Handpice coupling - why
do we have them, how do they work.
Handpiece couplings are used to connect an
instrument, usualy a drill unit to the power source
supplied by the dental delivery unit via the handpiece
hose. The power supply can be either air or
electric, there is also usually coolant air and water
supplied. In the case of an air driven handpiece, there
is a return path for the exhaust air.
standard air delivery hose in Australia is usually a six
hole configuration consisting of (1) Supply or Drive air, (2) Coolant or
Spray Water, (3) Coolant or Spray Air and
(4) Exhaust Air. (5 & 6) are the 2
pins for power to an intraoral light
We can identify all of these function on
the KaVo Multiflex® coupling.
The advantage of having a coupling as
opposed to screwing the handpiece or instrument directly to the
hose (there are handpieces available that connect directly) is
the convenience of quickly being able to change instruments
during or between procedures.
Coupling System You have.
Here is an example of how
manufacturers produce a complete range of instruments to take
advantage of a quick disconnect coupling system, in this case
it is the Austrian based W&H and their Roto Quick®
The disadvantage of coupling
systems is that all mediums have to be sealed effectively
so as to reach the handpiece or
instrument and not escape at the coupling interface.
This is accomplished by our old friend the O-ring, so it is of
upmost importance that these are in perfect
Any O-ring defect can
cause symptoms of low drive speed, low cutting torque, air or
water leaking onto the patient from the coupling, or water
spilling out of the exhaust air catcher under the delivery
If you need to replace
any of your coupling O-rings we have a comprehensive parts
listing available, CLICK HERE
to view them. Please call us for any of your O-ring replacement
KaVo Multiflex LUX® is the registered
trademark of KaVo
W&H Roto Quick® is the registered trademark of Firma
BienAir Unifix L®, Bien Air Unifix® is the registered trademark
NSK MachLit/Phatelus®, NSK Mach®, NSK QD-J® is the registered
trademark of NSK.