Microstructure development of Ti scaffold by laser powder bed fusion with chemical polishing and its mechanical properties, biocompatibility

IF 1.6 Q4 ENGINEERING, BIOMEDICAL
Changfu Lu, Jing Chen, Teng Ma, Yuxin Chen, Da Zeng, Yiliang Gan, Youwen Yang
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Abstract

Titanium (Ti) dental scaffolds are widely used in dental prosthetics due to their excellent mechanical properties and biocompatibility. However, conventional Ti scaffolds manufactured through machining often do not fit perfectly with the bone defect site. Laser powder bed fusion (LPBF) technology enables the personalised manufacturing of custom-made Ti scaffolds. A custom-made Ti scaffold was prepared using LPBF and its surface roughness was improved through chemical polishing. To enhance the surface roughness, a nitric acid mixed solution with a specific composition of HF: HNO3:C3H6O3 = 2:2:3 was used. The polishing mechanism was investigated by adjusting the F/Ti ratio to control the formation and dissolution of the oxide film. As a result, the surface of the Ti scaffold after polishing exhibited a smooth and flat appearance compared to the LPBF part, with a reduced surface roughness (Ra) of 1.23 ± 0.19 μm. The custom-made Ti scaffold also demonstrated favourable mechanical properties, with a bending strength of 335.18 ± 33.62 MPa and stiffness of 2.13 ± 0.21 GPa. Furthermore, in vitro cell tests confirmed the excellent biocompatibility of the custom-made Ti scaffold. The authors present a feasible strategy for the further clinical application of custom-made Ti scaffolds, offering enhanced surface properties and addressing the limitations of conventional machining methods.

Abstract Image

通过激光粉末床熔融与化学抛光技术开发钛支架的微结构及其机械性能和生物相容性
钛(Ti)牙科支架因其出色的机械性能和生物相容性而被广泛应用于牙科修复。然而,通过机械加工制造的传统钛支架往往不能完全贴合骨缺损部位。激光粉末床融合(LPBF)技术实现了定制钛支架的个性化制造。利用 LPBF 制备了定制的钛支架,并通过化学抛光改善了其表面粗糙度。为了提高表面粗糙度,使用了硝酸混合溶液,具体成分为 HF: HNO3:C3H6O3 = 2:2:3。通过调整 F/Ti 比率来控制氧化膜的形成和溶解,从而研究了抛光机理。结果,与 LPBF 部分相比,抛光后的钛支架表面光滑平整,表面粗糙度(Ra)降低到 1.23 ± 0.19 μm。定制的钛支架还表现出良好的机械性能,弯曲强度为 335.18 ± 33.62 兆帕,刚度为 2.13 ± 0.21 GPa。此外,体外细胞测试证实了定制钛支架具有良好的生物相容性。作者为定制钛支架的进一步临床应用提出了一种可行的策略,它能提供更好的表面特性,并解决传统加工方法的局限性。
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来源期刊
Biosurface and Biotribology
Biosurface and Biotribology Engineering-Mechanical Engineering
CiteScore
1.70
自引率
0.00%
发文量
27
审稿时长
11 weeks
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