Quantitative Evaluation by Glucose Diffusion of Microleakage in Aged Calcium Silicate-Based Open-Sandwich Restorations

摘要

This study compared the in vitro marginal integrity of open-sandwich restorations based on aged calcium silicate cement versus resin-modified glass ionomer cement. Class II cavities were prepared on 30 extracted human third molars. These teeth were randomly assigned to two groups (n = 10) to compare a new hydraulic calcium silicate cement designed for restorative dentistry (Biodentine, Septodont, Saint Maur des Fossés, France) with a resin-modified glass ionomer cement (Ionolux, Voco, Cuxhaven, Germany) in open-sandwich restorations covered with a light-cured composite. Positive (n = 5) and negative (n = 5) controls were included. The teeth simultaneously underwent thermocycling and mechanocycling using a fatigue cycling machine (1,440 cycles, 5–55°C; 86,400 cycles,50 N/cm²). The specimens were thenstored in phosphate-buffered saline to simulate aging.After 1 year, the teeth were submitted to glucosediffusion, and the resulting data were analyzed with anonparametric Mann-Whitney test. The Biodentine groupand the Ionolux group presented glucose concentrationsof 0.074 ± 0.035 g/L and 0.080 ±0.032 g/L, respectively. No statisticallysignificant differences were detected between the twogroups. Therefore, the calcium silicate-based materialperforms as well as the resin-modified glass ionomercement in open-sandwich restorations.