1
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Larrañaga X, Sarasua JR, Zuza E. Role of Inorganic Fillers on the Physical Aging and Toughness Loss of PLLA/BaSO 4 Composites. ACS APPLIED POLYMER MATERIALS 2023; 5:9620-9631. [PMID: 38021210 PMCID: PMC10653123 DOI: 10.1021/acsapm.3c02112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 10/18/2023] [Accepted: 10/19/2023] [Indexed: 12/01/2023]
Abstract
The addition of inorganic fillers has been reported to increase the toughness of poly(l-lactide) (PLLA), but the effect of physical aging in such composites has been neglected. The present work discusses the effect of the still ongoing segmental relaxation in PLLA-based composites filled with BaSO4 inorganic particles in regard of the filler quantity. By means of differential scanning calorimetry, X-ray diffraction, and tensile testing of progressively aged PLLA filled with particles ranging from 0.5-10 wt %, we observed an increase in the mechanical energy required to activate the plastic flow of the primary structure in the PLLA matrix, which resulted in the embrittlement of the majority of composites upon enough aging. Results further clarify the role of debonding in the activation process of PLLA, and the behavior of the composite is described at the segmental level. Only an addition of 10% of particles has effectively preserved a ductile behavior of the samples beyond 150 aging days; therefore, we strongly remark the significance of studying the effect of physical aging in such composites.
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Affiliation(s)
- Xabier Larrañaga
- Department of Mining-Metallurgy
Engineering and Materials Science & POLYMAT, Faculty of Engineering, University
of the Basque Country (UPV/EHU), Alameda de Urquijo s/n, Bilbao 48013, Spain
| | - Jose R. Sarasua
- Department of Mining-Metallurgy
Engineering and Materials Science & POLYMAT, Faculty of Engineering, University
of the Basque Country (UPV/EHU), Alameda de Urquijo s/n, Bilbao 48013, Spain
| | - Ester Zuza
- Department of Mining-Metallurgy
Engineering and Materials Science & POLYMAT, Faculty of Engineering, University
of the Basque Country (UPV/EHU), Alameda de Urquijo s/n, Bilbao 48013, Spain
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2
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Sun Y, Chong WG. Structural engineering of electrodes for flexible energy storage devices. MATERIALS HORIZONS 2023. [PMID: 37144354 DOI: 10.1039/d3mh00045a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The emergence of multifunctional wearable electronics over the past decades has triggered the exploration of flexible energy storage devices. As an important component of flexible batteries, novel electrodes with good flexibility, mechanical stability and high energy density are required to adapt to mechanical deformation while powering devices. Electrodes with sophisticated designed structures are key to achieving novel batteries and supercapacitors with extended lifetimes under long-term deformation exposures. Many different novel structures including serpentine, auxetic and biomimetic are explored to construct electrodes thanks to their excellent mechanical deformability in three dimensions. This paper considers the various design strategies established for fabricating flexible electrodes using novel structural modifications. The current state-of-the-art developments of novel structures made of two-dimensional (2D) planar and three-dimensional (3D) cellular, interconnected architectures for flexible energy storage with different functionalities, are discussed. The key tunable geometrical parameters of structures for achieving high performance are critically assessed, and the challenges and limitations of electrodes facing their practical application are revealed, to offer new insights into future prospects of this field.
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Affiliation(s)
- Yuchu Sun
- School of Energy and Chemical Engineering, Xiamen University Malaysia, Selangor Darul Ehsan, Malaysia & College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
- Institute of New Energy & Low Carbon Technology, Sichuan University, Chengdu 610207, Sichuan, P. R. China
- Energy Resources Centre of Alternative Energy Materials & Devices, Ministry of Education, Chengdu 610065, Sichuan, P. R. China
- College of Materials Science and Engineering, Sichuan University, Chengdu 610065, P. R. China
| | - Woon Gie Chong
- School of Energy and Chemical Engineering, Xiamen University Malaysia, Selangor Darul Ehsan, Malaysia & College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
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3
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Shabab T, Bas O, Dargaville BL, Ravichandran A, Tran PA, Hutmacher DW. Microporous/Macroporous Polycaprolactone Scaffolds for Dental Applications. Pharmaceutics 2023; 15:pharmaceutics15051340. [PMID: 37242582 DOI: 10.3390/pharmaceutics15051340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 04/05/2023] [Accepted: 04/20/2023] [Indexed: 05/28/2023] Open
Abstract
This study leverages the advantages of two fabrication techniques, namely, melt-extrusion-based 3D printing and porogen leaching, to develop multiphasic scaffolds with controllable properties essential for scaffold-guided dental tissue regeneration. Polycaprolactone-salt composites are 3D-printed and salt microparticles within the scaffold struts are leached out, revealing a network of microporosity. Extensive characterization confirms that multiscale scaffolds are highly tuneable in terms of their mechanical properties, degradation kinetics, and surface morphology. It can be seen that the surface roughness of the polycaprolactone scaffolds (9.41 ± 3.01 µm) increases with porogen leaching and the use of larger porogens lead to higher roughness values, reaching 28.75 ± 7.48 µm. Multiscale scaffolds exhibit improved attachment and proliferation of 3T3 fibroblast cells as well as extracellular matrix production, compared with their single-scale counterparts (an approximate 1.5- to 2-fold increase in cellular viability and metabolic activity), suggesting that these structures could potentially lead to improved tissue regeneration due to their favourable and reproducible surface morphology. Finally, various scaffolds designed as a drug delivery device were explored by loading them with the antibiotic drug cefazolin. These studies show that by using a multiphasic scaffold design, a sustained drug release profile can be achieved. The combined results strongly support the further development of these scaffolds for dental tissue regeneration applications.
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Affiliation(s)
- Tara Shabab
- Faculty of Engineering, School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Onur Bas
- Faculty of Engineering, School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia
- Max Planck Queensland Centre, Brisbane, QLD 4000, Australia
| | - Bronwin L Dargaville
- Faculty of Engineering, School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia
- Max Planck Queensland Centre, Brisbane, QLD 4000, Australia
| | - Akhilandeshwari Ravichandran
- Faculty of Engineering, School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Phong A Tran
- Faculty of Engineering, School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Dietmar W Hutmacher
- Faculty of Engineering, School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia
- Max Planck Queensland Centre, Brisbane, QLD 4000, Australia
- Australian Research Council Training Centre for Multiscale 3D Imaging, Modelling and Manufacturing (M3D Innovation), Queensland University of Technology, Kelvin Grove, QLD 4059, Australia
- Australian Research Council Training Centre for Cell and Tissue Engineering Technologies, Queensland University of Technology, Brisbane, QLD 4059, Australia
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4
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Naghavi SA, Tamaddon M, Marghoub A, Wang K, Babamiri BB, Hazeli K, Xu W, Lu X, Sun C, Wang L, Moazen M, Wang L, Li D, Liu C. Mechanical Characterisation and Numerical Modelling of TPMS-Based Gyroid and Diamond Ti6Al4V Scaffolds for Bone Implants: An Integrated Approach for Translational Consideration. Bioengineering (Basel) 2022; 9:504. [PMID: 36290472 PMCID: PMC9598079 DOI: 10.3390/bioengineering9100504] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 09/18/2022] [Accepted: 09/20/2022] [Indexed: 07/25/2023] Open
Abstract
Additive manufacturing has been used to develop a variety of scaffold designs for clinical and industrial applications. Mechanical properties (i.e., compression, tension, bending, and torsion response) of these scaffolds are significantly important for load-bearing orthopaedic implants. In this study, we designed and additively manufactured porous metallic biomaterials based on two different types of triply periodic minimal surface structures (i.e., gyroid and diamond) that mimic the mechanical properties of bone, such as porosity, stiffness, and strength. Physical and mechanical properties, including compressive, tensile, bending, and torsional stiffness and strength of the developed scaffolds, were then characterised experimentally and numerically using finite element method. Sheet thickness was constant at 300 μm, and the unit cell size was varied to generate different pore sizes and porosities. Gyroid scaffolds had a pore size in the range of 600-1200 μm and a porosity in the range of 54-72%, respectively. Corresponding values for the diamond were 900-1500 μm and 56-70%. Both structure types were validated experimentally, and a wide range of mechanical properties (including stiffness and yield strength) were predicted using the finite element method. The stiffness and strength of both structures are comparable to that of cortical bone, hence reducing the risks of scaffold failure. The results demonstrate that the developed scaffolds mimic the physical and mechanical properties of cortical bone and can be suitable for bone replacement and orthopaedic implants. However, an optimal design should be chosen based on specific performance requirements.
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Affiliation(s)
- Seyed Ataollah Naghavi
- Institute of Orthopaedic & Musculoskeletal, Division of Surgery & Interventional Science, University College London, Royal National Orthopaedic Hospital, Stanmore, London HA7 4LP, UK
| | - Maryam Tamaddon
- Institute of Orthopaedic & Musculoskeletal, Division of Surgery & Interventional Science, University College London, Royal National Orthopaedic Hospital, Stanmore, London HA7 4LP, UK
| | - Arsalan Marghoub
- Department of Mechanical Engineering, University College London, London WC1E 7JE, UK
| | - Katherine Wang
- Department of Mechanical Engineering, University College London, London WC1E 7JE, UK
| | - Behzad Bahrami Babamiri
- Aerospace and Mechanical Engineering Department, The University of Arizona, Tucson, AZ 85721, USA
| | - Kavan Hazeli
- Aerospace and Mechanical Engineering Department, The University of Arizona, Tucson, AZ 85721, USA
| | - Wei Xu
- Institute of Orthopaedic & Musculoskeletal, Division of Surgery & Interventional Science, University College London, Royal National Orthopaedic Hospital, Stanmore, London HA7 4LP, UK
- National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing, Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Xin Lu
- National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing, Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Changning Sun
- Institute of Orthopaedic & Musculoskeletal, Division of Surgery & Interventional Science, University College London, Royal National Orthopaedic Hospital, Stanmore, London HA7 4LP, UK
- State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
- National Medical Products Administration (NMPA) Key Laboratory for Research and Evaluation of Additive Manufacturing Medical Devices, Xi’an Jiaotong University, Xi’an 710054, China
| | - Liqing Wang
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Mehran Moazen
- Department of Mechanical Engineering, University College London, London WC1E 7JE, UK
| | - Ling Wang
- State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
- National Medical Products Administration (NMPA) Key Laboratory for Research and Evaluation of Additive Manufacturing Medical Devices, Xi’an Jiaotong University, Xi’an 710054, China
| | - Dichen Li
- State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
- National Medical Products Administration (NMPA) Key Laboratory for Research and Evaluation of Additive Manufacturing Medical Devices, Xi’an Jiaotong University, Xi’an 710054, China
| | - Chaozong Liu
- Institute of Orthopaedic & Musculoskeletal, Division of Surgery & Interventional Science, University College London, Royal National Orthopaedic Hospital, Stanmore, London HA7 4LP, UK
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5
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Evaluation of the osteoinductive potential of HDPSCs cultured on β-glycerol phosphate functionalized MWCNTs/PCL membranes for bone regeneration. Polym Bull (Berl) 2022. [DOI: 10.1007/s00289-021-03721-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Current Status of the Diagnosis and Management of Osteoporosis. Int J Mol Sci 2022; 23:ijms23169465. [PMID: 36012730 PMCID: PMC9408932 DOI: 10.3390/ijms23169465] [Citation(s) in RCA: 65] [Impact Index Per Article: 32.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 08/17/2022] [Accepted: 08/19/2022] [Indexed: 11/29/2022] Open
Abstract
Osteoporosis has been defined as the silent disease of the 21st century, becoming a public health risk due to its severity, chronicity and progression and affecting mainly postmenopausal women and older adults. Osteoporosis is characterized by an imbalance between bone resorption and bone production. It is diagnosed through different methods such as bone densitometry and dual X-rays. The treatment of this pathology focuses on different aspects. On the one hand, pharmacological treatments are characterized by the use of anti-resorptive drugs, as well as emerging regenerative medicine treatments such as cell therapies and the use of bioactive hydrogels. On the other hand, non-pharmacological treatments are associated with lifestyle habits that should be incorporated, such as physical activity, diet and the cessation of harmful habits such as a high consumption of alcohol or smoking. This review seeks to provide an overview of the theoretical basis in relation to bone biology, the existing methods for diagnosis and the treatments of osteoporosis, including the development of new strategies.
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7
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Mechanical Properties of Polyetheretherketone Composites with Surface-Modified Hydroxyapatite Nanofibers and Carbon Fibers. Macromol Res 2022. [DOI: 10.1007/s13233-022-0028-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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8
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Choi S, Kim JW, Lee S, Yoon WY, Han Y, Kim KJ, Rhie JW, Suh TS, Lee KD. Mechanical and Biocompatibility Properties of Sintered Titanium Powder for Mimetic 3D-Printed Bone Scaffolds. ACS OMEGA 2022; 7:10340-10346. [PMID: 35382287 PMCID: PMC8973078 DOI: 10.1021/acsomega.1c06974] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 02/25/2022] [Indexed: 06/14/2023]
Abstract
A composite comprising Ti and NaCl powders was sintered similar to a three-dimensional (3D)-printed patient-customized artificial bone scaffold. Additionally, a proper microstructure of the mimetic scaffold and the optimum processing parameters for its development were analyzed. The mechanical properties of the metal-based porous-structured framework used as an artificial bone scaffold were an optimum replacement for the human bone. Thus, it was confirmed that patient-customized scaffolds could be manufactured via 3D printing. The 3D-printed mimetic specimens were fabricated by a powder-sintering method using Ti for the metal parts, NaCl as the pore former, and polylactic acid as the biodegradable binder. Scanning electron microscopy (SEM) images showed that pores were formed homogeneously, while X-ray computed tomography confirmed that open pores were generated. The porosity and pore size distribution were measured using a mercury porosimeter, while the flexural strength and flexural elastic modulus were calculated using the three-point bending test. Based on these measurements, a pore-former content of 15 vol % optimized the density and flexural strength to 2.52 g cm-2 and 283 MPa, respectively, similar to those of the actual iliac bone. According to the 3D-printing production method, a selective laser-sintering process was applied for the fabrication of the mimetic specimen, and it was determined that the microstructure and properties similar to those of previous metal specimens could be achieved in the as-prepared specimen. Additionally, a decellularized extracellular matrix (dECM) was used to coat the surfaces and interiors of the specimens for evaluating their biocompatibilities. SEM image analysis indicated that the adipose-derived stem cells grew evenly inside the pores of the coated specimens, as compared with the bulky Ti specimens without the dECM coating. The doubling time at 65% was measured at 72, 75, and 83 h for specimens with pore-former contents of 5, 10, and 15 vol %, respectively. The doubling time without the pore former was 116 h. As compared with the specimens without the pore former (73 h), 15% of the dECM-coated specimens showed a doubling time of 64%, measured at 47 h.
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Affiliation(s)
- Sanghyeon Choi
- Department
of Materials Science and Engineering, Korea
University, Seoul 136-701, Republic of Korea
| | - Ji-Woong Kim
- Department
of Materials Science and Engineering, Korea
University, Seoul 136-701, Republic of Korea
| | - Seungtaek Lee
- Department
of Materials Science and Engineering, Korea
University, Seoul 136-701, Republic of Korea
| | - Woo Young Yoon
- Department
of Materials Science and Engineering, Korea
University, Seoul 136-701, Republic of Korea
| | - Yuna Han
- Department
of Biomedicine and Health Sciences, College of Medicine, The Catholic University of Korea, Seoul 03083, Republic of Korea
- Department
of Plastic and Reconstructive Surgery, Seoul St. Mary’s Hospital,
College of Medicine, The Catholic University
of Korea, Seoul 06591, Republic of Korea
| | - Ki-Joo Kim
- Department
of Plastic and Reconstructive Surgery, Seoul St. Mary’s Hospital,
College of Medicine, The Catholic University
of Korea, Seoul 06591, Republic of Korea
| | - Jong-Won Rhie
- Department
of Biomedicine and Health Sciences, College of Medicine, The Catholic University of Korea, Seoul 03083, Republic of Korea
- Department
of Plastic and Reconstructive Surgery, Seoul St. Mary’s Hospital,
College of Medicine, The Catholic University
of Korea, Seoul 06591, Republic of Korea
| | - Tae-Suk Suh
- Department
of Biomedical Engineering, College of Medicine, Catholic University of Korea, Seoul 03083, Republic
of Korea
| | - Kyung-Don Lee
- Institute
for Advanced Engineering, Yongin-si 17180, Republic of Korea
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9
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González-Sánchez M, Rivero-Antúnez P, Cano-Crespo R, Morales-Flórez V. Fabrication of Porous Alumina Structures by SPS and Carbon Sacrificial Template for Bone Regeneration. MATERIALS 2022; 15:ma15051754. [PMID: 35268984 PMCID: PMC8911001 DOI: 10.3390/ma15051754] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 02/08/2022] [Accepted: 02/15/2022] [Indexed: 02/06/2023]
Abstract
In this work, a procedure for fabricating porous alumina with the use of a carbon sacrificial template has been tested in order to optimize the fabrication of porous structures mimicking the porosity and mechanical properties of the human cortical bone. Two different sources of sacrificial carbon were used and compared, and different sintering and calcination routes were considered. The porosity of the alumina structures studied by Hg porosimetry revealed that the amount of porosity and the size and shape of the pores are still below the required values, although some acicular pores were clearly observed by SEM. Moreover, measured mechanical properties (Young’s modulus) remained below that of the bone, suggesting the need for further consolidation treatments. In summary, these encouraging results drive the optimization of future fabrication routes.
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Affiliation(s)
- Manuela González-Sánchez
- Departamento Física de la Materia Condensada, Universidad de Sevilla, 41012 Sevilla, Spain; (M.G.-S.); (P.R.-A.); (R.C.-C.)
| | - Pedro Rivero-Antúnez
- Departamento Física de la Materia Condensada, Universidad de Sevilla, 41012 Sevilla, Spain; (M.G.-S.); (P.R.-A.); (R.C.-C.)
- Instituto de Ciencia de Materiales de Sevilla, Centro Mixto CSIC-Universidad de Sevilla, 41092 Sevilla, Spain
| | - Rafael Cano-Crespo
- Departamento Física de la Materia Condensada, Universidad de Sevilla, 41012 Sevilla, Spain; (M.G.-S.); (P.R.-A.); (R.C.-C.)
| | - Víctor Morales-Flórez
- Departamento Física de la Materia Condensada, Universidad de Sevilla, 41012 Sevilla, Spain; (M.G.-S.); (P.R.-A.); (R.C.-C.)
- Instituto de Ciencia de Materiales de Sevilla, Centro Mixto CSIC-Universidad de Sevilla, 41092 Sevilla, Spain
- Correspondence:
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10
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Zurita-Méndez NN, Carbajal-De la Torre G, Flores-Merino MV, Espinosa-Medina MA. Development of Bioactive Glass-Collagen-Hyaluronic Acid-Polycaprolactone Scaffolds for Tissue Engineering Applications. Front Bioeng Biotechnol 2022; 10:825903. [PMID: 35252134 PMCID: PMC8894886 DOI: 10.3389/fbioe.2022.825903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 01/17/2022] [Indexed: 11/13/2022] Open
Abstract
In this work, bioactive glass (BG) particles synthesized by a sol-gel method, hyaluronic acid (HYA) and collagen (COL) extracted from chicken eggshell membrane (ESM), and as-purchased polycaprolactone (PCL) were used to obtain a novel bioactive scaffold using the gel-pressing technique. Two composite mixtures in weight percent were obtained and identified as SCF-1 and SCF-2, and were characterized by using FTIR, XRD, and SEM techniques. Subsequently, the composite materials applied as coatings were evaluated in simulated body fluid solutions using electrochemical techniques. The results of bioactivity and biodegradability evaluations, carried out by immersing in simulated body fluid and phosphate-buffered saline solution, showed that the SCF-1 sample presented the best biocompatibility. In accordance with the potentiodynamic results, the 316L-SS and the SCF-1-coated SS showed a very similar corrosion potential (Ecorr), around −228 mV, and current density (icorr) values in close proximity, while the SCF-2-coated SS showed more positive Ecorr around −68 mV and lower icorr value in one order of magnitude. These results agree with those obtained by electrochemical impedance spectroscopy, which show a corrosion mechanism governed by activation and finite diffusion through the porous layer. In addition, results were complemented by dynamic compression testing under oscillating forces to identify the developed scaffolds’ response under external forces, where the SCF-1 scaffold presented a maximum compression. The degradation resistance, bioactivity, and mechanically obtained measurements provided interesting results for potential further studies in tissue engineering.
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Affiliation(s)
- N. N. Zurita-Méndez
- Facultad de Ingeniería Mecánica, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, México
| | - G. Carbajal-De la Torre
- Facultad de Ingeniería Mecánica, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, México
| | - M. V. Flores-Merino
- Facultad de Química, Universidad Autónoma del Estado de México, Toluca de Lerdo, México
| | - M. A. Espinosa-Medina
- Facultad de Ingeniería Mecánica, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, México
- *Correspondence: M. A. Espinosa-Medina,
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11
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García-Vilana S, Sánchez-Molina D, Llumà J, Fernández-Osete I, Veláquez-Ameijide J, Martínez-González E. A predictive model for fracture in human ribs based on in vitro acoustic emission data. Med Phys 2021; 48:5540-5548. [PMID: 34245007 DOI: 10.1002/mp.15082] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 06/17/2021] [Accepted: 06/17/2021] [Indexed: 11/08/2022] Open
Abstract
PURPOSE The aim of this paper is to propose a fracture model for human ribs based on acoustic emission (AE) data. The accumulation of microcracking until a macroscopic crack is produced can be monitored by AE. The macrocrack propagation causes the loss of the structural integrity of the rib. METHODS The AE technique was used in in vitro bending tests of human ribs. The AE data obtained were used to construct a quantitative model that allows an estimation of the failure stress from the signals detected. The model predicts the ultimate stress with an error of less than 3.5% (even at stresses 15% lower than failure stress), which makes it possible to safely anticipate the failure of the rib. RESULTS The percolation theory was used to model crack propagation. Moreover, a quantitative probability-based model for the expected number of AE signals has been constructed, incorporating some ideas of percolation theory. The model predicts that AE signals associated with micro-failures should exhibit a vertical asymptote when stress increases. The occurrence of this vertical asymptote was attested in our experimental observations. The total number of microfailures detected prior to the failure is N ≈ 100 and the ultimate stress is σ ∞ = 197 ± 62 MPa. A significant correlation (p < 0.0001) between σ ∞ and the predicted value is found, using only the first N = 30 micro-failures (correlation improves for N higher). CONCLUSIONS The measurements and the shape of the curves predicted by the model fit well. In addition, the model parameters seem to explain quantitatively and qualitatively the distribution of the AE signals as the material approaches the macroscopic fracture. Moreover, some of these parameters correlate with anthropometric variables, such as age or Body Mass Index. The proposed model could be used to predict the structural failure of ribs subjected to bending.
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12
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Jeon IS, Lee MH, Choi HH, Lee S, Chon JW, Chung DJ, Park JH, Jho JY. Mechanical Properties and Bioactivity of Polyetheretherketone/Hydroxyapatite/Carbon Fiber Composite Prepared by the Mechanofusion Process. Polymers (Basel) 2021; 13:polym13121978. [PMID: 34208634 PMCID: PMC8235454 DOI: 10.3390/polym13121978] [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: 05/10/2021] [Revised: 05/27/2021] [Accepted: 06/11/2021] [Indexed: 11/16/2022] Open
Abstract
The main obstacles in the melt-processing of hydroxyapatite (HA) and carbon fiber (CF) reinforced polyetheretherketone (PEEK) composite are the high melting temperature of PEEK, poor dispersion of HA nanofillers, and poor processability due to high filler content. In this study, we prepared PEEK/HA/CF ternary composite using two different non-melt blending methods; suspension blending (SUS) in ethanol and mechanofusion process (MF) in dry condition. We compared the mechanical properties and bioactivity of the composite in a spinal cage application in the orthopedic field. Results showed that the PEEK/HA/CF composite made by the MF method exhibited higher flexural and compressive strengths than the composite prepared by the SUS method due to the enhanced dispersibility of HA nanofiller. On the basis of in vitro cell compatibility and cell attachment tests, PEEK/HA/CF composite by mechanofusion process showed an improvement in in vitro bioactivity and osteo-compatibility.
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Affiliation(s)
- In Sung Jeon
- School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Korea; (I.S.J.); (S.L.)
| | - Moon Hyun Lee
- Department of Polymer Science & Engineering, Sungkyunkwan University Suwon, Suwon 16419, Korea; (M.H.L.); (J.W.C.)
| | - Han-Hyeong Choi
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea; (H.-H.C.); (J.H.P.)
| | - Sangwoon Lee
- School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Korea; (I.S.J.); (S.L.)
| | - Joon Woo Chon
- Department of Polymer Science & Engineering, Sungkyunkwan University Suwon, Suwon 16419, Korea; (M.H.L.); (J.W.C.)
| | - Dong June Chung
- Department of Polymer Science & Engineering, Sungkyunkwan University Suwon, Suwon 16419, Korea; (M.H.L.); (J.W.C.)
- Correspondence: (D.J.C.); (J.Y.J.)
| | - Jong Hyuk Park
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea; (H.-H.C.); (J.H.P.)
| | - Jae Young Jho
- School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Korea; (I.S.J.); (S.L.)
- Correspondence: (D.J.C.); (J.Y.J.)
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Zedda M, Babosova R. Does the osteon morphology depend on the body mass? A scaling study on macroscopic and histomorphometric differences between cow (Bos taurus) and sheep (Ovis aries). ZOOMORPHOLOGY 2021. [DOI: 10.1007/s00435-021-00516-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
AbstractThe structure and geometry of bone depend on many biological and environmental factors. These factors affect the bone tissue's microstructure differently, and their interaction has not yet been fully elucidated. Our research investigated the effect of body mass on the macro- and microstructure of the compact bone. Therefore we analyzed the humerus and femur bones from females of 11 cows and 11 sheep at the age of 4–10 years. Both species have very similar dietary and locomotion patterns, but their body size and weight are very different. Within macroscopical analyzes of bones were observed ascending order of robustness index and bone diaphysis index. In both animals, plexiform and irregular Haversian bone tissues were identified in humerus and femur. Conversely, the dense Haversian tissue present only in cow above all in the femur. The most considerable interspecific osteonal difference between sheep and cow was in the osteon density, whose average value is 37% higher in the cow. The osteons of sheep humerus are almost circular, and osteons of cow femur are more elliptical. Within both species, the femoral osteons are elliptical than those of humerus. Despite the cow weighing more than 10 times the sheep, the measurements of osteons and Haversian canals, are very similar (the values of the ratio cow/sheep for these types are comprised from 1.04 to 1.86). Our findings indicate that the body mass does not affect the size of bone microstructure, probably more sensitive to other factors as a lifestyle and locomotor ability.
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Cardona CI, Tinoco HA, Marín-Berrio MLF, García-Grisales J, Gomez JP, Roldan-Restrepo SI, Ortiz-Jimenez J. Electromechanical impedance measurements for bone health monitoring through teeth used as probes of a Piezo-device. Biomed Phys Eng Express 2020; 7. [PMID: 34037537 DOI: 10.1088/2057-1976/abc099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 10/13/2020] [Indexed: 11/11/2022]
Abstract
Bone is a dynamic biological tissue that acts as the primary rigid support of the body. Several systemic factors are responsible for pathologies that negatively affect its structural attributes. Although the bone is in continuous renewal by osteogenesis, metabolic diseases are the most common affectations that alter its natural equilibrium. Different techniques based on ionizing radiation are used for the bone diagnosis restrictively. However, if these are not used adequately, the application could present risks for human health. In this paper, it is proposed and explored a new technique to apply an early-stage diagnosis of bone variations. The technique evaluates bone structural conditions from the teeth (used as probes) by applying a structural health monitoring (SHM) methodology. An experimental procedure is described to identify the stiffness variations produced by mechanical drillings done in prepared bone samples. The identification is carried out applying the electromechanical impedance technique (EMI) through a piezo-actuated device in the frequency spectrum 5-20kHz. Three bone samples with incorporated teeth (three teeth, two teeth, and one tooth) were prepared to emulate a mandibular portion of alveolar bone-PDL (periodontal ligament)-tooth system. Piezo-device was attached to the crown of the tooth with an orthodontic bracket allowing the teeth to act as probes. The electrical resistance measurements were computed with an electrical decoupling approach that improved the detection of the drillings; it was due to the increment of the sensitivity of the signals. The results showed that the bone mass reduction is correlated with statistical indices obtained in specific frequency intervals of the electrical resistance. This work suggests the possibility of a future application addressed to a bone diagnosis in a non-invasive way.
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Affiliation(s)
- Carlos I Cardona
- Experimental and Computational Mechanics Laboratory, Universidad Autónoma de Manizales. Antigua Estación del Ferrocarril, Edificio Fundadores, P.C. 170001. Manizales, Colombia
| | - Hector A Tinoco
- Experimental and Computational Mechanics Laboratory, Universidad Autónoma de Manizales. Antigua Estación del Ferrocarril, Edificio Fundadores, P.C. 170001. Manizales, Colombia.,Institute of Physics of Materials, Sciences Academy of Czech Republic, Žižkova 22, 616 62 Brno, Czech Republic.,Central European Institute of Technology - Brno University of Technology, Technická 3058/10, 61600 Brno, Czech Republic
| | - Maribel L F Marín-Berrio
- Department of Health, Universidad Autónoma de Manizales, Antigua Estación del Ferrocarril, Edificio Sacatín P.C. 170001. Manizales, Colombia
| | - Juliana García-Grisales
- Department of Health, Universidad Autónoma de Manizales, Antigua Estación del Ferrocarril, Edificio Sacatín P.C. 170001. Manizales, Colombia
| | - Juan P Gomez
- Department of Health, Universidad Autónoma de Manizales, Antigua Estación del Ferrocarril, Edificio Sacatín P.C. 170001. Manizales, Colombia
| | | | - Juliana Ortiz-Jimenez
- Experimental and Computational Mechanics Laboratory, Universidad Autónoma de Manizales. Antigua Estación del Ferrocarril, Edificio Fundadores, P.C. 170001. Manizales, Colombia
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Montaño CJ, Campos TPR, Lemos BRS, Yoshida MI, Almeida NGS, Aguilar MTP, Lima CV. Effects of hydroxyapatite on PMMA-HAp cement for biomedical applications. Biomed Mater Eng 2020; 31:191-201. [PMID: 32568169 DOI: 10.3233/bme-206001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
OBJECTIVE The main goal of this study was to examine the influence of hydroxyapatite (HAp) macroaggreate concentrations on thermal and mechanical properties of radioactive bone cement and to study the relation of glass transition Tg with its mechanical properties. METHODS The bone cement as (1-x)PMMA-xHAp binary system was prepared in six [x] distinct concentration parameters of 0.0 up to 0.5. The HAp was synthesized using a solgel procedure following calcination by thermal treatment. The composite was prepared in cold based (non-radioactive) mixing polymethyl methacrylate (PMMA) and HAp. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and mechanical compressive strength (CS) were used to measure the thermal and mechanical properties. RESULTS The DSC and TGA thermal profiles in function to concentration parameter [x] were presented. The CS lies in a range of 3.71-7.37 MPa and the glass transition temperature Tg = 126.27 °C. There was a direct relationship between the PMMA-HAp thermoplastic properties with mechanical and thermal properties in function of HAp concentrations. CONCLUSION The specific PMMA-HAp composite, with a concentration ratio of 1:1 and HAp thermal treatment at the Tg, provides a material with a compression strength of 7.37 MPa and a suitable amount of porous similar to a trabecular bone, possible to apply in bone cement implants, regardless of whether they are radioactive or not.
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Affiliation(s)
- C J Montaño
- Departamento de Engenharia Nuclear, Universidade Federal de Minas Gerais, Campus Pampulha, Belo Horizonte, Brazil E-mails: , ,
| | - T P R Campos
- Departamento de Engenharia Nuclear, Universidade Federal de Minas Gerais, Campus Pampulha, Belo Horizonte, Brazil E-mails: , ,
| | - B R S Lemos
- Departamento de Química, Universidade Federal de Minas Gerais, Campus Pampulha, Belo Horizonte, Brazil E-mails: ,
| | - M I Yoshida
- Departamento de Química, Universidade Federal de Minas Gerais, Campus Pampulha, Belo Horizonte, Brazil E-mails: ,
| | - N G S Almeida
- Departamento de Engenharia Metalúrgica de Materiais, Universidade Federal de Minas Gerais, Campus Pampulha, Belo Horizonte, Brazil E-mail:
| | - M T P Aguilar
- Departamento de Materiais e Construção, Universidade Federal de Minas Gerais, Campus Pampulha, Belo Horizonte, Brazil E-mail:
| | - C V Lima
- Departamento de Engenharia Nuclear, Universidade Federal de Minas Gerais, Campus Pampulha, Belo Horizonte, Brazil E-mails: , ,
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Zedda M, Sathe V, Chakraborty P, Palombo MR, Farina V. A first comparison of bone histomorphometry in extant domestic horses (Equus caballus) and a Pleistocene Indian wild horse (Equus namadicus). Integr Zool 2020; 15:448-460. [PMID: 32297705 DOI: 10.1111/1749-4877.12444] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The microstructural features of the tissue of long bones subjected to different biomechanical stresses could be a helpful tool for a better understanding of locomotor behavior in extant and extinct mammals, including equids. However, few researches have attempted to describe the bone tissue of extinct horses. In our study, we analyze and compare the histomorphometric features of the bone tissue in extant modern horses, Equus caballus, and Equus namadicus, a Pleistocene Indian extinct wild horse. The number, position, and size of the osteons and Haversian canals of the bone tissue, classifiable as dense Haversian tissue, were considered for the comparison. The results obtained highlight some differences between the analyzed species, E. caballus having fewer and bigger osteons than E. namadicus. The microstructural differences may depend on the different lifestyles and environmental conditions characterizing the two species. The results obtained suggest that comparing the biomechanical properties of extinct and modern horse species may provide indirect information on their paleoenvironment.
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Affiliation(s)
- Marco Zedda
- Department of Veterinary Medicine, University of Sassari, Italy
| | - Vijay Sathe
- Department of AIHC & Archaeology, Deccan College Postgraduate and Research Institute, Pune, India
| | - Prateek Chakraborty
- Department of AIHC & Archaeology, Deccan College Postgraduate and Research Institute, Pune, India
| | - Maria Rita Palombo
- CNR-IGAG, c/o Department of Earth Sciences, Sapienza University, Roma, Italy
| | - Vittorio Farina
- Department of Veterinary Medicine, University of Sassari, Italy
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Cano JR, Crespo PV, Cruz E, Rivas-Ruiz F, Sánchez-Quevedo MC, Guerado E, Campos A. Is the bone tissue of the femoral neck demineralised in patients with hip fracture? Injury 2020; 51 Suppl 1:S4-S11. [PMID: 32143855 DOI: 10.1016/j.injury.2020.02.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Accepted: 02/08/2020] [Indexed: 02/02/2023]
Abstract
The aim of this study is to establish the falsifiability of the "osteoporotic hypothesis" for hip fracture, according to which the bone density and mineral composition of bone tissue in patients with hip fracture is poorer than when no such fracture is present, and that this circumstance is relevant to the occurrence of a fracture. The study population consisted of forty patients treated with arthroplasty. Twenty patients with femoral neck fracture and another twenty with hip osteoarthritis received the same diagnostic protocol and the same antibiotic, anaesthetic, surgical and antithrombotic prophylaxis. Levels of calcium (Ca), phosphorus (P) and vitamin D in blood, amongst other values, were determined, and five samples of bone tissue from the proximal femoral metaphysis were obtained and characterised by optical microscopy and microanalytical analysis. No statistically significant differences were observed between the two groups with respect to the trabecular number, area or thickness, or inter-trabecular distance. However, there were differences in the length of the trabeculae, which was greater in the patients with hip osteoarthritis (p = 0.002), but not when the groups were compared by gender. When compared by age, a greater inter-trabecular distance was observed in the patients aged over 75 years (p = 0.036) but there were no differences in the remaining parameters. Serum levels of Ca (p = 0.03), P (p < 0.01) and vitamin D (p < 0.01) were lower in the fracture group. In the quantitative microanalytical analysis, no significant differences were observed in bone levels of Ca or P or in the Ca/P index, nor was there any correlation between serum and levels of bone Ca or P (Ca-0.197:p = 0.314;P-0.274:p = 0.158).Multiple linear regression revealed no correlation between the diagnoses, vitamin D and bone levels of Ca or P. Despite the reduced serum levels of Ca and P in the patients with hip fracture, no correlation was observed with bone levels of Ca and P,which were similar in both groups. There were differences in the organic bone structure, in terms of length and inter-trabecular distance. For patients with osteoporosis, treatment should be aimed at increasing the synthesis of bone trabeculae to reinforce their structure. Nevertheless, no such treatment can prevent falls, and therefore no reduction in hip fractures amongst this population can be assured.
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Affiliation(s)
- J R Cano
- Department of Orthopaedic Surgery and Traumatology, Hospital Universitario Costa del Sol, University of Málaga, Marbella, Málaga, Spain.
| | - P V Crespo
- Tissue Engineering Group, Department of Histology, University of Granada, Granada, Spain
| | - E Cruz
- Department of Orthopaedic Surgery and Traumatology, Hospital Universitario Costa del Sol, University of Málaga, Marbella, Málaga, Spain
| | - F Rivas-Ruiz
- Research Support Unit, Hospital Universitario Costa del Sol, REDIDDEC, Marbella, (Spain)
| | - M C Sánchez-Quevedo
- Tissue Engineering Group, Department of Histology, University of Granada, Granada, Spain
| | - E Guerado
- Department of Orthopaedic Surgery and Traumatology, Hospital Universitario Costa del Sol, University of Málaga, Marbella, Málaga, Spain
| | - A Campos
- Tissue Engineering Group, Department of Histology, University of Granada, Granada, Spain
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D'Elía NL, Rial Silva R, Sartuqui J, Ercoli D, Ruso J, Messina P, Mestres G. Development and characterisation of bilayered periosteum-inspired composite membranes based on sodium alginate-hydroxyapatite nanoparticles. J Colloid Interface Sci 2020; 572:408-420. [PMID: 32272315 DOI: 10.1016/j.jcis.2020.03.086] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 03/10/2020] [Accepted: 03/23/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND AIM Membranes for guided bone regeneration should have a mechanical structure and a chemical composition suitable for mimicking biological structures. In this work, we pursue the development of periosteum-inspired bilayered membranes obtained by crosslinking alginate with different amounts of nanohydroxyapatite. EXPERIMENTS Alginate-nanohydroxyapatite interaction was studied by rheology and infrared spectroscopy measurements. The membranes were characterized regarding their tensile strength, degradation and surface morphology. Finally, cell cultures were performed on each side of the membranes. FINDINGS The ionic bonding between alginate polysaccharide networks and nanohydroxyapatite was proven, and had a clear effect in the strength and microstructure of the hydrogels. Distinct surface characteristics were achieved on each side of the membranes, resulting in a highly porous fibrous side and a mineral-rich side with higher roughness and lower porosity. Moreover, the effect of amount of nanohydroxyapatite was reflected in a decrease of the membranes' plasticity and an increment of degradation rate. Finally, it was proved that osteoblast-like cells proliferated and differentiated on the mineral-rich side, specially when a higher amount of nanohydroxyapatite was used, whereas fibroblasts-like cells were able to proliferate on the fibrous side. These periosteum-inspired membranes are promising biomaterials for guided tissue regeneration applications.
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Affiliation(s)
- Noelia L D'Elía
- Department of Chemistry, Universidad Nacional del Sur, INQUISUR-CONICET, B8000CPB Bahía Blanca, Argentina.
| | - Ramon Rial Silva
- Soft Matter and Molecular Biophysics Group, Department of Applied Physics, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain.
| | - Javier Sartuqui
- Department of Chemistry, Universidad Nacional del Sur, INQUISUR-CONICET, B8000CPB Bahía Blanca, Argentina.
| | - Daniel Ercoli
- Planta Piloto de Ingeniería Química - PLAPIQUI (UNS-CONICET), Camino La Carrindanga Km 7, 8000 Bahía Blanca, Argentina.
| | - Juan Ruso
- Soft Matter and Molecular Biophysics Group, Department of Applied Physics, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain.
| | - Paula Messina
- Department of Chemistry, Universidad Nacional del Sur, INQUISUR-CONICET, B8000CPB Bahía Blanca, Argentina.
| | - Gemma Mestres
- Materials Science and Engineering, Science for Life Laboratory, Box 534, 751 21 Uppsala University, Uppsala, Sweden.
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Novel PEEK Copolymer Synthesis and Biosafety - I: Cytotoxicity Evaluation for Clinical Application. Polymers (Basel) 2019; 11:polym11111803. [PMID: 31684104 PMCID: PMC6918363 DOI: 10.3390/polym11111803] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 10/26/2019] [Accepted: 11/01/2019] [Indexed: 12/29/2022] Open
Abstract
In this research, we synthesized novel polyetheretherketone (PEEK) copolymers and evaluated the biosafety and cytotoxicity of their composites for spinal cage applications in the orthopedic field. The PEEK copolymers and their composites were prepared through a solution polymerization method using diphenyl sulfone as a polymerization solvent. The composite of PEEK copolymer showed good mechanical properties similar to that of natural bone, and also showed good thermal characteristics for the processing of clinical use as spine cage. The results of an in vitro cytotoxicity test did not show any evidence of a toxic effect on the novel PEEK composite. On the basis of these cytotoxicity test results, the PEEK composite also proved its in vitro biosafety for application to an implantable spine cage.
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Sanchis-Gimeno JA, Llido S, Guede D, Martinez-Soriano F, Ramon Caeiro J, Blanco-Perez E. Cortical bone thickening in Type A posterior atlas arch defects: experimental report. Spine J 2017; 17:431-434. [PMID: 27769752 DOI: 10.1016/j.spinee.2016.10.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 10/13/2016] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT To date, no information about the cortical bone microstructural properties in atlas vertebrae with posterior arch defects has been reported. PURPOSE To test if there is an increased cortical bone thickening in atlases with Type A posterior atlas arch defects in an experimental model. STUDY DESIGN Micro-computed tomography (CT) study on cadaveric atlas vertebrae. METHODS We analyzed the cortical bone thickness, the cortical volume, and the medullary volume (SkyScan 1172 Bruker micro-CT NV, Kontich, Belgium) in cadaveric dry vertebrae with a Type A atlas arch defect and normal control vertebrae. RESULTS The micro-CT study revealed significant differences in cortical bone thickness (p=.005), cortical volume (p=.003), and medullary volume (p=.009) values between the normal and the Type A vertebrae. CONCLUSIONS Type A congenital atlas arch defects present a cortical bone thickening that may play a protective role against atlas fractures.
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Affiliation(s)
- Juan A Sanchis-Gimeno
- Department of Anatomy and Human Embryology, Faculty of Medicine, University of Valencia, Avda. Blasco Ibanez 15, Valencia E46010, Spain.
| | - Susanna Llido
- Department of Anatomy and Human Embryology, Faculty of Medicine, University of Valencia, Avda. Blasco Ibanez 15, Valencia E46010, Spain
| | - David Guede
- Trabeculae Technology Based Firm, Technological Park of Galicia, Ourense E32900, Spain
| | - Francisco Martinez-Soriano
- Department of Anatomy and Human Embryology, Faculty of Medicine, University of Valencia, Avda. Blasco Ibanez 15, Valencia E46010, Spain
| | - Jose Ramon Caeiro
- Orthopedic Surgery Service, USC University Hospital Complex, Travesia da Choupana, s/n, Santiago de Compostela E15706, Spain
| | - Esther Blanco-Perez
- Department of Radiology, University Hospital de La Ribera, Carretera Corbera km 1, Alzira, Valencia E46600, Spain
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Sharfeddin A, Volinsky AA, Mohan G, Gallant ND. Comparison of the macroscale and microscale tests for measuring elastic properties of polydimethylsiloxane. J Appl Polym Sci 2015. [DOI: 10.1002/app.42680] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Asma Sharfeddin
- Department of Biomedical Engineering; University of South Florida; Tampa Florida 33620
| | - Alex A. Volinsky
- Department of Mechanical Engineering; University of South Florida; Tampa Florida 33620
| | - Greeshma Mohan
- Department of Biomedical Engineering; University of South Florida; Tampa Florida 33620
| | - Nathan D. Gallant
- Department of Mechanical Engineering; University of South Florida; Tampa Florida 33620
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