resin-Modified Glass Ionomer Cement used as a Dentin Substitute on the Microleakage of Class II Open-Sandwich Restorations

for Dental Studies and Research Murad Nagar, Ghaziabad,U.P (M) : 9910113023, E-mail address: [email protected] Abstract Aim: To evaluate the influence of a dual cured composite and resin modified glass ionomer used as a dentin substitute on the microleakage of Class II open-sandwich restorations Materials & Method: Standardized Class II cavities were prepared on 50 extracted human third molars. The teeth were randomly assigned to two groups (n=20) to compare a dual cure composite (Core X. flow) with resin-modified glass-ionomer cement (Vitremer) in open sandwich restorations covered with light cure composite (Ceram.X duo+). The teeth were then subjected to thermocycling (5 to 55 degrees, 500 cycles) with a dwell time of 15 seconds in electronically maintained water baths. The specimens were sealed with sticky wax at the root apices. Teeth were coated with two layers of nail varnish, leaving 1.0 mm around the margins of the cavity. Samples were immersed in 2% methylene blue solution for 24 hrs. The teeth were sectioned longitudinally and dye penetration was directly measured using stereomicroscope. Kruskal-Wallis and MannWhitney U test was applied to see the significance of mean of dye leakage. Results: The degree of leakage increased significantly with Core X. flow compared to Vitremer. The resin-modified glass-ionomer cement remained the best intermediate materials when opensandwich restorations are indicated.