New Diamond Coated Carbide Dental Bur in Operation

Depositions of hot filament chemical vapor deposited (HFCVD) diamond on cobalt-cemented tungsten carbide (WC-Co) rotary cutting dental burs are presented. Conventional dental tools made of sintered polycrystalline diamond (PCD) have a number of problems associated with heterogeneity of the crystallite, decreased cutting efficiency and short life. A preferential (111) faceted diamond has been obtained after 15 hours deposition at a growth rate of 1.1 μm/hr. Diamond coated WC-Co dental burs and conventional sintered burs are mainly used in turning, milling and drilling operation for machining metal ceramic hard alloys such as cobalt-chrome, composite teeth and aluminum alloy in dental laboratory. The influence of structure, mechanical characteristics of both diamond grains and hard alloys on the wear behavior as well as the regime of grinding on diamond wear are considered. Erosion wear properties are also investigated under air-sand erosion testing method. After machining with excessive cutting performance, calculations can be made on flank and crater wears areas. Diamond coated WC-Co dental bur offered significantly better erosion and wear resistance compared to uncoated WC-Co tools and sintered burs.