Keywords: dental cutting tools, CVD diamond, medical technology, biomedical applications, wear, titanium nitride, TiN, biomaterials, dental drilling, tool wear, interlayers, diamond deposition, surface preparation
Dental drilling in severe and demanding environments
The application of diamond coatings on dental cutting tools has been the subject of attention in order to improve cutting performance and life in orthodontic applications. In order to improve the adhesion between diamond and WC-Co substrates, it is necessary to etch cobalt from the surface and prepare it for subsequent diamond growth. Alternatively, a Titanium Nitride (TiN) interlayer can be used prior to diamond deposition. Diamond film quality and purity was characterised using micro Raman spectroscopy. The performance of diamond coated WC-Co tools, uncoated WC-Co tools and diamond embedded (sintered) tools have been compared by drilling a series of holes into various materials such as human tooth, borosilicate glass and acrylic tooth materials. Flank wear has been used to assess the wear rates of the tools when machining biomedical materials. It is shown that using an interlayer prior to diamond deposition provides the best surface preparation for producing dental tools.