Division of Bioengineering & Biomaterials, Interdepartment Research Group for the Applied Scientific Collaboration, Technical University of Catalonia (UPC), Avda. Diagonal 647, 08028, Barcelona, Spain.
J Mater Sci Mater Med. 2012 Jul;23(7):1563-8. doi: 10.1007/s10856-012-4636-0. Epub 2012 Apr 8.
In this study, the setting of calcium-sulphate (CS) and -phosphate (CP) based bone cements (BCs) was monitored by ultrasound. The objective was to link acoustic and material properties of ceramic-based BCs from the early stages of the cement curing process. The powder phase of the CS-cement consisted of CS hemihydrate; the CP-cement was a mixture of alpha-tricalcium phosphate, CS dihydrate and hydroxyapatite. For the CS-cement, the acoustic impedance z (c)(t), the speed of sound c (c)(t) and the density ρ(c)(t) were measured at the interval of liquid-to-powder ratios LPRs from 0.20 to 3.00 ml/g. For the CP-cement, the acoustic characteristics obtained were the z (c)(t) and the reflection coefficient R (p,c)(t), and the LPRs ranged from 0.30 to 0.40 ml/g. The resulting acoustic properties indicated that CP- and CS-cements exhibited distinctly different curing behaviour; while CS-cement expanded, CP-cement shrank with time.
在这项研究中，通过超声监测硫酸钙（CS）和磷酸钙（CP）基骨水泥（BC）的凝固过程。目的是将陶瓷基 BC 从水泥固化过程的早期阶段开始的声学和材料性能联系起来。CS 水泥的粉末相由 CS 半水合物组成；CP 水泥是α-磷酸三钙、CS 二水合物和羟基磷灰石的混合物。对于 CS 水泥，在液体与粉末比（LPR）间隔为 0.20 至 3.00 ml/g 的情况下，测量了声学阻抗 z(c)(t)、声速 c(c)(t)和密度 ρ(c)(t)。对于 CP 水泥，获得的声学特性是 z(c)(t)和反射系数 R(p,c)(t)，LPR 范围为 0.30 至 0.40 ml/g。得出的声学特性表明 CP 和 CS 水泥表现出明显不同的固化行为；CS 水泥膨胀，CP 水泥随时间收缩。
