Diametral Tensile Strength and Compressive Strength of a Calcium Phosphate Cement: Effect of Applied Pressure

Published

October 1, 2000

Author(s)

Laurence C. Chow, S Hirayama, S. Takagi, Edward E. Parry

Abstract

The diametral tensile strength (DTS) and compressive strength (CS) of a calcium phosphate cement comprised of tetracalcium phosphate and dicalcium phosphate anhydrous were studied. Cement powder and water were mixed at a powder/liquid ratio of 4.0. The resulting cement pastes were placed in molds and a pressure ranging from 0 to 2.8 MPa was applied for various lengths of time (0.5 to 24 h). DTS and CS measurements were conducted on 24-h wet samples. The strength was found to be significantly (p<0.05) affected by the pressure but not by the time. Samples prepared under a pressure of 0.7 MPa had a mean DTS value of 10.8 1.0 (n = 5), which is comparable to the values reported in the literature for the same cement prepared under similar conditions. In contrast, the mean CS value obtained in the present study, 66.1 MPa (n = 5), was significantly higher than the value 51 MPa 4.5 MPa previously reported. The higher CS may be attributed to an improved mold design that may reduce sample damage during demolding and to the use of a loading device that applied a constant pressure to the sample during setting. The average standard deviation of the mean for the 19 DTS sample groups (n = 5 in each group) was 1.1 MPa, corresponding to 9.6% of the mean DTS value. The average standard deviation of the 7 CS sample groups (n = 5 in each group) was 4.5 MPa, corresponding to 7.1% of the mean CS value.

Citation

Journal of Biomedical Materials Research

Volume

53

Issue

No. 5

Pub Type

Journals

Keywords

biomaterials, calcium phosphate cement, compressive strength, constant pressure loading device, diametral tensile strength, hydroxyapatite, Dentistry

Citation

Chow, L. , Hirayama, S. , Takagi, S. and Parry, E. (2000), Diametral Tensile Strength and Compressive Strength of a Calcium Phosphate Cement: Effect of Applied Pressure, Journal of Biomedical Materials Research (Accessed October 22, 2025)