Volume 87A, Issue 2 pp. 299-307

Nano hydroxyapatite structures influence early bone formation

Luiz Meirelles

Corresponding Author

Luiz Meirelles

Department of Prosthetic Dentistry/Dental Material Science, Sahlgrenska Academy at Göteborg University, Göteborg, Sweden

Department of Biomaterials, Sahlgrenska Academy at Göteborg University, Goteborg, Sweden

Department of Prosthetic Dentistry/Dental Material Science, Sahlgrenska Academy at Göteborg University, Göteborg, SwedenSearch for more papers by this author
Anna Arvidsson

Anna Arvidsson

Department of Biomaterials, Sahlgrenska Academy at Göteborg University, Goteborg, Sweden

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Martin Andersson

Martin Andersson

Department of Applied Surface Chemistry, Chalmers University of Technology, Göteborg, Sweden

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Per Kjellin

Per Kjellin

Department of Applied Surface Chemistry, Chalmers University of Technology, Göteborg, Sweden

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Tomas Albrektsson

Tomas Albrektsson

Department of Biomaterials, Sahlgrenska Academy at Göteborg University, Goteborg, Sweden

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Ann Wennerberg

Ann Wennerberg

Department of Prosthetic Dentistry/Dental Material Science, Sahlgrenska Academy at Göteborg University, Göteborg, Sweden

Department of Biomaterials, Sahlgrenska Academy at Göteborg University, Goteborg, Sweden

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First published: 07 January 2008
Citations: 161

Abstract

In a study model that aims to evaluate the effect of nanotopography on bone formation, micrometer structures known to alter bone formation, should be removed. Electropolished titanium implants were prepared to obtain a surface topography in the absence of micro structures, thereafter the implants were divided in two groups. The test group was modified with nanosize hydroxyapatite particles; the other group was left uncoated and served as control for the experiment. Topographical evaluation demonstrated increased nanoroughness parameters for the nano-HA implant and higher surface porosity compared to the control implant. The detected features had increased size and diameter equivalent to the nano-HA crystals present in the solution and the relative frequency of the feature size and diameter was very similar. Furthermore, feature density per μm2 showed a decrease of 13.5% on the nano-HA implant. Chemical characterization revealed calcium and phosphorous ions on the modified implants, whereas the control implants consisted of pure titanium oxide. Histological evaluation demonstrated significantly increased bone formation to the coated (p < 0.05) compared to uncoated implants after 4 weeks of healing. These findings indicate for the first time that early bone formation is dependent on the nanosize hydroxyapatite features, but we are unaware if we see an isolated effect of the chemistry or of the nanotopography or a combination of both. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res, 2008

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