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Medical engineering
– Dental systems
MEDICAL ENGINEERING // DIAGNOSIS // THERAPY // IMPLANTOLOGY // DENTAL SYSTEMS // INSTRUMENTS AND TOOLS
Dental drills with a turbine drive operate in the speed range from 250 000 min-1. On account of the associated high tribological load of the moving components, the technical realization of the rotor bearing is a key issue.
With the use of ceramic materials made of doped ZrO2 and / or Si3N4, such requirements can be reliably met.
Depending on the specific type of material, the following properties should be emphasized:
- High strength
- Low weight
- Low wear
- Extraordinary dry running properties, so no additional lubrication is necessary
- High reliability in long-term use and, as a result, high cost efficiency
For mouth rinsing with hot water or hot air, in dental applications sprays are used that work according to the principle of flow heaters. The electrical heating power can amount to much more than 100 W depending on the medium and flow velocity. The central component is the tubular heating unit which, for example, consists of an electrically insulating tube with heating coil inside and metal bushing soldered at one end of the tube that enables integration into the entire system. As electric insulator, high-purity, dense-sintered Al2O3 ceramic is suitable as it brings the following technical benefits for this application:
- High mechanical strength
- Modulus of elasticity > 380 GPa
- High thermal resistance
- High thermal shock resistance
- High corrosion resistance
- Specific electric resistance > 1014 Ω*cm at room temperature
- Fabrication of firmly bonded, high-vacuum-tight ceramic-metal joints by means of brazing
- High reliability in long-term use and, as a result, high cost efficiency
