Instructions for use and notes on safety
when using rotary tools
in the dental laboratory
Their daily use involves a lot of risks and hazards. The measures listed below will help to avoid
accidents, support you in your daily work and prolong the service lives of your drilling and grin-
ding tools.
Chuck damaged or dirty.
The tool slips.
Test the concentricity
by rolling on
a level surface.
Gearing damaged.
Elimination
of instruments
with imbalance.
Inspection:
Inspect all rotary instruments on a regular basis, ideally using a magnifying glass with 10x magni-
fication, and use them only if they are in perfect working order.
Typical errors when using rotary tools:
The maximum speed specified by the manufacturer must not be exceeded. The correct working
pressure prolongs the service life of rotary tools and optimises the grinding performance.
Breakout
on a sintered diamond wheel
Cause: jamming,
incorrect setting down,
negligent care.
Tool shaft bent
Cause: tool not inserted deep enough
into the collet chuck,
speed too high.
Caution: risk of injury!
Diamond wheel
broken
Cause: incorrect setting down
of the motor handpiece
on the workbench,
working without handpiece holder.
Polishing tool
broken
Cause: incorrect setting down of the
motor handpiece on the workbench,
working without handpiece holder.
Milling bit broken
Cause: motor handpiece
fell down.
Milling bit not held firmly enough
in the collet chuck
Cause: milling bit was not inserted
deep enough into the collet chuck.
Chuck cleaning
Regular cleaning of the collet chuck
with a small brush prolongs
the service life of the collet chuck
and the motor handpiece.
Chuck cleaning
Regular cleaning of the collet chuck
with a small brush helps
to prevent accidents.
Inspection and care of motor handpieces
The service lives of your motor handpieces and tools
are prolonged by the following measures:
■
Service your motor handpieces on a weekly basis.
Above all, the collet chuck must be removed and cleaned regularly.
■
Dirty collet chucks close inadequately and the tools used cannot be clamped
along their full length as is necessary (see photo).
■
When working, the tools „wander“ out of the collet chuck, can break or are flung
in an uncontrolled manner through the room.
■
Check the functionality of the collet chuck
and always close it using a tool or a protection pin.
Milling bit is not inserted deep enough into the collet chuck.
Caution: risk of injury!
Milling bit correctly clamped.
