共查询到19条相似文献,搜索用时 93 毫秒
1.
2.
3.
4.
58S生物玻璃陶瓷的力学性能及体外生物活性 总被引:3,自引:1,他引:3
以溶胶-凝胶58S生物玻璃为原料在1200℃煅烧制备了玻璃陶瓷块体。与700℃煅烧的玻璃(58S-700)相比,1200℃煅烧后的玻璃陶瓷(58S-1200)显示出较高的抗弯强度和致密度,X射线衍射分析其结晶相主要为硅灰石和二氧化硅。体外模拟体液浸泡实验表明:58S-700玻璃和58S-1200玻璃陶瓷都能诱导羟基磷灰石的沉积。体外成骨细胞培养结果显示:58S-700玻璃有利于细胞早期贴附,而58S-1200玻璃陶瓷较低的离子释放速度对细胞后期增殖有利。研究结果表明:58S-1200玻璃陶瓷不仅能诱导羟基磷灰石沉积,而且具有良好的细胞相容性和较高的力学强度,有可能成为一种骨替代和修复材料。 相似文献
5.
6.
医用双相磷酸钙(BCP)陶瓷是β-磷酸三钙(β-TCP)和羟基磷灰石(HA)的复合体,其成分与骨矿物组成类似。它具有良好的生物相容性,在生物医学领域具有非常广阔的应用前景。且在生理环境下能发生不同程度的降解,被组织吸收。通过化学沉淀法制备纳米羟基磷灰石,然后通过可溶性钙盐和磷酸盐反应工艺制得β-磷酸三钙,最后将二者进行机械复合而制得双相磷酸钙,将所得样品用X射线衍射仪(XRD)进行了表征。结果显示:所得的双相磷酸钙中掺杂有β-焦磷酸钙,但是它的结晶较好,并且可以改善双相磷酸钙陶瓷的力学性能。 相似文献
7.
8.
骨组织工程支架材料磷酸钙双相生物陶瓷的研究进展 总被引:5,自引:0,他引:5
双相磷酸钙(biphasic calcium phosphate,BCP)生物陶瓷材料在整型外科领域是一类重要的骨修复材料。该材料由稳定相羟基磷灰石(hydroxyapatite,HA)和可溶解相β-磷酸三钙(β-tricalcium phosphate,β-TCP)双相平衡优化得到,其生物活性及生物降解性可调。模拟人体自然骨结构的多孔型BCP适宜细胞及骨组织的长入,是一类优异的骨组织工程支架材料。概述了BCP生物陶瓷材料的研究历史、制备工艺及材料表征;评价了多孔型BCP陶瓷的孔隙结构、力学性能及生物学性能;综合了多孔型BCP陶瓷作为骨组织工程支架材料的研究方向;并展望了组织工程化的BCP支架材料的研究未来。 相似文献
9.
磷酸钙类陶瓷其成分与骨矿物组成类似,生物相容性好,被视为典型的生物陶瓷,它们在生理环境下能发生不同程度的降解,被组织吸收,这种特性与材料的化学成分,结晶相,结合形态等材料学因素有关,同时也与宿主个体差异,植入部位,与骨接触方式等生物学因素有关,目前主要的研究方法有体外模拟实验及体内埋植实验,通过观测材料结构,性能及成分的变化,与骨界面结合状态,细胞学,组织学等,探讨陶瓷的生物降解机理及控制降解的途径,以寻找新型骨修复材料。 相似文献
10.
11.
Md Towhidul Islam Kazi M. Zakir Hossain Nusrat Sharmin Andrew J. Parsons Ifty Ahmed 《International Journal of Applied Glass Science》2017,8(4):391-402
A series of phosphate glasses 40P2O5-(40−x)CaO-xMgO-(20−y)Na2O-yTiO2 (where 0 ≤ x ≤ 24 and y = 0 or 1) with varying MgO contents were investigated for their in vitro calcium phosphate (CaP) formation. Thermal analysis of these glass compositions was conducted and a significant decrease in glass transition temperature from 448°C to 430°C was seen with reducing MgO content from 24 to 8 mol%. Degradation studies were performed in phosphate buffered saline (PBS) at 37°C, where the 8 mol% MgO glass showed the highest mass loss of around 3.4% after 28 days of immersion. Cation release studies were conducted via ion chromatography, using ultrapure water at 37°C as the degradation medium. The highest release of Ca2+ and Na+ ions was observed with the 8 mol% MgO glass. In vitro CaP formation studies were conducted using glass discs immersed in simulated body fluid (SBF) at 37°C for up to 28 days. The amorphous phase and chemical composition of deposited CaP layers on the glass discs were confirmed via X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX) analysis, respectively. CaP layers with Ca/P ratio 0.8-1.1 were found to be deposited on the lower MgO content (8 to 2 mol%) glass surface after 28 days of SBF study. 相似文献
12.
用模拟体液(simulated body fluid,SBF)作为固化液,对磷酸四钙(TTCP)+一水磷酸二氢钙(MCPM)+β-磷酸三钙(β -TCP)系骨水泥理化性质进行研究.结果表明,随液固比增大,抗压强度先增加后降低,当液固比为0.445时,抗压强度达到最大值15.23 MPa;骨水泥固化较快,液固比为0.594时,t_f为12 min;随着浸泡时间的增加抗压强度逐渐减小;X射线(XRD)和扫描电镜(SEM)分析结果显示,随液固比改变,固化反应结晶物均有羟基磷灰石(HA)相出现;浸泡后的骨水泥没有新物相产生. 相似文献
13.
14.
Hirotaka Mutsuzaki Yoshiro Yokoyama Atsuo Ito Ayako Oyane 《International journal of molecular sciences》2013,14(9):19155-19168
A plasma- and precursor-assisted biomimetic process utilizing plasma and alternate dipping treatments was applied to a Leed-Keio artificial ligament to produce a thin coating of apatite in a supersaturated calcium phosphate solution. Following plasma surface modification, the specimen was alternately dipped in calcium and phosphate ion solutions three times (alternate dipping treatment) to create a precoating containing amorphous calcium phosphate (ACP) which is an apatite precursor. To grow an apatite layer on the ACP precoating, the ACP-precoated specimen was immersed for 24 h in a simulated body fluid with ion concentrations approximately equal to those in human blood plasma. The plasma surface modification was necessary to create an adequate apatite coating and to improve the coating adhesion depending on the plasma power density. The apatite coating prepared using the optimized conditions formed a thin-film that covered the entire surface of the artificial ligament. The resulting apatite-coated artificial ligament should exhibit improved osseointegration within the bone tunnel and possesses great potential for use in ligament reconstructions. 相似文献
15.
生物活性玻璃多孔材料的制备及性能研究 总被引:2,自引:0,他引:2
采用溶胶-凝胶法制备生物活性玻璃58S及77S;通过熔融法制备生物活性玻璃45S5,分别向上述3种生物活性玻璃粉体以及它们的混合物中添加一定比例的造孔剂,通过一定的烧结工艺制成具有不同组成的生物活性多孔材料,利用体外实验方法结合DTA,SEM及FTIR等材料显微结构及性能研究手段分析比较了各种多孔材料的显微结构、表面形貌、抗折强度及生物活性.研究表明:58S和45S5混合制备的多孔材料是一种具有良好生物活性和生物矿化特性的生物材料,可用于制备骨缺损填充材料和骨组织工程支架. 相似文献
16.
《Ceramics International》2022,48(16):22647-22663
Calcium phosphates (apatites) are considered as a research frontier for bone regeneration applications by virtue of similarity to the mineral constituent of bone, suitable biocompatibility and remarkable osteogenesis ability. In this regard, the biodegradability and mechanical properties of monophasic apatites, typically hydroxyapatite (HA) and tricalcium phosphate (TCP), are imperfect and do not fulfill some requirements. To overcome these drawbacks, 3D porous HA/TCP composite scaffolds prepared by conventional and more recently, 3D printing techniques have shown to be promising since their bioperformance is adjustable by the HA/TCP ratio and pores. Despite the publication of several reviews on either 3D porous scaffolds or biphasic calcium phosphates (BCPs), no review paper has to our knowledge focused on 3D porous BCP scaffolds. This paper comprehensively reviews the production methods, properties, applications and modification approaches of 3D porous HA/TCP composite scaffolds for the first time. In addition, new insights are introduced towards developing HA/TCP scaffolds with more impressive bioperformance for further tissue engineering applications, including those with different interior and exterior frameworks, patient-specific specifications and drugs (or other biological factors) loading. 相似文献
17.
18.