Abstract: Objective To study the mechanical and chemical properties of novel calcium-magnesium phosphate cements(CMPCs). Methods Components of the CMPCs were analyzed by XRD and SEM. The physicochemical properties of the CMPCs were investigated, and the effects of different components on setting time, compressive strength, rate of degradation were studied. Results According to the analysis of XRD and SEM, CMPCs were composed of Ca3(PO4)2, Mg3(PO4)2 and HA, and a small amount of unreacted MgO was also observed. It showed that with the increasing amount the CMPCs exhibited shorter setting time and higher compressive strength than the CPC. In addition, CMPCs showed significantly improved degradability compared with the CPC in SBF. Conclusion CMPCs possess a significant clinical advantage over CPC, and it might have the value of in-depth study as dental restorative material.

Key words: calcium phosphate cement, magnesium phosphate cement, setting time, Compressive strength, Degradation