Surface properties and bio-acceptability of Ti 2O 3 surfaces

Abstract

TiO 2 has been identified as a major and probably most desired surface for high bio-acceptability. South African manufactured implant surfaces revealed that Ti 2O 3 is the predominant surface layer. Chemical surface characteristics after evaluation of Ti 2O 3 surfaces using X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES) showed surfaces to be relatively free from contamination by unwanted chemical elements. Surface layers of different Ti-core metals consisted mainly of Ti, O and C. XPS analysis of surface oxide layers on all Ti-surfaces showed mainly Ti 2O 3 and TiO in smaller quantities. When evaluating in vitro bio-acceptability, percentage attachment efficiency and proliferation (%-AEP) of human fetal fibroblasts (HFF) and human gingival fibroblast (HGF) on Ti-surfaces showed that the Ti 2O 3-surface oxide furnished a highly bio-acceptable surface. Evaluation of attached HGF on Ti-surfaces using scanning electron microscopy (SEM) showed fibroblasts attached and spread on Ti-surfaces by formation of numerous filopodia. Metal leaching as determined using inductively coupled plasma emission spectroscopy (ICP) were practically absent for all Ti 2O 3-surfaces. Absence of toxic metals (V, Pd) on surfaces prepared from Ti–6Al–4V-alloy and Ti with Pd impurity, and practical absence of metal leaching, indicated that these metals did not compete for oxidation of the surface and indicated a possible masking effect of the metal surface by the Ti 2O 3-surface oxide layer. Implants with Ti 2O 3-surfaces are widely used in South Africa and have proved to be very successful.