Tips for a long service life of your KaVo instruments – Part 1

chucking systemThe chucking system

The first part of our series about tips for a long service life of your KaVo instruments focuses on the chucking system. For a long service life of the chucking system, intact shafts and compliance with the dimensions of the dental tools and diamond grinders are especially important. The right choice of the tools plays also an important role for prolonging the service life of your KaVo handpiece. Experience our tips and tricks about the chucking system or about the right clamping length by using dental drills.


Dental drills and drill dimensions

If you use dental drills that have not been approved by KaVo, the instrument may suffer substantial damage. This can result in defects on the chucking system or defects on the drill shaft. For a long service life of your chucking system you should comply with the dimensions of the dental tools and diamond grinders. The manufacturer information concerning the length, diameter, shaft shape and maximum speed can you read in the corresponding instructions for use. You will find them also on our website.

Non-compliance with information provided by the manufacturer voids any warranty claims against KaVo!


The right shaft clamping length

non-approved dental tools
Non-approved dental tools (shafts have grooves in the clamped area)
The dental drill shaft must be smooth along the minimal shaft clamping length. Moreover it does not have any recesses or grooves.

Information about the minimal shaft clamping length:

  • The minimal shaft clamping length of KaVo standard turbines is 11 mm.
  • The minimal shaft clamping length of KaVo miniature turbines is 9 mm.

Non-compliance with manufacturer specifications can cause various defects. It is possible that the shaft can spin freely in the chuck and destroys the chuck. Furthermore, the dental drill retention force may be too low due to a worn-out shaft and the dental drill may be released during the treatment. In addition, the ball bearings, gear wheels and the chuck can be overloaded, e. g. by the dental tools being too long.


The right choice of the tool

Straight-toothed tool
Straight-toothed tool
Dental drill manufacturers recommend to integrate the drills with different materials. They recommend a special drill made of hard metal if the crown was made of metal or soft ceramics. For a zirconium crown you should use a diamond drill.

By separating crowns it is also recommended to use cross-toothed tools instead of straight-toothed tools because straight-toothed ones will more often become hooked into the tooth. Due to the abrupt hook, the chuck system of the instrument will become more stressed and the chuck and shaft could have a higher wear.

Stop the handpiece immediately if the tool hooks into the tooth!


General instructions for use

1. Before the treatment

You should close the tensioning ring of your handpiece before the treatment starts. Never start operating a straight handpiece while the chuck is open, because the straight handpiece and the chuck will jam. Moreover you sould never press or wipe the push-button on your turbine, straight or contra-angle handpiece while the handpiece is rotating.

Push-button was worn out due to incorrect use
Push-button was worn out due to incorrect use
Possible consequences by pressing the push-button during operation of the device:

  • Excessive wear and tear on drive and rotor
  • Malfunction of the push-button
  • The chuck does not release or does do with difficulty
  • Metallic abrasion products of the lid might get into the ball bearings
  • Push-button can heat up excessively

2. During the treatment

Push-button used correctly
Push-button used correctly

You should never position the patient’s cheek close to the push-button during the treatment. The friction between the push-button and the chucking system generates heat that may cause burn injuries to the mucosal membranes.

3. After the treatment

Please never leave the dental drill in the chuck after the treatment. For a prolonging service life the chuck should bear no load during storage. In addition, storage of handpieces together with dental drills is associated with a risk of injury or infection.

In the second part of our tips for a long service life of your KaVo instruments, you will learn how to clean and reprocess your surgical handpieces.

Here you can find all tips for a longer service life of your KaVo instruments!