How to use Carbide Instruments

Carbide instruments for cutting crown and bridges

Recommendations for use and safe operation in dental practices


The service-life of carbide instruments depends on compliance with the following recommendations for use and safe operation.  The instruments must be fully inserted and gripped in the contra angle with the utmost of care. It is recommended to use the red contra-angle (1:5) with connection to micro motor.  Select the correct speed to ensure optimum performance and service-life.  Operate within the recommended speed ranges. The hints covering maximum permissible speeds must be heeded.

Before placing the tungsten carbide bur/finisher in contact with the site being prepared, check that the bur is rotating at the optimum speed and that the cooling system is functioning properly. Once the preparation has been completed, remove the rotary instrument from the site and allow it to come to a standstill. Prepare carefully and without exerting pressure. Select the pressure (maximum 0.3 – 0.5 N) to ensure that the speed is not reduced noticeably. The pressure exerted on the rotary instrument is a decisive factor for the working procedure and the successful outcome of the preparation. Under no circumstances should the burs be allowed to jam. The tilt of instrument should be avoided. To prevent harm to the tooth structure, pulp and adjacent fillings, cool by spraying with sufficient amounts of water. The removal (separation) process without using sufficient coolant – minimum: 50ml/min. and incorrect application of the coolant (diverteds pray, inadequate ejection) may adversely affect the final result.