Drill grinder

The drill - the machine for bringing into rotational motion of a milletgrass - cutting tools, designed for preparation of hard tooth tissues. There are foot, and turbine electric drill. At the foot drills with the pedal, the speed of boron is 800-1500 rpm, electric reaches 30 000 rpm In an electric drill transfer of rotation of the motor shaft to the flexible shaft and tip fixed it boron is carried out via a transfer cable.
In recent years increasingly used turbine dental unit, composed of small turbines mounted on the cylinder, tip, and the compressor, feeding compressed air into the turbine. Bor is recorded directly in the turbine and rotates with a speed up to 300 000 rpm high speed of rotation of boron provides less pain.

The drill - the device, which is driven cutting tools (drills, carborundum stone, disk, and so on), used for preparation of hard tooth tissues. Drills are foot, electric and turbine. The main parts of the foot drills, now used very rarely are the pedal, by means of which is contained in a rotation of the flywheel, and the cord that transmits the traffic on the sleeve. In the cover sleeve is a flexible roller, coupled with a tip, fixing Bor. In an electric drill (Fig. 1) engine is the electric motor. In addition to the flexible hose, here apply "hard sleeves", in which the transfer on the tip is from the motor cable sent fixed on a rigid base metal rollers. The speed of Bur electric drills reaches 30 000 rpm In a turbine drills (Fig. 2) cutting tool is driven (up to 350 000 rpm) located at the tip of the turbine, which under pressure of 2.5-3.5 ATM served jet jetogo (with compressor) of air.
Increased speed of boron is the advantage of modern Century, as it removes the main causes of pain (vibration and pressure instrument on the tooth) and increases the cutting efficiency. All high-speed modern drill equipped with a water cooling system, allows you to apply through the jet mounted on the tip, the water in Bor and prepararea the tooth surface. For the drill with high speed (over 10 000 rpm), it is advisable to use of carbide and diamond burs.
Dental drills used in the preparation of hard tooth tissues. Bor consists of a working head printed on it cutting edges and shank, which boron is recorded in the tip. The size and shape of the cutting head, the shape of the head determines the name Bora: spherical, inverted cone, fissure, cylindrical, kolesovoy. Forests made from steel or carbide-tungsten alloy. Diamond drills have diamond grain size from 100 to 125 MK, fixed in a metal head. Steel forests used for electric drills with the rotational speed up to Ob/min At a higher speed, these forests quickly tupjatsja. Carbide-tungsten forests, hardness approaching diamond, suitable for use on the drill with any speed. Diamond burs appropriate to apply in the drill with speed not less than 7000 rpm Rapid wear diamond boron contributes decentration it in tip that may occur as a result of wear and failure of a tip. Carbide-tungsten and diamond burs at the correct operating mode can be used for a very long time. Dentinal filings are removed from forests using pasty bicarbonate of soda and chalk stiff brush.
Cm. also Dental tools.