Dental burs and burs are widely used for processing dentin, composite materials, ceramics, cement, metal alloys and other materials used in dentistry. Through rotation, the abrasive grinds, polishes, grinds, cuts, prepares or levels the surface. Milling cutters and burs differ in physical characteristics and scope. Let's take a closer look at their range.
Varieties of dental abrasives
Dental cutters with diamond are used for preparation of enamel and processing of ceramics. After grinding, the surface remains rough.
Tool with tungsten carbide is appropriate for layer-by-layer cutting of metal crowns, dentin. The surface remains smooth, so finishing burs are appropriate for finishing light-cured fillings.
Carborundum abrasives are suitable for grinding ceramic and porcelain crowns. They fitfor processing plastic, dentine and precious metal crowns.
Dental cutters with corundum perfectly polish acrylic products. They are used for the restoration of amalgam and metal crowns.
Arkansas stone rotary tool of choice for polishing and grinding composite materials. It is suitable for subgingival tartar removal and surface preparation for finishing.
Silicone abrasives are appropriate for finishing polishing of enamel, ceramic, amalgam and composite surfaces, as well as precious metal crowns.
Dental burr manufacturing methods
Galvanoplasty is the application of diamond powder to a metal workpiece that is in an electrolyte solution. When an electric current passes through the electrolytic solution, a matrix is formed, onto which particles of abrasive diamond powder are attracted by the deposition of a binder metal. A new composite surface is formed. Approximately 90% of the outer layer is diamond powder. The method is used for applying one-layer, two-layer and three-layer coatings on dental burs.
Sintering is the production of a powdered metal coating with the addition of a binder and a fine-grained abrasive. The mixture is baked in a special form at a temperature of 650 ⁰С. A glass charge is used as a binder. The metal component of the cutter for dentistry is a powder of copper, tin or silver. Its concentration on the cutting surfacepart does not exceed 50%. At the end of baking, the tool is given the required shape.
Lab tool
For dental work in the laboratory, dental cutters with a monolithic abrasive are used. A strong abrasive layer is obtained by vacuum diffusion welding. The maximum permissible amount of metal powder is concentrated on the surface.
This tool has stable cutting performance and extended tool life. To improve cutting properties, helical or cruciform notches are made on the working part of the cutter. Tornado technology can be used. Grooves are formed on the tool through which air circulates, providing cooling, preventing clogging of the bur with particles of dental tissue.
