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Diamond-like carbon coatings enhance scratch resistance of bearing surfaces for use in joint arthroplasty: hard substrates outperform soft.
J Biomed Mater Res B Appl Biomater. 2009 May; 89(2):527-35.JB

Abstract

The purpose of this study was to test the hypotheses that diamond-like carbon (DLC) coatings will enhance the scratch resistance of a bearing surface in joint arthroplasty, and that a hard ceramic substrate will further enhance scratch resistance by reducing plastic deformation. We tested these hypotheses by applying a hard DLC coating to medical-grade cobalt chromium alloy (CoCr) and magnesia-stabilized zirconia (Mg-PSZ) femoral heads and performing scratch tests to determine the loads required to cause cohesive and adhesive fracture of the coating. Scratch tracks of DLC-coated and noncoated heads were then scanned by optical profilometry to determine scratch depth, width, and pile-up (raised edges), as measures of susceptibility to scratching. DLC-coated CoCr specimens exhibited cohesive coating fracture as wedge spallation at an average load of 9.74 N, whereas DLC-coated Mg-PSZ exhibited cohesive fracture as arc-tensile cracks and chipping at a significantly higher average load of 41.3 N (p < 0.0001). At adhesive coating fracture, DLC-CoCr delaminated at an average load of 35.2 N, whereas DLC-Mg-PSZ fractured by recovery spallation at a significantly higher average load of 46.8 N (p < 0.05). Both DLC-CoCr and DLC-Mg-PSZ specimens exhibited significantly shallower scratches and less pile-up than did uncoated specimens (p < 0.005 and p < 0.01, respectively). However, the harder ceramic substrate of DLC-Mg-PSZ better resisted plastic deformation, requiring significantly higher loads for cohesive and adhesive coating fracture. These findings supported both of our hypotheses.

Authors+Show Affiliations

Missouri Bone & Joint Research Foundation, St. Louis, Missouri 63131, USA. mroy@mobojo.orgNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18985791

Citation

Roy, Marcel E., et al. "Diamond-like Carbon Coatings Enhance Scratch Resistance of Bearing Surfaces for Use in Joint Arthroplasty: Hard Substrates Outperform Soft." Journal of Biomedical Materials Research. Part B, Applied Biomaterials, vol. 89, no. 2, 2009, pp. 527-35.
Roy ME, Whiteside LA, Katerberg BJ. Diamond-like carbon coatings enhance scratch resistance of bearing surfaces for use in joint arthroplasty: hard substrates outperform soft. J Biomed Mater Res Part B Appl Biomater. 2009;89(2):527-35.
Roy, M. E., Whiteside, L. A., & Katerberg, B. J. (2009). Diamond-like carbon coatings enhance scratch resistance of bearing surfaces for use in joint arthroplasty: hard substrates outperform soft. Journal of Biomedical Materials Research. Part B, Applied Biomaterials, 89(2), 527-35. https://doi.org/10.1002/jbm.b.31244
Roy ME, Whiteside LA, Katerberg BJ. Diamond-like Carbon Coatings Enhance Scratch Resistance of Bearing Surfaces for Use in Joint Arthroplasty: Hard Substrates Outperform Soft. J Biomed Mater Res Part B Appl Biomater. 2009;89(2):527-35. PubMed PMID: 18985791.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Diamond-like carbon coatings enhance scratch resistance of bearing surfaces for use in joint arthroplasty: hard substrates outperform soft. AU - Roy,Marcel E, AU - Whiteside,Leo A, AU - Katerberg,Brian J, PY - 2008/11/6/pubmed PY - 2009/7/3/medline PY - 2008/11/6/entrez SP - 527 EP - 35 JF - Journal of biomedical materials research. Part B, Applied biomaterials JO - J. Biomed. Mater. Res. Part B Appl. Biomater. VL - 89 IS - 2 N2 - The purpose of this study was to test the hypotheses that diamond-like carbon (DLC) coatings will enhance the scratch resistance of a bearing surface in joint arthroplasty, and that a hard ceramic substrate will further enhance scratch resistance by reducing plastic deformation. We tested these hypotheses by applying a hard DLC coating to medical-grade cobalt chromium alloy (CoCr) and magnesia-stabilized zirconia (Mg-PSZ) femoral heads and performing scratch tests to determine the loads required to cause cohesive and adhesive fracture of the coating. Scratch tracks of DLC-coated and noncoated heads were then scanned by optical profilometry to determine scratch depth, width, and pile-up (raised edges), as measures of susceptibility to scratching. DLC-coated CoCr specimens exhibited cohesive coating fracture as wedge spallation at an average load of 9.74 N, whereas DLC-coated Mg-PSZ exhibited cohesive fracture as arc-tensile cracks and chipping at a significantly higher average load of 41.3 N (p < 0.0001). At adhesive coating fracture, DLC-CoCr delaminated at an average load of 35.2 N, whereas DLC-Mg-PSZ fractured by recovery spallation at a significantly higher average load of 46.8 N (p < 0.05). Both DLC-CoCr and DLC-Mg-PSZ specimens exhibited significantly shallower scratches and less pile-up than did uncoated specimens (p < 0.005 and p < 0.01, respectively). However, the harder ceramic substrate of DLC-Mg-PSZ better resisted plastic deformation, requiring significantly higher loads for cohesive and adhesive coating fracture. These findings supported both of our hypotheses. SN - 1552-4981 UR - https://www.unboundmedicine.com/medline/citation/18985791/Diamond_like_carbon_coatings_enhance_scratch_resistance_of_bearing_surfaces_for_use_in_joint_arthroplasty:_hard_substrates_outperform_soft_ L2 - https://doi.org/10.1002/jbm.b.31244 DB - PRIME DP - Unbound Medicine ER -