Abstract :
Aim: To evaluate the influence of a dual cured composite and resin modified glass ionomer usedas adentin substitute on the microleakage of Class II open-sandwich restorations.
Materials & Methods: Standardized Class II cavities wereprepared on 50extracted human third molars. The teeth were randomly assigned to two groups (n=20) to compare a dualcure composite (Core X flow) with resin-modified glass-ionomer cement (Vitremer) in open sandwich restorations covered with light cure composite (Ceram. X duot). The teeth were then subjected to thermo cycling (5 to 55degrees, 500 cycles) with a dwell time of 15 secondsin electronically maintained water baths. The specimens were sealed with sticky wax at the root apices. Teeth were coated with two layers of nail vamish, leaving 1.0 mm around the margins of the cavity. Samples were immersed in 2% methylene blue solution for 24hrs. The teeth were sectioned longitudinally and dye penetration was directly measuredusing stereomicroscope. Kruskal-Wallis and Mann- Whitney Utest was applied to seethe significance ofmean 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 open- sandwich restorations are indicated.
Keyword :
Core X. flow, Vitremer, Open-Sandwich technique, Dye leakage.