Dmitry Royhman1, Rashmi Radhakrishnan2, Judy Chia-Chun Yuan3, Mathew T Mathew1, Louis G Mercuri4, Cortino Sukotjo5. 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; Rush University Medical Center, Department of Orthopedics (Head: Dr. Joshua Jacobs, MD), 1611 W. Harrison St., 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. 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. 4. Rush University Medical Center, Department of Orthopedics (Head: Dr. Joshua Jacobs, MD), 1611 W. Harrison St., Chicago, IL 60612, USA; TMJ Concepts, 2233 Knoll Drive, Ventura, CA 93003, USA. 5. 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. Electronic address: csukotjo@uic.edu.
Abstract
OBJECTIVE: To investigate the corrosion behaviour of commonly used TMJ implants alloys (CoCrMo and Ti6Al4V) under simulated physiological conditions. METHODS: Corrosion behaviour was evaluated using standard electrochemical corrosion techniques and galvanic corrosion techniques as per ASTM standards. Standard electrochemical tests (E(corr), I(corr), R(p) and C(f)) 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). RESULTS: The 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. CONCLUSIONS: The 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. Published by Elsevier Ltd.
OBJECTIVE: To investigate the corrosion behaviour of commonly used TMJ implants alloys (CoCrMo and Ti6Al4V) under simulated physiological conditions. METHODS: Corrosion behaviour was evaluated using standard electrochemical corrosion techniques and galvanic corrosion techniques as per ASTM standards. Standard electrochemical tests (E(corr), I(corr), R(p) and C(f)) were conducted in bovinecalf 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). RESULTS: The 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. CONCLUSIONS: The 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. Published by Elsevier Ltd.
Authors: Luciana D Trino; Erika S Bronze-Uhle; Amsaveni Ramachandran; Paulo N Lisboa-Filho; Mathew T Mathew; Anne George Journal: J Mech Behav Biomed Mater Date: 2018-02-21
Authors: Alecsandro de Moura Silva; Viviane Maria Gonçalves de Figueiredo; Renata Falchete do Prado; Gabriela de Fátima Santanta-Melo; Milagros Del Valle El Abras Ankha; Luana Marotta Reis de Vasconcellos; Argemiro Soares da Silva Sobrinho; Alexandre Luiz Souto Borges; Lafayette Nogueira Junior Journal: J Oral Biol Craniofac Res Date: 2019-04-17