Influence of radiopaque fillers on physicochemical properties of a model epoxy resin-based root canal sealer

Objective: to verify the influence of radiopaque fillers on an epoxy resin-based sealer. material and methods: experimental sealers were formulated by adding 20%,40%,60%,80%,100% and 120% of calcium tungstate,ytterbium trifluoride or barium sulphate by weight to an epoxy-resin-base. setting time,flow,film thickness,radiopacity,sorption,solubility,ph and push-out bond strength were evaluated. results: the setting time ranged from 373 to 612.66 min,the flow varied from 13.81±0.49 to 22.49±0.37 mm,and the film thickness ranged from 16.67±5.77 to 33.33±11.54 μm. the lowest ph was 5.47±0.53,and the highest was 6.99±0.03. radiopacity varied from 0.38±0.04 to 2.57±0.21 mmal and increased with the amount of filler. calcium tungstate sealers had a higher sorption and solubility than other sealers. there was no significant difference in the push-out bond strength among the fillers at the 120% concentration. conclusion: the inorganic fillers evaluated and their concentrations affect the physicochemical properties of an epoxy resin-based root canal sealer.