Distrontium Cerate as a Radiopaque Component of Hydraulic Endodontic Cement.

This study aimed to synthesize distrontium cerate (2SrO·CeO 2 : S 2 Ce) and evaluate its properties as an alternative component of the endodontic cement. S 2 Ce cement was prepared through calcination of strontium hydroxide and cerium carbonate. Subsequently, the crystal phase was confirmed using X-ray diffraction. S 2 Ce cement exhibited a rapid setting time (121 min) and achieved a high compressive strength (72.1 MPa) at 1 d after mixing, comparable to the compressive strength of a commercial mineral trioxide aggregate (MTA) cement (ProRoot MTA) after 28 d post mixing. However, the compressive strength decreased after 28 d of storage when the W/P ratio was 0.30-0.40 ( p < 0.05). Ion dissolution test of the S 2 Ce cement showed that strontium ions were released after immersion in water (5.27 mg/mL after 1 d), whereas cerium dissolution was not detected. S 2 Ce exhibited approximately three times higher radiopacity (9.0 mm aluminum thickness equivalent) compared to the commercial MTA ( p < 0.05). These findings suggest that S 2 Ce is a possible component for hydraulic endodontic cement that demonstrates a rapid setting and high radiopacity.