An electrochemical investigation of TMJ implant metal alloys in an artificial joint fluid environment: The influence of pH variation |
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| Institution: | 1. University of Illinois at Chicago College of Dentistry, Department of Restorative Dentistry (Head: Dr. Stephen Campbell, DDS, MMSc), 801 S. Paulina Ave, Chicago, IL 60612, USA;2. Rush University Medical Center, Department of Orthopedics (Head: Dr. Joshua Jacobs, MD), 1611 W. Harrison St., Chicago, IL 60612, USA;3. TMJ Concepts, 2233 Knoll Drive, Ventura, CA 93003, USA;1. Department of Orthopaedic Surgery, Beaumont Health System, Royal Oak, Michigan;2. Department of Orthopaedic Research, Beaumont Health System, Royal Oak, Michigan;1. Department of Orthopedic Surgery, Rush University Medical Center, Institute of Biomaterials, Tribocorrosion and Nanomedicine, Chicago, IL, United States;2. University of Illinois Chicago, Department of Bioengineering, Institute of Biomaterials, Tribocorrosion and Nanomedicine, Chicago, IL, United States;3. University of Illinois Chicago, College of Dentistry, Institute of Biomaterials, Tribocorrosion and Nanomedicine, Chicago, IL, United States;1. Clinical Professor, Departments of Oral and Maxillofacial Surgery and Orthodontics, Texas A&M University Health Science Center, Baylor College of Dentistry, Dallas; Private Practice, Baylor University Medical Center, Dallas, TX;2. Visiting Professor, Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL; Clinical Consultant, TMJ Concepts, Ventura, CA;3. Professor, Department of Biomedical Sciences, Texas A&M University Health Science Center, Baylor College of Dentistry, Dallas, TX;4. Former Fellow, Department of Oral and Maxillofacial Surgery, Texas A&M University Health Science Center, Baylor College of Dentistry, Baylor University Medical Center, Dallas, TX; Clinical Assistant Professor, Department of Orthodontics, St Louis University, Center for Advanced Dental Education, St Louis, MO;6. Former Fellow, Department of Oral and Maxillofacial Surgery, Texas A&M University Health Science Center, Baylor College of Dentistry, Baylor University Medical Center, Dallas, TX; Private Practice, Louisville, KY |
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| Abstract: | ObjectiveTo investigate the corrosion behaviour of commonly used TMJ implants alloys (CoCrMo and Ti6Al4V) under simulated physiological conditions.MethodsCorrosion behaviour was evaluated using standard electrochemical corrosion techniques and galvanic corrosion techniques as per ASTM standards. Standard electrochemical tests (Ecorr, Icorr, Rp and Cf) were conducted in bovine calf serum (BCS), as a function of alloys type and different pHs. Galvanic corrosion tests were conducted in BCS at a pH of 7.6. Alloy surfaces were characterized using white-light interferometry (WLI) and scanning electron microscopy (SEM).ResultsThe potentiodynamic test results exhibited the enhanced passive layer growth and a better corrosion resistance of Ti6Al4V compared to CoCrMo. Electrochemical impedance spectroscopy measurements demonstrated the influence of protein as a function of pH on corrosion mechanisms/kinetics. Galvanic coupling was not a major contributor to corrosion. SEM and WLI images demonstrated a significantly higher in surface roughness in CoCrMo after corrosion.ConclusionsThe results of this study suggest that Ti6Al4V shows superior corrosion behaviour to CoCrMo due to its strong passive layer, simulated joint fluid components can affect the electrochemical nature of the metal/electrolyte interface as a function of pH, and the galvanic effect of coupling CoCrMo and Ti6Al4V in a single joint is weak. |
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| Keywords: | Electrochemistry TMJ Titanium Alloy CoCrMo alloy Corrosion Artificial joint fluid |
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