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The effect of temperature on rheological properties of endodontic sealers

Aim: The purpose of this study was to investigate temperature-dependent rheological properties of three endodontic sealers MTA Fillapex (Angelus, Brazil), AH Plus (Dentsply, Germany), and EndoREZ (Ultradent, USA). Materials and Methods: Five samples of each group of endodontic sealers (n = 30) were freshly mixed and placed on the plate of a rheometer (MCR 301, AntonPaar, Physica) and examined at 25° C and 37° C temperature, respectively. Rheological properties of the sealers were calculated according to the loss modulus (G"), storage modulus (G′), loss factor (Tan δ), and complex viscosity (çFNx01) using dynamic oscillatory shear tests. Results: Statistical analysis (Wilcoxon signed-rank test) demonstrated that MTA Fillapex exhibited higher loss modulus (G" > G′) and a crossover region. AH Plus and EndoREZ had a higher storage modulus (G′ > G") at both temperatures. Loss factor (Tan δ) of MTA Fillapex was the highest compared to AH Plus, followed by EndoREZ. With a temperature change from 25°C to 37°C, MTA Fillapex exhibited a decrease while AH Plus exhibited an increase and, EndoREZ exhibited the least change, in complex viscosity (çFNx01 ). Conclusions: EndoREZ exhibited better rheological properties compared to the other two test sealers.