PHYSICAL PROPERTIES OF CALCIUM SILICATE CEMENT WAS INFLUENCED BY RADIOPACITY AGENT AND/OR ANTI-WASHOUT ADMIXTURE

抄録

Introduction: The goal of the present study was to improve the poor handling of calcium silicate cement (CSC) and to develop materials that can be used as root canal sealing materials by adding a radiopacity agent (RA), Bi₂O₃ or Ta₂O₅, and/or an anti-washout admixture (methylcellulose, MC) with different molecular weight of MC (MC4000, 400, 25). We examined the radiopacity, flow, and setting time according to ISO 6876-2012.

Methods: Samples for the radiopacity test were prepared by adding RA to Portland cement (PC) up to final concentrations (%) of 0, 5, 10, 15, 20, and 25, respectively. Samples for the flow and setting time tests were prepared using mineral trioxide aggregate as a control group. In test groups, final concentrations of 18% RA and 2% MC, or 20% RA alone were added to PC. All of the methods in the present study conform to ISO 6876-2012.

Results: A radiopacity test revealed that the radiopacity of PC containing over 10% volume of each RA was higher than or equal to standard radiopacity. PC containing Ta2O5 and the MC25 group passed a flow and setting time test.

Conclusions: Bi₂O₃ and Ta₂O₅ can be used similarly in radiopacity, flow value and setting time test. The flow and setting time of CSC varied significantly with the molecular weight of the added MC.