Surface modification for titanium implants by hydroxyapatite nanocomposite

Family, R ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. Publisher: 2012
  3. Abstract:
  4. Background: Titanium (Ti) implants are commonly coated with hydroxyapatite (HA). However, HA has some disadvantages such as brittleness, low tensile strength and fracture toughness. It is desirable to combine the excellent mechanical properties of ZrO 2 and the chemical inertness of Al 2O 3 with respect to the purpose of this project which was coating Ti implants with HA-ZrO 2-Al 2O 3 to modify the surface of these implants by adding ZrO 2 and Al 2O 3 to HA. The purpose of this study was to evaluate the efficacy of hydroxyapatite coating nonocomposite. Methods: From September 2009 to January2011, functionally graded HA-Al 2O 3-ZrO 2 and HA coatings were applied on Ti samples. HA-Al 2O 3-ZrO 2 and HA sols were orderly dip coated on the substrates and calcined. Scanning electron microscopy and EDS were used to estimate the particle size of the surfaces and for morphological analysis. The morphology of non-coated HA-coated HA-Al 2O 3-ZrO 2 (composite-coated) and doublelayer composite coated samples were compared with one other. Mechanical test (heat & quench) was also done for comparing single-phase (HA), composite and double-layer composite samples. Results: The morphology of HA-Al 2O 3-ZrO 2 coating is more homogenous than HA-coated and uncoated samples. Furthermore, single-layer coating is more homogenous than double-layer coating. EDS analysis was done on HA-coated sample and showed that the Ca/P ratio in the film was similar to the theoretical value 1.67 in HA. Conclusion: Surface modification of Ti implants can be done by coating them with singlelayer of HA-Al 2O 3-ZrO 2. Single-layer hydroxyapatite-alumina-zirconia coated sample has the most homogenous morphology on the surface
  5. Keywords:
  6. Ti implants ; Hydroxyapatite ; Hydroxyapatite alumina zarconia ; Nanocoating ; Nanocomposite ; Titanium ; Unclassified drug ; Adhesion ; Bioengineering ; Comparative study ; Controlled study ; Crystallization ; Double layer coating ; Field emission scanning electron microscopy ; Material coating ; Materials testing ; Mechanical torsion ; Roentgen spectroscopy ; Single layer coating ; Surface modification
  7. Source: Caspian Journal of Internal Medicine ; Volume 3, Issue 3 , 2012 , Pages 460-465 ; 20086164 (ISSN)
  8. URL: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3755845