TESTING OF ADHESION AND CYTOTOXICITY OF SOL-GEL COATINGS APPLIED BY DIP-COATING ON POROUS AND NON-POROUS TITANIUM

Abstract

The properties of existing biocompatible titanium implants can be improved by controlling the porosity of the substrate or surface modification, e.g., by coating. Two types of titanium substrates were used, made by pressing and the subsequent sintering of titanium powder with and without the pore-forming agent NH₄HCO₃, and they were compared with a commercial titanium metal sheet. Furthermore, the substrates were coated with a titanium sol enriched with calcium and phosphates using the dip-coating technology. The adhesion and cytotoxic properties were measured on the coatings with standard methods. The adhesion of the coatings to all types of substrates was measured with a tape test and evaluated as very good (5B). The contact and non-contact cytotoxicity tests confirmed that all the substrates with the coatings and without them were non-toxic to a mice fibroblast cell line (L929).

Keywords

• porous titanium substrate
• sol-gel
• dip-coating
• adhesion
• tape test
• cytotoxicity test