不同制备条件对EH复合型骨水泥抗弯强度的影响

目的 探讨不同制备条件对EH 复合型骨水泥抗弯强度的影响.方法 分别选择EH 复合型骨水泥的不同粉/液比、不锈钢模具内充填后使用/未使用冲压器固定、试样加热/不加热3 种不同条件制备试样,随后进行抗弯强度测试.结果 不同的粉/液比中,6/4 和10/7 两组间的抗弯强度差异无统计学意义(P=0.05),其余组别之间有显著差异(P<0.05);使用/未使用冲压器试样(粉/液比:10/7)两组抗弯强度值之间有显著性差异(P<0.05);使用/未使用热处理试样(粉/液比10/7, 使用冲压器)抗弯强度, 两组数据间没有显著性差异(P>0.05).结论 当粉/液比为10/7、且使用冲压器固定条件下制备的EH 复合型骨水泥试样,其抗弯强度可达到最大;对试样进行热处理,抗弯强度的变化不显著.

Effect of different preparation conditions on the bending strength of EH composite bone cement

Objective To evaluate the effect of different preparation condition on the bending strength of EH composite bone cement. Method Three kinds of methods were used to prepare the EH composite bone cement: 1) the samples were made by different ratio of powder/liquid; 2) the samples were filled into the stainless steel mould and then fixed with/without the punch device; 3) the samples were heated/not heated. And then, the bending strength of all samples were measured. Result In the case of different Powder/Liquid ratio, there was no statistically significant difference (P=0.05) in the bending strength between the 6/4 group and 10/7 group, while there were obvious differences (P<0.05) among other groups. In the case of punch device (powder/liquid ratio: 10:7), there was significant difference (P<0.05) in bending strength between the samples prepared with/without punch machine. Moreover, there was no obvious difference (P>0.05) in bending strength between the sample with/without heat-treatment. Conclusion When the ratio of Powder/liquid agent was 10/7 and punch machine was used to fix the metallic mould, the EH composite bone cement had the best effect on the bending strength. Moreover, heat-treatment had no obvious change on bending strength.