title: The effect of setting accelerator on properties of mineral trioxide aggregate.
abstract: The purpose of this study was to investigate the effect of a sodium phosphate dibasic (Na2HPO4) setting accelerator on the properties of white-colored mineral trioxide aggregate (WMTA). Setting times were measured by using a Gilmore needle. Changes in the pH value, diametral tensile strength, and phase composition of WMTA were evaluated. By using a 15% Na2HPO4 solution as a liquid phase mixed with WMTA, the setting time was significantly reduced to 26 minutes rather than the usual 3 hours. The 15% Na2HPO4 promoted WMTA to achieve a maximum diametral tensile strength of 4.9 MPa at an initial 6-hour aging time and 1 MPa for the cement mixed with water. The pH value of the 15% Na2HPO4-mixed cement was changed from an initial 11.0 to a high of 13.2, which was similar to the results using water. The results suggest that the Na2HPO4 solution may be an effective setting accelerator for WMTA.
authors.affiliation: Institute of Stomatology, Chung-Shan Medical University, Taichung, Taiwan, Republic of China.
authors.forename: Tsui-Hsien
authors.initials: TH
authors.lastname: Huang
authors.forename: Ming-You
authors.initials: MY
authors.lastname: Shie
authors.forename: Chia-Tze
authors.initials: CT
authors.lastname: Kao
authors.forename: Shinn-Jyh
authors.initials: SJ
authors.lastname: Ding
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D003799:Dental Stress Analysis; D004338:Drug Combinations; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry*; D044367:Phase Transition; D010710:Phosphates; D012387:Root Canal Filling Materials / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D012996:Solutions; D013718:Tensile Strength; D013997:Time Factors; D014867:Water
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D010087:Oxides; D010710:Phosphates; D012387:Root Canal Filling Materials; D017640:Silicates; D012996:Solutions; C086631:mineral trioxide aggregate; D014867:Water; C018279:sodium phosphate