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Dowgierd K, Kawlewska E, Joszko K, Kropiwnicki J, Wolanski W. Biomechanical Evaluation of Temporomandibular Joint Reconstruction Using Individual TMJ Prosthesis Combined with a Fibular Free Flap in a Pediatric Patient. Bioengineering (Basel) 2023; 10:bioengineering10050541. [PMID: 37237610 DOI: 10.3390/bioengineering10050541] [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: 03/15/2023] [Revised: 04/14/2023] [Accepted: 04/25/2023] [Indexed: 05/28/2023] Open
Abstract
The main aim of this study was to perform a complex biomechanical analysis for a custom-designed temporomandibular joint (TMJ) prosthesis in combination with a fibular free flap in a pediatric case. Numerical simulations in seven variants of loads were carried out on 3D models obtained based on CT images of a 15-year-old patient in whom it was necessary to reconstruct the temporal-mandibular joints with the use of a fibula autograft. The implant model was designed based on the patient's geometry. Experimental tests on a manufactured personalized implant were carried out on the MTS Insight testing machine. Two methods of fixing the implant to the bone were analyzed-using three or five bone screws. The greatest stress was located on the top of the head of the prosthesis. The stress on the prosthesis with the five-screw configuration was lower than in the prosthesis with the three-screw configuration. The peak load analysis shows that the samples with the five-screw configuration have a lower deviation (10.88, 0.97, and 32.80%) than the groups with the three-screw configuration (57.89 and 41.10%). However, in the group with the five-screw configuration, the fixation stiffness was relatively lower (a higher value of peak load by displacement of 171.78 and 86.46 N/mm) than in the group with the three-screw configuration (where the peak load by displacement was 52.93, 60.06, and 78.92 N/mm). Based on the experimental and numerical studies performed, it could be stated that the screw configuration is crucial for biomechanical analysis. The results obtained may be an indication for surgeons, especially during planning personalized reconstruction procedures.
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Affiliation(s)
- Krzysztof Dowgierd
- Department of Clinical Pediatrics, Head and Neck Surgery Clinic for Children and Young Adults, University of Warmia and Mazury, Żołnierska 18a Street, 10-561 Olsztyn, Poland
| | - Edyta Kawlewska
- Department of Biomechatronics, Silesian University of Technology, 44-100 Gliwice, Poland
| | - Kamil Joszko
- Department of Biomechatronics, Silesian University of Technology, 44-100 Gliwice, Poland
| | - Jacek Kropiwnicki
- Scientific Department, ChM Sp Zoo Implants & Instruments, 16-061 Lewickie, Poland
| | - Wojciech Wolanski
- Department of Biomechatronics, Silesian University of Technology, 44-100 Gliwice, Poland
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Neto MQ, Radice S, Hall DJ, Mathew MT, Mercuri LG, Pourzal R. Alloys used in different Temporomandibular joint reconstruction replacement prostheses exhibit variable microstructures and electrochemical properties. J Oral Maxillofac Surg 2021; 80:798-813. [DOI: 10.1016/j.joms.2021.12.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 12/17/2021] [Accepted: 12/24/2021] [Indexed: 01/30/2023]
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3
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Royhman D, Pourzal R, Hall D, Lundberg HJ, Wimmer MA, Jacobs J, Hallab NJ, Mathew MT. Fretting-corrosion in hip taper modular junctions: The influence of topography and pH levels - An in-vitro study. J Mech Behav Biomed Mater 2021; 118:104443. [PMID: 33752094 DOI: 10.1016/j.jmbbm.2021.104443] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 03/03/2020] [Accepted: 02/27/2021] [Indexed: 10/21/2022]
Abstract
Contemporary hip implants feature a modular design. Increased reported failure rates associated with the utilization of modular junctions have raised many clinical concerns. Typically, these modular interfaces contain circumferential machining marks (threads or microgrooves), but the effect of the machining marks on the fretting-corrosion behavior of total hip implant materials is unknown. This study reports the effects of microgrooves on the fretting-corrosion behavior of hip implant materials. The flat portions of two cylindrical, polished, CrCrMo alloy pins were loaded horizontally against one rectangular Ti alloy rod. Two surface preparation groups were used for the Ti6Al4V rod (polished and machined). The polished group was prepared using the same methods as the CoCrMo pins. The machined samples were prepared by creating parallel lines on the rod surfaces to represent microgrooves present on the stem tapers of head-neck modular junctions. Newborn calf serum (30 g/L protein content; 37 °C) at pH of levels of 7.6 and 3.0 were used to simulate the normal joint fluid and a lowered pH within a crevice, respectively. The samples were tested in a fretting corrosion apparatus under a 200N normal force and a 1Hz sinusoidal fretting motion with a displacement amplitude of 25 μm. All electrochemical measurements were performed with a potentiostat in a three-electrode configuration. The results show significant differences between machined samples and polished samples in both electrochemical and mechanical responses. In all cases, the magnitude of the drop in potential was greater in the machined group compared to the polished group. The machined group showed a lower total dissipated friction energy for the entire test compared to the polished group. Additionally, the potentiostatic test measurements revealed a higher evolved charge in the machined group compared to the polished group at both pH conditions (pH 7.6 and 3.0). The machined surfaces lowered the overall dissipated friction energy at pH 7.6 compared to pH 3.0, but also compromised electrochemical performance in the tested conditions. Therefore, the role of synergistic interaction of wear and corrosion with surface topographical changes is evident from the outcome of the study. Despite the shift towards higher electrochemical destabilization in the machined group, both polished and machined groups still exhibited a mechanically dominated degradation.
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Affiliation(s)
- Dmitry Royhman
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA; Department of Biomedical Science, UIC School of Medicine, Rockford, IL, USA
| | - Robin Pourzal
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Deborah Hall
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Hannah J Lundberg
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Markus A Wimmer
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Joshua Jacobs
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Nadim J Hallab
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Mathew T Mathew
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA; Department of Biomedical Science, UIC School of Medicine, Rockford, IL, USA.
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Elledge R, Mercuri L, Attard A, Green J, Speculand B. Review of emerging temporomandibular joint total joint replacement systems. Br J Oral Maxillofac Surg 2019; 57:722-728. [DOI: 10.1016/j.bjoms.2019.08.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Accepted: 08/14/2019] [Indexed: 10/26/2022]
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Silva ADM, Figueiredo VMGD, Prado RFD, Santanta-Melo GDF, Ankha MDVEA, de Vasconcellos LMR, da Silva Sobrinho AS, Borges ALS, Nogueira Junior L. Diamond-like carbon films over reconstructive TMJ prosthetic materials: Effects in the cytotoxicity, chemical and mechanical properties. J Oral Biol Craniofac Res 2019; 9:201-207. [PMID: 31110936 DOI: 10.1016/j.jobcr.2019.04.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 04/15/2019] [Indexed: 10/27/2022] Open
Abstract
Increasingly more young patients have been submitted to reconstruction of the Temporomandibular Joint (TMJ), so, the prostheses must to present more functional longevity. Objective To evaluate the effect of diamond-like carbon film (DLC) over titanium alloy (Ti6Al4V) and polyethylene (UHWPE) samples, their mechanical and chemical properties and cellular cytotoxicity. Methods Titanium and UHWPE specimens, with 2.5 cm in diameter and 2 mm thickness were coated through plasma enhanced chemical vapor deposition (PECVD) with DLC or DLC doped with silver (DLC-Ag). Scanning electron microscopy (SEM) morphological analysis, Energy-dispersive spectroscopy (EDS) chemical analysis, scratching test, mechanical fatigue test, surface roughness analysis, and cellular cytotoxicity were performed. Data were statistically analyzed using one-way ANOVA (p < 0.05) or two-way ANOVA and multiple comparison Tukey test. Results In the SEM analysis, morphological differences were observed on substrates after DLC deposition. The film chemically modified the substrate surfaces, according to the EDS analysis. The initial critical load failure occurred at 6.1 N for DLC and 9.7 N for the DLC-Ag film. The DLC film deposition over the polyethylene promoted a decrease in the polymer's damaged area after mechanical fatigue cycling. The cytotoxicity analysis demonstrated less biocompatibility in experimental groups, when compared to control, however, increased biocompatibility was observed, at 10 days, in all groups. Conclusion The diamond-like carbon coating enhanced the chemical and mechanical properties from substrates, however modified biological interaction course of the titanium alloy (Ti6Al4V) and polyethylene (UHWPE) samples. Parameters for film deposition remain to be improved in order to obtain best biocompatibility.
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Affiliation(s)
- Alecsandro de Moura Silva
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology of São José dos Campos, São Paulo State University (UNESP), Sao Jose dos Campos, Brazil
| | - Viviane Maria Gonçalves de Figueiredo
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology of São José dos Campos, São Paulo State University (UNESP), Sao Jose dos Campos, Brazil
| | - Renata Falchete do Prado
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology of São José dos Campos, São Paulo State University (UNESP), Sao Jose dos Campos, Brazil
| | | | | | | | | | - Alexandre Luiz Souto Borges
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology of São José dos Campos, São Paulo State University (UNESP), Sao Jose dos Campos, Brazil
| | - Lafayette Nogueira Junior
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology of São José dos Campos, São Paulo State University (UNESP), Sao Jose dos Campos, Brazil
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De Meurechy N, Mommaerts M. Alloplastic temporomandibular joint replacement systems: a systematic review of their history. Int J Oral Maxillofac Surg 2018; 47:743-754. [DOI: 10.1016/j.ijom.2018.01.014] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 11/07/2017] [Accepted: 01/22/2018] [Indexed: 12/16/2022]
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Trino LD, Bronze-Uhle ES, Ramachandran A, Lisboa-Filho PN, Mathew MT, George A. Titanium surface bio-functionalization using osteogenic peptides: Surface chemistry, biocompatibility, corrosion and tribocorrosion aspects. J Mech Behav Biomed Mater 2018; 81:26-38. [PMID: 29477893 DOI: 10.1016/j.jmbbm.2018.02.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 02/17/2018] [Accepted: 02/17/2018] [Indexed: 11/24/2022]
Abstract
Titanium (Ti) is widely used in biomedical devices due to its recognized biocompatibility. However, implant failures and subsequent clinical side effects are still recurrent. In this context, improvements can be achieved by designing biomaterials where the bulk and the surface of Ti are independently tailored. The conjugation of biomolecules onto the Ti surface can improve its bioactivity, thus accelerating the osteointegration process. Ti was modified with TiO2, two different spacers, 3-(4-aminophenyl) propionic acid (APPA) or 3-mercaptopropionic acid (MPA) and dentin matrix protein 1 (DMP1) peptides. X-ray photoelectron spectroscopy analysis revealed the presence of carbon and nitrogen for all samples, indicating a success in the functionalization process. Furthermore, DMP1 peptides showed an improved coverage area for the samples with APPA and MPA spacers. Biological tests indicated that the peptides could modulate cell affinity, proliferation, and differentiation. Enhanced results were observed in the presence of MPA. Moreover, the immobilization of DMP1 peptides through the spacers led to the formation of calcium phosphate minerals with a Ca/P ratio near to that of hydroxyapatite. Corrosion and tribocorrosion results indicated an increased resistance to corrosion and lower mass loss in the functionalized materials, showing that this new type of functional material has attractive properties for biomaterials application.
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Affiliation(s)
- Luciana D Trino
- São Paulo State University (Unesp), School of Sciences, Bauru, SP 17033-360, Brazil
| | - Erika S Bronze-Uhle
- São Paulo State University (Unesp), School of Sciences, Bauru, SP 17033-360, Brazil
| | - Amsaveni Ramachandran
- Department of Oral Biology, College of Dentistry, University of Illinois at Chicago, Chicago, IL, 60612, USA
| | - Paulo N Lisboa-Filho
- São Paulo State University (Unesp), School of Sciences, Bauru, SP 17033-360, Brazil.
| | - Mathew T Mathew
- Department of Biomedical Sciences, College of Medicine at Rockford, University of Illinois-School of Medicine at Rockford, Rockford, IL, 61107-1897, USA
| | - Anne George
- Department of Oral Biology, College of Dentistry, University of Illinois at Chicago, Chicago, IL, 60612, USA
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8
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Royhman D, Patel M, Jacobs JJ, Wimmer MA, Hallab NJ, Mathew MT. In vitro simulation of fretting-corrosion in hip implant modular junctions: The influence of pH. Med Eng Phys 2018; 52:1-9. [DOI: 10.1016/j.medengphy.2017.10.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 10/25/2017] [Accepted: 10/29/2017] [Indexed: 11/26/2022]
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9
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Mercuri LG, Urban RM, Hall DJ, Mathew MT. Adverse Local Tissue Responses to Failed Temporomandibular Joint Implants. J Oral Maxillofac Surg 2017; 75:2076-2084. [DOI: 10.1016/j.joms.2017.03.044] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 03/24/2017] [Accepted: 03/24/2017] [Indexed: 11/30/2022]
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10
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Liu Y, Gilbert JL. The effect of simulated inflammatory conditions and Fenton chemistry on the electrochemistry of CoCrMo alloy. J Biomed Mater Res B Appl Biomater 2017; 106:209-220. [DOI: 10.1002/jbm.b.33830] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2016] [Revised: 10/10/2016] [Accepted: 12/01/2016] [Indexed: 12/13/2022]
Affiliation(s)
- Yangping Liu
- Syracuse Biomaterials Institute; Syracuse University; Syracuse New York 13244
- Department of Biomedical and Chemical Engineering; Syracuse University; Syracuse New York 13244
| | - Jeremy L. Gilbert
- Syracuse Biomaterials Institute; Syracuse University; Syracuse New York 13244
- Department of Biomedical and Chemical Engineering; Syracuse University; Syracuse New York 13244
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11
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Royhman D, Patel M, Runa MJ, Wimmer MA, Jacobs JJ, Hallab NJ, Mathew MT. Fretting-corrosion behavior in hip implant modular junctions: The influence of friction energy and pH variation. J Mech Behav Biomed Mater 2016; 62:570-587. [DOI: 10.1016/j.jmbbm.2016.05.024] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2015] [Revised: 02/24/2016] [Accepted: 05/18/2016] [Indexed: 11/30/2022]
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12
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Kerwell S, Alfaro M, Pourzal R, Lundberg HJ, Liao Y, Sukotjo C, Mercuri LG, Mathew MT. Examination of failed retrieved temporomandibular joint (TMJ) implants. Acta Biomater 2016; 32:324-335. [PMID: 26768232 DOI: 10.1016/j.actbio.2016.01.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Revised: 12/09/2015] [Accepted: 01/03/2016] [Indexed: 12/27/2022]
Abstract
In the management of end-stage temporomandibular joint disorders (TMD), surgeons must often resort to alloplastic temporomandibular joint (TMJ) total joint replacement (TJR) to increase mandibular function and form, as well as reduce pain. Understanding wear and failure mechanisms of TMJ TJR implants is important to their in vivo longevity. However, compared to orthopedic TJR devices, functional wear of failed TMJ TJR implants has not been examined. Not only do wear and corrosion influence TJR implant in vivo longevity, but so does reactivity of peri-implant tissue to these two events. The aim of this study was to examine and report on the wear of retrieved, failed metal-on-metal (MoM), metal-on-polymer (MoP), and titanium-nitride coated (TiN Coated) TMJ TJR implant components. A total cohort of 31 TMJ TJR devices were studied of which 28 were failed, retrieved TMJ TJRs, 3 were never implanted devices that served as controls. The mean time from implantation to removal was 7.24 years (range 3-15), SD 3.01. Optical microscopy, White Light Interferometry (WLI), Scanning Electron Microscopy (SEM), and Raman spectroscopy were utilized to characterize the surfaces of the devices. Data was acquired and evaluated by analyzing alloy microstructure. Substantial surface damage was observed between the articulating areas of the condylar head and the glenoid fossa components. Damage included pitting corrosion, evidence of deposited corrosion products, specific wear patterns, hard phases, surface depressions, and bi-directional scratches. Electrochemical analysis was performed on the MoM Control, retrieved, failed MoM, and TiN Coated devices. Electrochemical tests consisted of open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) tests conducted using the condylar head of the retrieved failed devices. EIS confirmed material properties as well as corrosion kinetics in vivo help to mitigate corrosion as reflected by the Raman spectroscopy results. In summary, this study demonstrated the role of wear and corrosion interactions on the early failure of TMJ TJR devices. Since the materials employed in most orthopedic TJR devices are similar to those used in TMJ TJR implants, studies such as this can provide data that will improve future embodiment paradigms for both. Further studies will include in vitro investigation of corrosion kinetics and the underlying tribocorrosion mechanism of TMJ TJR devices. STATEMENT OF SIGNIFICANCE An attempt is made in this study, to examine the retrieved TMJ implants and conduct surface and electrochemical analysis; further a translation research approach is employed to compare the observations from the total hip replacement (THR) retrievals. A total cohort of 31 TMJ TJR devices were studied of which 28 were failed, retrieved TMJ TJRs, 3 were never implanted devices that served as controls. Data was acquired and evaluated by analyzing alloy microstructure. Substantial surface damage was observed between the articulating areas of the condylar head and the glenoid fossa components. Electrochemical analysis was performed on the MoM Control, retrieved, failed MoM, and TiN Coated devices. This study demonstrated the role of wear and corrosion interactions on the early failure of TMJ TJR devices. Since the materials employed in most orthopedic TJR devices are similar to those used in TMJ TJR implants, a comparison study was conducted.
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Affiliation(s)
- S Kerwell
- Department of Bioengineering, University of Illinois at Chicago, Chicago, USA; Department of Orthopedic Surgery, Rush University Medical Center, Chicago, USA; Institute of Biomaterials, Tribocorrosion and Nanomedicine (IBTN), Chicago, IL, USA
| | - M Alfaro
- Department of Restorative Dentistry, University of Illinois at Chicago, Chicago, USA; Institute of Biomaterials, Tribocorrosion and Nanomedicine (IBTN), Chicago, IL, USA
| | - R Pourzal
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, USA
| | - H J Lundberg
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, USA
| | - Y Liao
- Department of Material Science and Engineering, Northwestern University, Evanston, IL, USA
| | - C Sukotjo
- Department of Restorative Dentistry, University of Illinois at Chicago, Chicago, USA; Institute of Biomaterials, Tribocorrosion and Nanomedicine (IBTN), Chicago, IL, USA
| | - L G Mercuri
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, USA; Institute of Biomaterials, Tribocorrosion and Nanomedicine (IBTN), Chicago, IL, USA
| | - M T Mathew
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, USA; Department of Restorative Dentistry, University of Illinois at Chicago, Chicago, USA; Institute of Biomaterials, Tribocorrosion and Nanomedicine (IBTN), Chicago, IL, USA.
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13
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Wang S, Zhang D, Hu N, Zhang J. Effect of angular displacement amplitude on the torsional fretting corrosion behavior of CoCrMo alloy in different synovial fluid. RSC Adv 2016. [DOI: 10.1039/c6ra09744h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The wear mechanism of torsional fretting in this paper was mainly the joint action of abrasive wear, corrosion wear and adhesive wear.
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Affiliation(s)
- Songquan Wang
- School of Mechatronic Engineering
- JiangSu Normal University
- Xuzhou 221116
- China
| | - Dekun Zhang
- School of Materials Science and Engineering
- China University of Mining and Technology
- Xuzhou 221116
- China
| | - Ningning Hu
- School of Mechatronic Engineering
- JiangSu Normal University
- Xuzhou 221116
- China
| | - Jialu Zhang
- School of Mechatronic Engineering
- JiangSu Normal University
- Xuzhou 221116
- China
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14
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Royhman D, Patel M, Runa MJ, Jacobs JJ, Hallab NJ, Wimmer MA, Mathew MT. Fretting-corrosion in Hip Implant Modular Junctions: New Experimental Set-up and Initial Outcome. TRIBOLOGY INTERNATIONAL 2015; 91:235-245. [PMID: 26405372 PMCID: PMC4576847 DOI: 10.1016/j.triboint.2015.04.032] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Modern hip prostheses feature a modular implant design with at least one tapered junction. This design can lead to several complications due to the introduction of additional interfaces, which are subjected to various loading conditions and micromotion. The main objective of current study is to develop a fretting corrosion apparatus, which is able characterize the mechanical and electrochemical behaviour of various existing metal alloy couples during fretting motion. This study describes the design and the main considerations during the development of a novel fretting corrosion apparatus, as well as determination of the machine compliance and the initial testing results. Machine compliance considerations and frictional interactions of the couples are discussed in detail. For the preliminary tests, metal alloy pins, made of Ti6Al4V and wrought high-carbon CoCrMo were mechanically polished to a surface roughness of less than 20nm. 2 pins (Diameter = 11mm) of either Ti6Al4V or CoCrMo were loaded onto a Ti6Al4V alloy rod at a normal force of 200N. The interface types included: Ti6Al4V-Ti6Al4V-Ti6Al4V, Ti6Al4V-Ti6Al4V-CoCrMo, and CoCrMo-Ti6Al4V-CoCrMo. The Ti6Al4V rod articulated against the metal alloy pins in a sinusoidal fretting motion with a displacement amplitude of ±50μm. Bovine calf serum (30g/L of protein content) was selected as a lubricant and tested at 2 different pH levels (pH 3.0 and 7.6). In all cases, current and friction energy were monitored during the fretting process. The results indicated distinct, material-specific current evolutions and friction energies. No significant differences were observed in electrochemical or mechanical behaviour in response to pH change. In general, Ti6Al4V-Ti6Al4V-Ti6Al4V couples displayed the earliest passivation and superior electrochemical behaviour compared to Ti6Al4V-Ti6Al4V-CoCrMo and CoCrMo-Ti6Al4V-CoCrMo under fretting conditions. In addition, fluctuations in current were observed in specific regions at all instances where Ti6Al4V was coupled with Ti6Al4V. These fluctuations were not observed in instances where Ti6Al4V was coupled with CoCrMo. These findings suggest transitions in the degradation mechanisms at the modular junction as a function of material couples/contacts. The findings may assist in improving the current hip modular junctions.
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Affiliation(s)
- D Royhman
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - M Patel
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA ; Department of Biotechnology, University of Illinois at Chicago Medical College, Rockford, IL, USA
| | - M J Runa
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA ; CMEMS - Center MicroElectroMechanical Systems, University of Minho, Azurém, Guimarães, Portugal
| | - J J Jacobs
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - N J Hallab
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - M A Wimmer
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - M T Mathew
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA
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15
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Christensen vs Biomet Microfixation alloplastic TMJ implant: Are there improvements? A numerical study. J Craniomaxillofac Surg 2015; 43:1398-403. [PMID: 26300296 DOI: 10.1016/j.jcms.2015.07.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2015] [Revised: 07/03/2015] [Accepted: 07/16/2015] [Indexed: 11/22/2022] Open
Abstract
The objective of this study was to compare the load transfer mechanism and behavior of two total temporomandibular joint (TMJ) prostheses: Biomet and Christensen TMJ models were simulated. Computed tomography (CT) images from a specific patient were used to generate two models for use in simulation of implantation for the total temporomandibular prostheses. Three finite element models were created in all. One considered the intact temporomandibular joint and two received a temporomandibular implant. In the simulation we considered the five most important muscles acting on the mandible and incisor teeth support. The Christensen model reduced strain in the opposite condyle by around 50% while increasing strain in the implanted condyle. The changes in the posterior side of the implanted condyle present an increase of five times the minimum principal strain, suggesting some bone fatigue. With the Biomet implant, the reduction in strain in the implanted condyle on the posterior side was around 100%, suggesting the possibility of some bone loss proximally near the resection plane. Based on our results, we conclude that in both models the implants influence the behavior of the mandible by improving the symmetry of the mandible and strain distribution. The Biomet implant modifies the behavior of the mandible slightly and presents some improvements over the Christensen TMJ model in strain distribution and tensions in the opposite intact disc similar to the non-implanted situation.
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