Enhancing osseointegration of titanium implants through large-grit sandblasting combined with micro-arc oxidation surface modification
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The demand for titanium dental implants has risen sharply. However, the clinical success rate of implant surgery needs to be improved. In this paper, we report a novel surface modification strategy, large-grit sandblasting combined with micro-arc oxidation (SL-MAO), aiming to promote peri-implant bone formation and osseointegration of titanium implants.
Materials and methods
Modified titanium samples were prepared by large-grit sandblasting and acid etching (SLA), micro-arc oxidation (MAO), and SL-MAO. The resulting topographical changes and chemical composition of the samples were examined by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), respectively, and the biocompatibility and bioactivity were analyzed by bone-marrow mesenchymal stem cells (BMMSC) adhesion tests. Modified titanium implants were also inserted into the femurs of beagle dogs, and their competence of osseointegration was appraised by quantitative histomorphometry and micro-computed-tomography (micro-CT) analyses.
Compared to SLA and MAO techniques, SL-MAO surface modification further enhanced titanium surfaces by creating a topographic morphology characterized by both micron-sized craters and sub-micron-scale pits, and resulted in superior chemical composition, which promoted cell adhesion, proliferation, and osteogenic differentiation. SL-MAO-modified titanium implants osseointegrated more efficiently than SLA or MAO controls, with significantly higher bone-area (BA) ratio and bone-implant contact (BIC) in the peri-implant region.
The SL-MAO surface modification technique optimized the surface properties of titanium implants and enhanced peri-implant bone formation and osseointegration.
We thank Prof. Guangfu Yin and colleagues from College of Materials Science and Engineering, Sichuan University, who provided technical support and contributed to this work. This work was supported by Key Research and Development Project and Applied Basic Research Programs of Science and Technology Department Foundation of Sichuan Province (Grant No. 2019YFS0358 and 2018JY0139), National Natural Science Foundation of China (81801019), Sichuan University Postdoctoral Research Fund (2018SCU12020) and West China Hospital of Stomatology Sichuan University (WCHS-201702).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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