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In Vitro Molecular Study of Titanium-Niobium Alloy Biocompatibility. Biomedicines 2022; 10:biomedicines10081898. [PMID: 36009444 PMCID: PMC9405746 DOI: 10.3390/biomedicines10081898] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 07/19/2022] [Accepted: 07/28/2022] [Indexed: 11/16/2022] Open
Abstract
Titanium dental implants have common clinical applications due to their biocompatibility, biophysical and biochemical characteristics. Although current titanium is thought to be safe and beneficial for patients, there are several indications that it may release toxic metal ions or metal nanoparticles from its alloys into the surrounding environment, which could lead to clinically relevant complications including toxic reactions as well as immune dysfunctions. Hence, an adequate selection and testing of medical biomaterial with outstanding properties are warranted. This study was designed to explore the biocompatibility of smooth titanium-niobium alloy (S_TiNb) versus smooth titanium commercially pure (S_TiCp)—a reference in implantology. All experiments were performed in vitro using human osteoblast-like SaOs-2 and monocyte THP-1 cell lines as models. Cell adhesion and growth morphology were determined by scanning electron microscopy, while cell viability was evaluated using WST-1 assay. Because niobate anions or niobium nanoparticles can be released from implants during biomaterial-cell interaction, potential immunotoxicity of potassium niobate (KNbO3) salt was evaluated by examining both metabolic activity and transcriptomic profiling of treated THP-1 monocytes. The main findings of this study are that S_TiCp and S_TiNb discs do not show an impact on the proliferation and viability of SaOs-2 cells compared to polystyrene surfaces, whereas a significant decrease in THP-1 cells’ viability and metabolic activity was observed in the presence of S_TiNb discs compared to the control group. However, no significant changes were found neither at the metabolic activity nor at the transcriptomic level of THP-1 monocytes exposed to KNbO3 salt, suggesting that niobium has no effect on the immune system. Overall, these data imply a possible toxicity of S_TiNb discs toward THP-1 cells, which may not be directly related to niobium but perhaps to the manufacturing process of titanium-niobium alloy. Thus, this limitation must be overcome to make titanium alloy an excellent material for medical applications.
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Gherasim O, Grumezescu AM, Grumezescu V, Andronescu E, Negut I, Bîrcă AC, Gălățeanu B, Hudiță A. Bioactive Coatings Loaded with Osteogenic Protein for Metallic Implants. Polymers (Basel) 2021; 13:4303. [PMID: 34960852 PMCID: PMC8703935 DOI: 10.3390/polym13244303] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Revised: 12/03/2021] [Accepted: 12/06/2021] [Indexed: 12/27/2022] Open
Abstract
Osteoconductive and osteoinductive coatings represent attractive and tunable strategies towards the enhanced biomechanics and osseointegration of metallic implants, providing accurate local modulation of bone-to-implant interface. Composite materials based on polylactide (PLA) and hydroxyapatite (HAp) are proved beneficial substrates for the modulation of bone cells' development, being suitable mechanical supports for the repair and regeneration of bone tissue. Moreover, the addition of osteogenic proteins represents the next step towards the fabrication of advanced biomaterials for hard tissue engineering applications, as their regulatory mechanisms beneficially contribute to the new bone formation. In this respect, laser-processed composites, based on PLA, Hap, and bone morphogenetic protein 4(BMP4), are herein proposed as bioactive coatings for metallic implants. The nanostructured coatings proved superior ability to promote the adhesion, viability, and proliferation of osteoprogenitor cells, without affecting their normal development and further sustaining the osteogenic differentiation of the cells. Our results are complementary to previous studies regarding the successful use of chemically BMP-modified biomaterials in orthopedic and orthodontic applications.
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Affiliation(s)
- Oana Gherasim
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (O.G.); (A.M.G.); (E.A.); (A.C.B.)
- Lasers Department, National Institute for Lasers, Plasma, and Radiation Physics, RO-77125 Magurele, Romania;
| | - Alexandru Mihai Grumezescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (O.G.); (A.M.G.); (E.A.); (A.C.B.)
- Academy of Romanian Scientists, Ilfov No. 3, 50044 Bucharest, Romania
- Research Institute of the University of Bucharest—ICUB, University of Bucharest, 050657 Bucharest, Romania
| | - Valentina Grumezescu
- Lasers Department, National Institute for Lasers, Plasma, and Radiation Physics, RO-77125 Magurele, Romania;
- Academy of Romanian Scientists, Ilfov No. 3, 50044 Bucharest, Romania
| | - Ecaterina Andronescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (O.G.); (A.M.G.); (E.A.); (A.C.B.)
- Academy of Romanian Scientists, Ilfov No. 3, 50044 Bucharest, Romania
| | - Irina Negut
- Lasers Department, National Institute for Lasers, Plasma, and Radiation Physics, RO-77125 Magurele, Romania;
| | - Alexandra Cătălina Bîrcă
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (O.G.); (A.M.G.); (E.A.); (A.C.B.)
| | - Bianca Gălățeanu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91–95 Splaiul Independentei, 050095 Bucharest, Romania; (B.G.); (A.H.)
| | - Ariana Hudiță
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91–95 Splaiul Independentei, 050095 Bucharest, Romania; (B.G.); (A.H.)
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Synthesis and Characterization of a Novel Biocompatible Alloy, Ti-Nb-Zr-Ta-Sn. Int J Mol Sci 2021; 22:ijms221910611. [PMID: 34638960 PMCID: PMC8509052 DOI: 10.3390/ijms221910611] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 09/24/2021] [Accepted: 09/27/2021] [Indexed: 12/14/2022] Open
Abstract
Many current-generation biomedical implants are fabricated from the Ti-6Al-4V alloy because it has many attractive properties, such as low density and biocompatibility. However, the elastic modulus of this alloy is much larger than that of the surrounding bone, leading to bone resorption and, eventually, implant failure. In the present study, we synthesized and performed a detailed analysis of a novel low elastic modulus Ti-based alloy (Ti-28Nb-5Zr-2Ta-2Sn (TNZTS alloy)) using a variety of methods, including scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and tensile test. Additionally, the in vitro biocompatibility of the TNZTS alloy was evaluated using SCP-1, SaOs-2, and THP-1 cell lines and primary human osteoblasts. Compared to Ti-6Al-4V, the elastic modulus of TNZTS alloy was significantly lower, while measures of its in vitro biocompatibility are comparable. O2 plasma treatment of the surface of the alloy significantly increased its hydrophilicity and, hence, its in vitro biocompatibility. TNZTS alloy specimens did not induce the release of cytokines by macrophages, indicating that such scaffolds would not trigger inflammatory responses. The present results suggest that the TNZTS alloy may have potential as an alternative to Ti-6Al-4V.
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Hu N, Xie L, Liao Q, Gao A, Zheng Y, Pan H, Tong L, Yang D, Gao N, Starink MJ, Chu PK, Wang H. A more defective substrate leads to a less defective passive layer: Enhancing the mechanical strength, corrosion resistance and anti-inflammatory response of the low-modulus Ti-45Nb alloy by grain refinement. Acta Biomater 2021; 126:524-536. [PMID: 33684537 DOI: 10.1016/j.actbio.2021.02.045] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 02/24/2021] [Accepted: 02/28/2021] [Indexed: 01/04/2023]
Abstract
Orthopedic and dental implants made of β-type Ti alloys have low elastic modulus which can better relieve the stress shielding effects after surgical implantation. Nevertheless, clinical application of β-type Ti alloys is hampered by the insufficient mechanical strength and gradual release of pro-inflammatory metallic ions under physiological conditions. In this study, the β-type Ti-45Nb alloy is subjected to high-pressure torsion (HPT) processing to refine the grain size. After HPT processing, the tensile strength increases from 370 MPa to 658 MPa due to grain boundary strengthening and at the same time, the favorable elastic modulus is maintained at a low level of 61-72 GPa because the single β-phase is preserved during grain refinement. More grain boundaries decrease the work function and facilitate the formation of thicker and less defective passive films leading to better corrosion resistance. In addition, more rapid repair of the passive layer mitigates release of metallic ions from the alloy and consequently, the inflammatory response is suppressed. The results reveal a strategy to simultaneously improve the mechanical and biological properties of metallic implant materials for orthopedics and dentistry. STATEMENT OF SIGNIFICANCE: The low modulus Ti-45Nb alloy is promising in addressing the complication of stress shielding induced by biomedical Ti-based materials with too-high elastic modulus. However, its insufficient strength hampers its clinical application, and traditional strengthening via heat treatments will compromise the low elastic modulus. In the current study, we enhanced the ultimate tensile strength of Ti-45Nb from 370 MPa to 658 MPa through grain-refinement strengthening, while the elastic modulus was maintained at a low value (61-72 GPa). Moreover, substrate grain-refinement has been proved to improve the corrosion resistance of Ti-45Nb with reduced inflammatory response both in vitro and in vivo. A relationship between the substrate microstructure and the surface passive layer has been established to explain the beneficial effects of substrate grain-refinement.
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Affiliation(s)
- Nan Hu
- Center for Human Tissues and Organs Degeneration, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China; National Innovation Center for Advanced Medical Devices, Shenzhen, China
| | - Lingxia Xie
- Center for Human Tissues and Organs Degeneration, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Qing Liao
- Center for Human Tissues and Organs Degeneration, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Ang Gao
- Center for Human Tissues and Organs Degeneration, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Yanyan Zheng
- Center for Human Tissues and Organs Degeneration, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Haobo Pan
- Center for Human Tissues and Organs Degeneration, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Liping Tong
- Center for Human Tissues and Organs Degeneration, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.
| | - Dazhi Yang
- Department of Spinal Surgery, The 6th Affiliated Hospital of Shenzhen University Health Science Center, Shenzhen, China.
| | - Nong Gao
- Engineering Materials group, University of Southampton, Southampton SO17 1BJ, UK
| | - Marco J Starink
- Engineering Materials group, University of Southampton, Southampton SO17 1BJ, UK
| | - Paul K Chu
- Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Huaiyu Wang
- Center for Human Tissues and Organs Degeneration, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.
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Guo T, Oztug NAK, Han P, Ivanovski S, Gulati K. Old is Gold: Electrolyte Aging Influences the Topography, Chemistry, and Bioactivity of Anodized TiO 2 Nanopores. ACS APPLIED MATERIALS & INTERFACES 2021; 13:7897-7912. [PMID: 33570904 DOI: 10.1021/acsami.0c19569] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Titanium dioxide (TiO2) nanostructures including nanopores and nanotubes have been fabricated on titanium (Ti)-based orthopedic/dental implants via electrochemical anodization (EA) to enable local drug release and enhanced bioactivity. EA using organic electrolytes such as ethylene glycol often requires aging (repeated anodization of nontarget Ti) to fabricate stable well-ordered nanotopographies. However, limited information is available with respect to its influence on topography, chemistry, mechanical stability, and bioactivity of the fabricated structures. In the current study, titania nanopores (TNPs) using a similar voltage/time were fabricated using different ages of electrolyte (fresh/0 h to 30 h aged). Current density vs time plots of EA, changes in the electrolyte (pH, conductivity, and Ti/F ion concentration), and topographical, chemical, and mechanical characteristics of the fabricated TNPs were compared. EA using 10-20 h electrolytes resulted in stable TNPs with uniform size and improved alignment (parallel to the underlying substrate microroughness). Additionally, to evaluate bioactivity, primary human gingival fibroblasts (hGFs) were cultured onto various TNPs in vitro. The findings confirmed that the proliferation and morphology of hGFs were enhanced on 10-20 h aged electrolyte anodized TNPs. This pioneering study systematically investigates the optimization of anodization electrolyte toward fabricating nanoporous implants with desirable characteristics.
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Affiliation(s)
- Tianqi Guo
- The University of Queensland, School of Dentistry, Herston, Queensland 4006, Australia
| | - Necla Asli Kocak Oztug
- The University of Queensland, School of Dentistry, Herston, Queensland 4006, Australia
- Istanbul University, Faculty of Dentistry, Department of Periodontology, Istanbul 34116, Turkey
| | - Pingping Han
- The University of Queensland, School of Dentistry, Herston, Queensland 4006, Australia
| | - Sašo Ivanovski
- The University of Queensland, School of Dentistry, Herston, Queensland 4006, Australia
| | - Karan Gulati
- The University of Queensland, School of Dentistry, Herston, Queensland 4006, Australia
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Lee HE, Wu JH, Chao CY, Chang YH, Du JK, Chen KK, Chen HM. A Study of Low Young's Modulus Ti-15Ta-15Nb Alloy Using TEM Analysis. MATERIALS 2020; 13:ma13245694. [PMID: 33327375 PMCID: PMC7764856 DOI: 10.3390/ma13245694] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 12/06/2020] [Accepted: 12/08/2020] [Indexed: 11/16/2022]
Abstract
The microstructural characteristics and Young’s modulus of the as-cast Ti–15Ta–15Nb alloy are reported in this study. On the basis of the examined XRD and TEM results, the microstructure of the current alloy is essentially a mixture (α + β+ α′ + α″ + ω + H) phase. The new H phase has not previously been identified as a known phase in the Ti–Ta–Nb alloy system. On the basis of examination of the Kikuchi maps, the new H phase belongs to a tetragonal structural class with lattice parameters of a = b = 0.328 nm and c = 0.343 nm, denoting an optimal presentation of the atomic arrangement. The relationships of orientation between these phases would be {0001}α//{110}β//{1¯21¯0}ω//{101¯}H and (011¯0)α//(11¯2)β//(1¯010)ω//(121)H. Moreover, the Young’s modulus of the as-cast Ti–15Ta–15Nb alloy is approximately E = 80.2 ± 10.66 GPa. It is implied that the Young’s modulus can be decreased by the mixing of phases, especially with the presence of the H phase.
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Affiliation(s)
- Huey-Er Lee
- Department of Dentistry, Yuan’s General Hospital, Kaohsiung 80249, Taiwan;
| | - Ju-Hui Wu
- Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan;
- Department of Oral Hygiene, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
| | - Chih-Yeh Chao
- Department of Mechanical Engineering, National Pintung University of Science and Technology, Pingtung 91201, Taiwan; (C.-Y.C.); (H.-M.C.)
| | - Yen-Hao Chang
- School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan;
| | - Je-Kang Du
- Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan;
- School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan;
- Correspondence: (J.-K.D.); (K.-K.C.); Tel.: +886-7-3121-101 (ext. 7003) (J.-K.D.)
| | - Ker-Kong Chen
- Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan;
- School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan;
- Correspondence: (J.-K.D.); (K.-K.C.); Tel.: +886-7-3121-101 (ext. 7003) (J.-K.D.)
| | - Huey-Ming Chen
- Department of Mechanical Engineering, National Pintung University of Science and Technology, Pingtung 91201, Taiwan; (C.-Y.C.); (H.-M.C.)
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Capellato P, Camargo SEA, Sachs D. Biological Response to Nanosurface Modification on Metallic Biomaterials. Curr Osteoporos Rep 2020; 18:790-795. [PMID: 33085001 DOI: 10.1007/s11914-020-00635-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/09/2020] [Indexed: 12/20/2022]
Abstract
PURPOSE OF REVIEW New biomaterials for biomedical applications have been developed over the past few years. This work summarizes the current cell lines investigations regarding nanosurface modifications to improve biocompatibility and osseointegration. RECENT FINDINGS Material surfaces presenting biomimetic morphology that provides nanoscale architectures have been shown to alter cell/biomaterial interactions. Topographical and biofunctional surface modifications present a positive effect between material and host response. Nanoscale surfaces on titanium have the potential to provide a successful interface for implantable biomedical devices. Future studies need to directly evaluate how the titanium nanoscale materials will perform in in vivo experiments. Biocompatibility should be determined to identify titanium nanoscale as an excellent option for implant procedures.
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Affiliation(s)
- Patricia Capellato
- Institute of Physics and Chemistry, Unifei- Federal University of Itajubá, Av. BPS, 1303, Itajubá, MG, 37500 903, Brazil.
| | - Samira Esteves Afonso Camargo
- Restorative Dental Sciences, Division of Prosthodontics, University of Florida, College of Dentistry, Gainesville, FL, USA
| | - Daniela Sachs
- Institute of Physics and Chemistry, Unifei- Federal University of Itajubá, Av. BPS, 1303, Itajubá, MG, 37500 903, Brazil
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Yolun A, Şimşek M, Kaya M, Annaç EE, Köm M, Çakmak Ö. Fabrication, characterization, and in vivo biocompatibility evaluation of titanium-niobium implants. Proc Inst Mech Eng H 2020; 235:99-108. [PMID: 32988330 DOI: 10.1177/0954411920960854] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
In this study, biocompatible titanium-niobium (Ti-Nb) alloys were fabricated by using powder metallurgy methods. Physical, morphological, thermal, and mechanical analyses were performed and their in vivo compatibility was evaluated. Besides α, β, and α″ martensitic phases, α+β Widmanstätten phase due to increasing sintering temperature was seen in the microstructure of the alloys. Phase transformation temperatures of the samples decreased as Nb content increased. The ratio of Nb in the samples affected their mechanical properties. No toxic effect was observed on implanted sites. This study shows that Ti-Nb alloys can be potentially used for orthopedic applications without any toxic effects.
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Affiliation(s)
- Abdurrahman Yolun
- Department of Physics, Faculty of Science, İnönü University, Malatya, Turkey
| | - Murat Şimşek
- Department of Biomedical Engineering, Faculty of Engineering, İnönü University, Malatya, Turkey
| | - Mehmet Kaya
- Machinery and Metal Technologies Department, Çorlu Vacational School, Tekirdağ Namık Kemal University, Çorlu/Tekirdağ, Turkey
| | - Ebru Elibol Annaç
- Department of Histology, Faculty of Medicine, Adıyaman University, Adıyaman, Turkey
| | - Mustafa Köm
- Department of Surgery, Faculty of Veterinary Medicine, Fırat University, Elazığ, Turkey
| | - Ömer Çakmak
- Meterial Science and Engineering, Engineering Faculty, Gebze Technical University, Gebze, Turkey
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