Abstract
Competitive manufacturing implies fit for purpose and efficient manufacturing practices. Dental
implants are biomedical parts that are manufactured from either Grade 4 or 5 Titanium alloy. In
certain situations it may be beneficial for patient satisfaction purposes and for product identification
marking to change the appearance (colour and reflectance) of the implant. In the present study, a
TiO2 based coating is applied on commercially pure titanium (Grade 4) alloy substrates by the
anodizing process. The objective of this study was to engineer the aesthetic appearance of the
dental implants while monitoring its effect on aspects as regards to biocompatibility and function.
Chromaticity (colour and hue) and reflectance are investigated as a function of the anodizing
process parameters (electrolyte voltage, current and electrolyte). Grade 4 titanium was anodized
in diluted sulphuric acid electrolyte at various voltages. The reflectance of the anodized specimens
was measured with a spectrophotometer. Surface roughness, oxide film thickness and chemical
composition of the oxide phase were measured. By varying the electrolyte voltage between 5 V to
40 V different colour ranges were produced. It can be concluded that the surface colour of
anodized titanium is dependent on the oxide layer thickness and therefore the applied voltage.
Conventional surface roughness did not change and was similar to the virgin material. Elevated
voltages resulted in a more crystalline oxide layer. The aesthetic appearance of titanium implants
may be improved.