Characteristics Of Dental Drill Bearings

What is a dental drill bearing?

Dental drill bearings are special bearings for dental handpieces. There is a key component on the dentist’s handpiece, called the high-speed dental drill assembly. It consists of a shaft, turbine, spring chuck, spring washer, back cover, shell, rolling bearing, and rubber positioning ring. , the rolling bearing used is called a dental drill bearing.

What are the bearing structures of high-speed turbine dental drill handpieces?

High-speed turbine dental drill handpiece bearing is a mechanical bearing composed of shaft, worm gear, spring chuck, spring gasket, back cover, shell, rolling bearing, rubber positioning ring and other parts. The high-speed dental drill ball bearing used in the high-speed dental drill handpiece has ultra-low vibration and ultra-low noise; it is corrosion-resistant and does not rust.

Dental drill bearing material performance characteristics

1. Bearing materials are crucial to their accuracy, performance and life. The bearing ring material of the high-speed turbine dental drill handpiece should be made of special corrosion-resistant stainless steel, the ball material should be Si3N4 ceramic ball with a small thermal expansion coefficient, and the cage material should be polyimide TORLON that is resistant to pressure, impact and high temperature.
2. Strict bearing processing technology is the key to product success. The bearing ring processing technology should be optimized according to the structural characteristics and technical requirements of high-speed dental drill bearings, and reasonable process allowances, dust-proof structures and key characteristic parameters should be determined, and the design should be suitable for CNC A solid crown-shaped cage formed by a lathe in one go.

Installation and maintenance of dental drill bearings

When installing dental drill bearings, the optimal interference between the internal control of the bearing and the shaft is 0~2μm. The circular deviation of the shaft should be less than 2μm. The force that presses the shaft into the inner hole of the bearing must act directly on the inner ring of the miniature bearing and must not act through the steel ball or ring groove to avoid damaging the bearing accuracy. After installing a pair of bearings on the turbine, clean the turbine and bearings before installing them into the machine head and then add lubricating oil (acetone or ethanol cannot be used as cleaning fluid). When installing the dental drill bearings into the handpiece, a certain axial preload (1~2N) should be applied to the pair of bearings to obtain ideal high-speed performance.

After the dental drill bearing is installed, check that the shaft cannot have axial movement and that the bearing rotates flexibly. If the axial preload is too tight or too loose, the gasket should be replaced or the gasket should be added or removed to ensure the correct preload after the bearing is installed to prevent the dental drill bearing from slipping or spinning during high-speed operation. The normal operation and service life of dental drill bearings are closely related to the maintenance of the turbine head. In the clinical use of high-speed dental drills, the turbine head must be cleaned and maintained every day. Before use, the turbine head should be removed and reinstalled after adding cleaning fluid. Keep the drill needle fixed by hand and do not rotate. Apply compressed air for a few seconds to clean and lubricate it before use.