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Sun X, Lin H, Zhang C, Huang R, Liu Y, Zhang G, Di S. Improved Osseointegration of Selective Laser Melting Titanium Implants with Unique Dual Micro/Nano-Scale Surface Topography. MATERIALS (BASEL, SWITZERLAND) 2022; 15:7811. [PMID: 36363402 PMCID: PMC9659274 DOI: 10.3390/ma15217811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 10/28/2022] [Accepted: 11/02/2022] [Indexed: 06/16/2023]
Abstract
Selective laser melting manufacture of patient specific Ti implants is serving as a promising approach for bone tissue engineering. The success of implantation is governed by effective osseointegration, which depends on the surface properties of implants. To improve the bioactivity and osteogenesis, the universal surface treatment for SLM-Ti implants is to remove the primitive roughness and then reengineer new roughness by various methods. In this study, the micro-sized partially melted Ti particles on the SLM-Ti surface were preserved for assembling mesoporous bioactive glass nanospheres to obtain a unique micro/nano- topography through combination of SLM manufacture and sol-gel processes. The results of simulated body fluid immersion test showed that bioactive ions (Ca, Si) can be continuously and stably released from the MBG nanospheres. The osseointegration properties of SLM-Ti samples, examined using pre-osteoblast cells, showed enhanced adhesion and osteogenic differentiation compared with commercial pure titanium commonly used as orthopedic implants. Overall, the developed approach of construction of the dual micro/nano topography generated on the SLM-Ti native surface could be critical to enhance musculoskeletal implant performance.
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Affiliation(s)
- Xuetong Sun
- Center for Precision Engineering, Guangzhou Institutes of Advanced Technology, Guangzhou 511458, China
| | - Huaishu Lin
- Guangdong Technical College of Water Resources and Electric Engineering, Guangzhou 510925, China
| | - Chunyu Zhang
- Guangzhou Janus Biotechnology Co., Ltd., Guangzhou 511400, China
| | - Ruiran Huang
- Center for Precision Engineering, Guangzhou Institutes of Advanced Technology, Guangzhou 511458, China
| | - Ying Liu
- Center for Precision Engineering, Guangzhou Institutes of Advanced Technology, Guangzhou 511458, China
| | - Gong Zhang
- Center for Precision Engineering, Guangzhou Institutes of Advanced Technology, Guangzhou 511458, China
| | - Si Di
- Center for Precision Engineering, Guangzhou Institutes of Advanced Technology, Guangzhou 511458, China
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Tang R, Shao C, Chen L, Yi L, Zhang B, Tang J, Ma W. A novel CKIP-1 SiRNA slow-release coating on porous titanium implants for enhanced osseointegration. BIOMATERIALS ADVANCES 2022; 137:212864. [PMID: 35929282 DOI: 10.1016/j.bioadv.2022.212864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 05/04/2022] [Accepted: 05/12/2022] [Indexed: 06/15/2023]
Abstract
Osseointegration between implants and bone tissue lays the foundation for the long-term stability of implants. The incorporation of a porous structure and local slow release of siRNA to silence casein kinase-2 interacting protein-1 (CKIP-1), a downregulator of bone formation, is expected to promote osseointegration. Here, porous implants with a porous outer layer and dense inner core were prepared by metal coinjection molding (MIM). Mg-doped calcium phosphate nanoparticles (CaPNPs)-grafted arginine-glycine-aspartate cell adhesion sequence (RGD) and transcribed activator (TAT) (MCPRT)/CKIP-1 siRNA complex and polylysine (PLL) were coated onto the surface of the porous implants by layer-by-layer (LBL) self-deposition. The in vitro results showed that the MCPRT-siRNA coating promoted MG63 cell adhesion and proliferation, enhanced the protein expressions (ALP and OC) and bone formation-related gene expression (OPN, OC and COL-1α) in vitro. The in vivo results demonstrated that the porous structure enhanced bone ingrowth and that the local slow release of MCPRT-siRNA accelerated new bone formation at the early stage. The porous structure coupled with local CKIP-1 siRNA delivery constitutes a promising approach to achieve faster and stronger osseointegration for dental implants.
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Affiliation(s)
- Ruimin Tang
- Department of Stomatology, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, PR China
| | - Chunsheng Shao
- Department of Stomatology, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, PR China
| | - Liangjian Chen
- Department of Stomatology, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, PR China.
| | - Li Yi
- Department of Stomatology, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, PR China
| | - Bo Zhang
- Department of Stomatology, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, PR China
| | - Jiangjie Tang
- Department of Stomatology, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, PR China
| | - Weina Ma
- Department of Stomatology, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, PR China
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Douman SF, De Eguilaz MR, Cumba LR, Beirne S, Wallace GG, Yue Z, Iwuoha EI, Forster RJ. Electrochemiluminescence at 3D Printed Titanium Electrodes. Front Chem 2021; 9:662810. [PMID: 34113601 PMCID: PMC8186460 DOI: 10.3389/fchem.2021.662810] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 04/06/2021] [Indexed: 11/13/2022] Open
Abstract
The fabrication and electrochemical properties of a 3D printed titanium electrode array are described. The array comprises 25 round cylinders (0.015 cm radius, 0.3 cm high) that are evenly separated on a 0.48 × 0.48 cm square porous base (total geometric area of 1.32 cm2). The electrochemically active surface area consists of fused titanium particles and exhibits a large roughness factor ≈17. In acidic, oxygenated solution, the available potential window is from ~-0.3 to +1.2 V. The voltammetric response of ferrocyanide is quasi-reversible arising from slow heterogeneous electron transfer due to the presence of a native/oxidatively formed oxide. Unlike other metal electrodes, both [Ru(bpy)3]1+ and [Ru(bpy)3]3+ can be created in aqueous solutions which enables electrochemiluminescence to be generated by an annihilation mechanism. Depositing a thin gold layer significantly increases the standard heterogeneous electron transfer rate constant, ko, by a factor of ~80 to a value of 8.0 ± 0.4 × 10−3 cm s−1 and the voltammetry of ferrocyanide becomes reversible. The titanium and gold coated arrays generate electrochemiluminescence using tri-propyl amine as a co-reactant. However, the intensity of the gold-coated array is between 30 (high scan rate) and 100-fold (slow scan rates) higher at the gold coated arrays. Moreover, while the voltammetry of the luminophore is dominated by semi-infinite linear diffusion, the ECL response is significantly influenced by radial diffusion to the individual microcylinders of the array.
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Affiliation(s)
- Samantha F Douman
- National Centre for Sensor Research, Chemistry Department, Dublin City University, Dublin, Ireland.,SensorLab (University of the Western Cape Sensor Laboratories), University of Western Cape, Cape Town, South Africa
| | - Miren Ruiz De Eguilaz
- National Centre for Sensor Research, Chemistry Department, Dublin City University, Dublin, Ireland
| | - Loanda R Cumba
- National Centre for Sensor Research, Chemistry Department, Dublin City University, Dublin, Ireland
| | - Stephen Beirne
- Australian Research Council, Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Wollongong, NSW, Australia
| | - Gordon G Wallace
- Australian Research Council, Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Wollongong, NSW, Australia
| | - Zhilian Yue
- Australian Research Council, Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Wollongong, NSW, Australia
| | - Emmanuel I Iwuoha
- SensorLab (University of the Western Cape Sensor Laboratories), University of Western Cape, Cape Town, South Africa
| | - Robert J Forster
- National Centre for Sensor Research, Chemistry Department, Dublin City University, Dublin, Ireland.,FutureNeuro SFI Research Centre, Dublin, Ireland
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Durga Prasad Reddy R, Sharma V. Additive manufacturing in drug delivery applications: A review. Int J Pharm 2020; 589:119820. [DOI: 10.1016/j.ijpharm.2020.119820] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 08/20/2020] [Accepted: 08/24/2020] [Indexed: 12/12/2022]
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Electrodeposited Biocoatings, Their Properties and Fabrication Technologies: A Review. COATINGS 2020. [DOI: 10.3390/coatings10080782] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Coatings deposited under an electric field are applied for the surface modification of biomaterials. This review is aimed to characterize the state-of-art in this area with an emphasis on the advantages and disadvantages of used methods, process determinants, and properties of coatings. Over 170 articles, published mainly during the last ten years, were chosen, and reviewed as the most representative. The most recent developments of metallic, ceramic, polymer, and composite electrodeposited coatings are described focusing on their microstructure and properties. The direct cathodic electrodeposition, pulse cathodic deposition, electrophoretic deposition, plasma electrochemical oxidation in electrolytes rich in phosphates and calcium ions, electro-spark, and electro-discharge methods are characterized. The effects of electrolyte composition, potential and current, pH, and temperature are discussed. The review demonstrates that the most popular are direct and pulse cathodic electrodeposition and electrophoretic deposition. The research is mainly aimed to introduce new coatings rather than to investigate the effects of process parameters on the properties of deposits. So far tests aim to enhance bioactivity, mechanical strength and adhesion, antibacterial efficiency, and to a lesser extent the corrosion resistance.
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Abstract
In this study, we demonstrate that a uniform coating of hydroxyapatite (HAp, Ca10(PO4)6(OH)2) can be electrochemically deposited onto metallic 3D-woven bone scaffolds to enhance their bioactivity. The HAp coatings were deposited onto metallic scaffolds using an electrolyte containing Ca(NO3)2·4H2O, NH4H2PO4, and NaNO3. The deposition potential was varied to maximize the uniformity and adhesion of the coating. Using X-ray diffraction (XRD), Raman spectroscopy, and energy-dispersive spectroscopy (EDS), we found crystallized HAp on the 3D-woven lattice under all deposition potentials, while the −1.5 V mercury sulfate reference electrode potential provided the best local uniformity with a satisfactory deposition rate. The coatings generated under this optimized condition were approximately 5 µm thick and uniform throughout the internal and external sections of the woven lattice. We seeded and cultured both coated and uncoated scaffolds with human adipose-derived stromal/stem cells (ASCs) for 12 h and 4 days. We observed that the HAp coating increased the initial cell seeding efficiency by approximately 20%. Furthermore, after 4 days of culture, ASCs cultured on HAp-coated stainless-steel scaffolds increased by 32% compared to only 17% on the uncoated scaffold. Together, these results suggest that the HAp coating improves cellular adhesion.
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