TITLE

Biodistribution of titanium dioxide from biologic compartments

AUTHOR(S)
Olmedo, Daniel G.; Tasat, Deborah R.; Guglielmotti, María Beatriz; Cabrini, Rómulo Luis
PUB. DATE
September 2008
SOURCE
Journal of Materials Science: Materials in Medicine;Sep2008, Vol. 19 Issue 9, p3049
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The layer of titanium dioxide (TiO2) of the implant is chronically exposed to the internal electrolyte milieu in the peri-implant biological compartment. Corrosion results from electrochemical attack and ensuing gradual degradation of the metallic materials and is thus of biological interest when these biomaterials are employed in clinical implantology. Herein we evaluated and compared the chronic effect and the biodistribution of TiO2 administered subcutaneously or intraperitoneally. We propose that the compartmentalization of titanium in the area of subcutaneous injection would reproduce the biological compartment of the implant and its microenvironment from which metal ions could be released and migrate systemically. Potential TiO2 deposits were identified and characterized in skin, liver and lung by histological and EDX analyses. After both treatments, the skin, liver, and lungs exhibited histological evidence of TiO2 deposits. In order to characterize in situ macrophage-like cells, tissue sections were immunohistochemically stained for CD68. Tissue specimens from all organs assayed showed positive staining for anti-macrophage monoclonal antibody CD68 (PGM1). Despite the compartmentalization of titanium within nodular areas in rats treated subcutaneously, systemic migration occurred. We concluded that systemic migration of TiO2 occurred regardless of the administration route.
ACCESSION #
32730660

 

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