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Biomechanical, Histological and Ultrastructural Analyses of Laser Micro- and Nano-structured Titanium Alloy Implants: A Study in Rabbit
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
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2010 (English)In: Journal of Biomedical Materials Research - Part A, ISSN 1549-3296, Vol. 92A, no 4, 1476-1486 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to evaluate the biomechanical properties and ultrastructure of the bone response of partly laser-modified Ti6Al4V implants compared with turned, machined implants after 8 weeks in rabbit. The surface analyses performed with interference microscopy and electron microscopy showed increased surface topography with micro- and nano-sized surface features as well as increased oxide thickness of the modified surface. The biomechanical testing demonstrated a 270% increase in torque value for the surface modified implants compared with the control implants. Histological evaluation of ground sections of specimens subjected to biomechanical testing revealed ongoing bone formation and remodeling. A histological feature exclusively observed at the laser-modified surface was the presence of fracture in the mineralized bone rather than at the interface between the bone and implant. Transmission electron microscopy (TEM) was performed on Focused Ion Beam (FIB) prepared samples of the intact bone-implant interface, demonstrating a direct contact between nanocrystalline hydroxyapatite and the oxide of the laser-modified implant surface. In conclusion, laser-modified titanium alloy implants have significantly stronger bone anchorage compared with machined implants and show no adverse tissue reactions.

Place, publisher, year, edition, pages
2010. Vol. 92A, no 4, 1476-1486 p.
Keyword [en]
titanium alloy, laser, biomechanics, focused ion beam, TEM (transmission electron microscopy), interface
National Category
Engineering and Technology
URN: urn:nbn:se:uu:diva-117596DOI: 10.1002/jbm.a.32439ISI: 000274541500027PubMedID: 19425049OAI: oai:DiVA.org:uu-117596DiVA: diva2:298084
Available from: 2010-02-21 Created: 2010-02-21 Last updated: 2016-04-18Bibliographically approved

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Engqvist, Håkan
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