摘要
目的筛选生物力学相容性优良的颌骨内植入用多孔镍钛合金。方法采用常规粉末烧结法制备不同孔径多孔镍钛合金,用金相显微镜观察孔隙形貌,万能试验机测定弹性模量及压缩强度。结果金相显微镜下见孔隙主要由相互连通的大孔和微孔组成,试件孔径范围在(89.5±45.4)～(735.0±82.3)μm;弹性模量为(7.2±0.3)～(9.2±0.3)GPa,压缩强度值为(595.3±41.4)～(889.1±56.4)MPa;随着造孔剂粒径增加,材料孔径增大,力学性能呈下降趋势(P<0.05)。结论孔径对颌骨内植入用多孔镍钛合金弹性模量及压缩强度有影响,造孔剂为50～200μm时,多孔镍钛合金压缩强度最大,且弹性模量与颌骨骨质弹性模量接近,能够满足植入体力学性能的基本要求。
Objective To study the effect of different pore size on Young＇s modulus and compressive strength of porous Nickel-Titanium（NiTi） alloy.Methods The porous NiTi specimens were fabricated by the method of powder metallurgy with NH4HCO3 powder served as the temporary space-holder and pore size regulator.The microsurface characteristics and pore morphology were observed by metallographic microscopy.Young＇s modulus and the compressive strength were measured by a universal testing machine.Statistical analyses were performed by the computerized statistical package SPSS 16.0.Results The porous NiTi specimens exhibited three-dimensionally interconnected,permeable and open structures with the pore size ranged from（89.5 ± 45.4）μm to（735.0 ± 82.3）μm.Young＇s modules of the specimens were between（7.2 ± 0.3）GPa and（9.2 ± 0.3）GPa,and the compressive strength were from（595.3 ± 41.4）MPa to（889.1 ± 56.4）MPa.The Young＇s modules and compressive strength of porous NiTi specimens decreased gradually with the increase of the pore size（P 0.05）.Conclusions Pore size of porous NiTi alloy has a significant impact on the Young＇s modulus and compressive strength.When the size of the space-holder is about 50-200 μm,the porous NiTi specimens possess the best compressive strength.
出处
《中华口腔医学研究杂志（电子版）》
CAS
2011年第3期25-28,共4页
Chinese Journal of Stomatological Research(Electronic Edition)
基金
国家自然科学基金(50671037
50871039)
关键词
镍钛
多孔
生物力学性能
NiTi
Porous material
Biomechanical properties
