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1.新疆大学机械工程学院, 830047,乌鲁木齐
2.华中科技大学材料科与技术系, 430074,武汉
Received:18 November 2024,
Online First:22 January 2025,
Published:10 June 2025
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ZHAO Yue, ZHAO Yinan, XU Yan, et al. Preparation and Performance Optimization of Biodegradable Bioceramics for Bone Repair[J]. Journal of Xi’an Jiaotong University, 2025, 59(6): 82-92.
ZHAO Yue, ZHAO Yinan, XU Yan, et al. Preparation and Performance Optimization of Biodegradable Bioceramics for Bone Repair[J]. Journal of Xi’an Jiaotong University, 2025, 59(6): 82-92. DOI: 10.7652/xjtuxb202506009.
针对骨修复应用中硅酸钙存在机械强度不足的问题,通过化学沉淀法,制备了一种掺镁硅酸钙陶瓷材料,并构建了兼具良好机械强度和生物相容性的骨修复支架。首先,向硅酸钙粉体中引入不同质量分数的镁粉末颗粒,并改变镁与硅酸钙粉体的掺杂比例,通过球磨、脱脂烧结等工艺制备掺镁硅酸钙陶瓷材料;然后,采用3D打印数字光处理技术(DLP),打印内、外直径分别为2.8 mm和5 mm,高度为6 mm的空心圆柱,构建用于骨修复的骨支架;最后,采用力学实验、CCK-8细胞增殖检测和碱性磷酸酶检测(ALP),探究镁掺杂量对可降解生物陶瓷抗压强度和生物相容性的影响规律。实验结果表明:所构建掺镁硅酸钙支架的弹性模量为94~110 MPa,是硅酸钙支架弹性模量(33 MPa)的2.85~3.33倍;掺镁质量分数分别为5%和10%的掺镁硅酸钙支架细胞存活率为94%~97%,具有良好的生物相容性;掺镁质量分数分别为15%和20%的掺镁硅酸钙支架细胞存活率均低于70%,不利于细胞增殖;当掺镁质量分数为10%、烧结温度为1 000 ℃时,掺镁硅酸钙支架兼具最佳的力学性能和生物相容性。
In response to the insufficient mechanical strength of calcium silicate in bone repair applications
a magnesium-doped calcium silicate ceramic material was prepared using a chemical precipitation method
and a bone repair scaffold with both excellent mechanical strength and biocompatibility was constructed. First
magnesium powder particles with different mass fractions were introduced into the calcium silicate powder
and the doping ratio of magnesium to calcium silicate powder was adjusted. Magnesium-doped calcium silicate ceramic materials were prepared by ball milling and de-binding sintering and other processes. Then
a 3D printing digital light processing (DLP) technique was used to print hollow cylinders with inner and outer diameters of 2.8 mm and 5 mm respectively
and a height of 6 mm
to construct bone scaffolds for bone repair. Finally
mechanical tests
CCK-8 cell proliferation assays
and alkaline phosphatase (ALP) tests were conducted to explore the effects of magnesium doping on the compressive strength and biocompatibility of biodegradable bioceramics. The experimental results showed that the elastic modulus of the magnesium-doped calcium silicate scaffold ranged from 94 MPa to 110 MPa
which is 2.85 to 3.33 times that of the calcium silicate scaffold (33 MPa). The cell viability of magnesium-doped calcium silicate scaffolds with mass fractions of 5% and 10% ranged from 94% to 97%
indicating good biocompatibility. In contrast
scaffolds with magnesium mass fractions of 15% and 20% exhibited cell viability below 70%
which is unfavorable for cell proliferation. With a magnesium doping level of 10% and a sintering temperature of 1 000 ℃
the magnesium-doped calcium silicate scaffold achieved the optimal combination of mechanical properties and biocompatibility.
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