排序方式: 共有15条查询结果,搜索用时 37 毫秒
1.
目的 研究骨形态发生蛋白-2(BMP-2)复合明胶羟基磷灰石(HA)涂层多孔钛对兔股骨远端骨缺损的修复作用。方法 以多孔钛粉末为原料,制备三维多孔结构钛载体,然后运用碱热处理+模拟体液等化学方法进行HA涂层,制备具有三维空间结构的HA涂层多孔钛复合材料。36只新西兰兔随机分为实验组及对照组,制备股骨远端圆柱状骨缺损模型,实验组植入复合BMP-2的HA涂层多孔钛材料,对照组单纯植入HA涂层多孔钛材料。分别于6、12、24周取材通过组织学和生物力学分析。结果组织学观察显示于各时间点实验组骨生成均不同程度优于对照组;生物力学测试显示在推出实验中所有样品的剪切应力都随时间增长而增大。其中在6周、12周实验组多孔钛在所有时间点均表现出了比对照组高得多的剪切力(P〈0.05),在24周实验组和对照组差异无统计学意义(P〉0.05)。结论 BMP-2复合明胶HA涂层多孔钛较单纯HA涂层多孔钛植入早期具有更良好的生物相容性、骨传导性及骨诱导性,可成功修复兔股骨远端骨缺损。 相似文献
2.
3.
4.
Objective: To assess the osseointegration capability of hydroxyapatite-coated porous titanium with bone morphogenetic protein-2 (BMP-2) and hyaluronic acid to repair defects in the distal femur metaphysis in rabbits.
Methods: Porous titanium implants were made by sintering titanium powder at high temperature, which were coated with hydroxyapatite by alkali and heat treatment and with BMP-2 combined with bone regeneration materials. And hyaluronic acid was further used as delivery system to prolong the effect of BMP-2. The implants were inserted into the metaphysis of the distal femur of rabbits. The animals were killed at 6, 12 and 24 weeks to accomplish histological and biomechanical analyses.
Results: According to the result of histological analysis, the osseointegration in BMP-2 group was better than that of the HA-coated porous titanium group. In push-out test, all the samples had bigger shear stress as time passed by. There was statistical difference between the two groups in 6 and 12 weeks but not in 24 weeks.
Conclusion: Hydroxyapatite-coated porous titanium with BMP-2 and hyaluronic acid has a good effect in repairing defects of distal fumur in rabbits, which is a fine biotechnology for future clinical application. 相似文献
Methods: Porous titanium implants were made by sintering titanium powder at high temperature, which were coated with hydroxyapatite by alkali and heat treatment and with BMP-2 combined with bone regeneration materials. And hyaluronic acid was further used as delivery system to prolong the effect of BMP-2. The implants were inserted into the metaphysis of the distal femur of rabbits. The animals were killed at 6, 12 and 24 weeks to accomplish histological and biomechanical analyses.
Results: According to the result of histological analysis, the osseointegration in BMP-2 group was better than that of the HA-coated porous titanium group. In push-out test, all the samples had bigger shear stress as time passed by. There was statistical difference between the two groups in 6 and 12 weeks but not in 24 weeks.
Conclusion: Hydroxyapatite-coated porous titanium with BMP-2 and hyaluronic acid has a good effect in repairing defects of distal fumur in rabbits, which is a fine biotechnology for future clinical application. 相似文献
5.
6.
目的研究Ti6Al4V合金基体上经钎焊制得的多孔纯钛/钛合金,并对其各项性能进行表征,探讨其是否适用于人体关节植入物。方法制备钎焊多孔纯钛/钛合金表面多孔层,采用SEM观察其形貌及孔径,采用重量法计算其孔隙率,采用Instron 4057材料试验机进行结合强度测试,并根据国家标准GB/T16886-3完成遗传毒性实验。结果纯钛/钛合金多孔层孔径为100μm以上,孔隙率6%以上;多孔层与基体的结合强度达到27MPa。遗传毒性试验结果为阴性。结论经钎焊可制得纯钛/钛合金球形粉末多孔层,其孔隙率和孔径允许骨细胞长入;多孔层与基体的结合强度能够满足植入要求,并具有较好生物相容性;经钎焊制得的纯钛/钛合金多孔层是一种可用于人体关节植入物的表面结构形式。 相似文献
7.
8.
9.
10.
鹿茸中次黄嘌呤的超声辅助提取法研究 总被引:1,自引:0,他引:1
目的 建立超声辅助提取焙干鹿茸中次黄嘌呤的方法.方法 采用正交实验设计系统研究了试剂浓度、试剂体积、超声时间、超声温度对鹿茸中次黄嘌呤的提取产生的影响.结果 1.000 g焙干鹿茸样品用40 ml 50%乙醇60 ℃提取40 min时,提取液中次黄嘌呤含量最多.超声辅助提取鹿茸中的次黄嘌呤,采用反相高效液相色谱-紫外检测器进行测定,在1~30 mg/L浓度范围内,其峰面积与浓度具有良好的线性关系,加标回收率97.5%~102.9%.结论 超生辅助提取次黄嘌呤,反相高效液相色谱法测定可以快速、准确测定经焙干处理后鹿茸样品中次黄嘌呤的含量. 相似文献