Physical-mechanical properties of Bis-EMA based root canal sealer with different fillers addition

AIM: To evaluate influence of three different filler particles on an experimental Bisphenol A ethoxylated dimethacrylate (Bis-EMA) based root filling material. MATERIALS AND METHODS: Resin-based endodontic sealers were produced using Bis-EMA, camphorquinone, ethyl 4-dimethylaminobenzoate (EDAB), N, N-dihydroxyethyl-p-toluidine (DHEPT), butylated hydroxytoluene (BHT), and benzoyl peroxide. The experimental groups were formulated adding 10, 20, 30, 40, and 50% of calcium tungstate (CaWO(4)), ytterbium trifluoride(YbF(3)), and tantalum oxide(Ta(2)O(5)). Flow, thickness, and radiopacity tests were conducted in accordance with ISO 6876. Sorption and solubility (SL) tests were conducted in accordance with ISO 4049, pH was measured with a pH meter, and degree of conversion (DC) was evaluated with Fourier transform infrared spectroscopy (FTIR). For radiopacity, two-way analysis of variance (ANOVA) and Tukey's multiple comparison test was performed. For DC analysis, one-way ANOVA and Tukey's multiple comparison test was performed. All statistical analyses were performed with a significance level of 5%. RESULTS: All groups showed lower flow with increased filler concentration. All groups showed film thickness values lower than 50μm, as ISO recommends, except CaWO(4)50% group (76.7μm). pH values varied from 5.95 (± 0.07) in YbF(3)40% group to 6.90 (± 0.07) in Ta(2)O(5)40% group. In the radiopacity test, YbF(3)30%, Ta(2)O(5)40%, and Ta(2)O(5)50% groups showed no statistical significant difference to 3mmAl. Ta(2)O(5) and YbF(3) groups in 10, 20, and 30% concentrations presented sorption and SL values as ISOrecommendation. Addition ofTa(2)O(5) and CaWO(4) decreased DC after 14 days. YbF(3) addition showed no difference in DC from control group. CONCLUSION: YbF(3) filler addition promoted higher properties compared to CaWO(4) and Ta(2)O(5) on Bis-EMA based root canal sealer.