The effect of temperature on rheological properties of endodontic sealers.
OBJECTIVE
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).


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 (η*) 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 (η*).


CONCLUSIONS
EndoREZ exhibited better rheological properties compared to the other two test sealers.
Department of Conservative Dentistry and Endodontics, KM Shah Dental College and Hospital, Vadodara, Gujarat, India.
Roshni U
RU
Rai
Department of Conservative Dentistry and Endodontics, KM Shah Dental College and Hospital, Vadodara, Gujarat, India.
Kiran P
KP
Singbal
Department of Conservative Dentistry and Endodontics, KM Shah Dental College and Hospital, Vadodara, Gujarat, India.
Vaishali
V
Parekh
Endodontic sealers; rheology; viscoelasticity