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Author (up) Vivanco, J.; Jakes, J.E.; Slane, J.; Ploeg, H.L. pdf  doi
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  Title Accounting for structural compliance in nanoindentation measurements of bioceramic bone scaffolds Type Journal Article
  Year 2014 Publication Ceramics International Abbreviated Journal Ceram. Int.  
  Volume 40 Issue 8 Pages 12485-12492  
  Keywords Bioceramic; Bone scaffold; Nanoindentation; Musculoskeletal injuries  
  Abstract Structural properties have been shown to be critical in the osteoconductive capacity and strength of bioactive ceramic bone scaffolds. Given the cellular foam-like structure of bone scaffolds, nanoindentation has been used as a technique to assess the mechanical properties of individual components of the scaffolds. Nevertheless, nanoindents placed on scaffolds may violate the rigid support assumption of the standard Oliver-Pharr method currently used in evaluating the Meyer hardness, H, and elastic modulus, E-s, of such structures. Thus, the objective of this research was to use the structural compliance method to assess whether or not specimen-scale flexing may occur during nanoindentation of bioceramic bone scaffolds and to remove the associated artifact on the H and E-s if it did occur. Scaffolds were fabricated using tricalcium phosphate and sintered at 950 degrees C and 1150 degrees C, and nanoindents were placed in three different (center, edge, and corner) scaffold locations. Using only the standard Oliver-Pharr analysis it was found that H and E-s were significantly affected by both sintering temperature and nanoindents location (p < 0.05). However, specimen-scale flexing occurred during nanoindentation in the 1150 degrees C corner location. After removing the effects of the flexing from the measurement using the structural compliance method, it was concluded that H and E-s were affected only by the sintering temperature (p < 0.05) irrespective of the nanoindent locations. These results show that specimen-scale flexing may occur during nanoindentation of components in porous bioceramic scaffolds or in similar structure biomaterials, and that the structural compliance method must be utilized to accurately assess H and E-s of these components. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.  
  Address [Vivanco, Juan; Slane, Josh; Ploeg, Heidi-Lynn] Univ Wisconsin, Dept Mech Engn, Madison, WI 53706 USA, Email: vivanco@wisc.edu  
  Corporate Author Thesis  
  Publisher Elsevier Sci Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0272-8842 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000340328600122 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 400  
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