Chow L C, Hirayama S, Takagi S, Parry E
American Dental Association Health Foundation, Paffenbarger Research Center, Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
J Biomed Mater Res. 2000 Sep;53(5):511-7. doi: 10.1002/1097-4636(200009)53:5<511::aid-jbm10>3.0.co;2-e.
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 0-2.8 MPa was applied for various lengths of time (0.5-24 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 MPa (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+/-5.0 MPa (n = 5), was significantly higher than the value (51+/-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. Published 2000 John Wiley & Sons, Inc.
对由磷酸四钙和无水磷酸二钙组成的磷酸钙骨水泥的径向抗张强度（DTS）和抗压强度（CS）进行了研究。将水泥粉末和水按4.0的粉液比混合。将所得的水泥浆体置于模具中，并在0 - 2.8 MPa的压力下施加不同的时间长度（0.5 - 24小时）。对24小时湿样品进行DTS和CS测量。发现强度受压力显著影响（p<0.05），但不受时间影响。在0.7 MPa压力下制备的样品的平均DTS值为10.8±1.0 MPa（n = 5），这与文献中报道的在类似条件下制备的相同水泥的值相当。相比之下，本研究中获得的平均CS值为66.1±5.0 MPa（n = 5），显著高于先前报道的值（51±4.5 MPa）。较高的CS可能归因于改进的模具设计，这可能减少脱模过程中的样品损坏，以及使用了在固化过程中对样品施加恒定压力的加载装置。19个DTS样品组（每组n = 5）的平均值的平均标准偏差为1.1 MPa，相当于平均DTS值的9.6%。7个CS样品组（每组n = 5）的平均标准偏差为4.5 MPa，相当于平均CS值的7.1%。2000年由约翰威立父子公司出版。
