Abstract
Octacalcium phosphate (OCP) setting for dental applications was prepared by mixing monocalcium phosphate monohydrate and calcium carbonate with sodium hydrogen phosphate buffer (pH=7.4). The OCP setting was improved in its mechanical properties by the addition 0f α-tricalcium phosphate (α-TCP). The setting with 69.0nass% α-TCP had a maximal compressive strength of 12.0MPa which was about 7 times higher than that of the α-TCP free setting at 7 days after mixing. Based on the data shown by SEM, the significant improvement was attributed to both the decreasing porosity induced by the increase in direct connection between the grains and the uniformity in its microstructure. The OCP setting with 69.0 mass% α-TCP transformed into brushite (DCPD) 1 day after mixing in simulated body fluid, and changed into the OCP and HAp at 6 weeks after mixing. The OCP setting with 69.0 mass% α-TCP was suggestted to be applicable to endodontic treatment in dentistry.
