If you do touch the bulb by mistake, gently clean
it with cotton soaked in ethyl alcohol.
Carefully insert the new bulb into the socket and
remove the wrapper.
Never operate the dental light with the light
shield removed. The shield is your protection
against injury if the bulb shatters.
Replace the light shield, and test the dental light
to ensure it works properly.
Notify the dental repair department to replace
the spare light bulb you used, or if the light does
not begin to function properly.
The light shield is constructed of hard plastic and is
used to protect the dental light bulb and the reflector.
Because the dental light is close to the patient
treatment area, it is frequently soiled by splatter and
aerosols. Use the following steps to clean the light
Ensure the light has cooled before cleaning the
Release the fastening devices on the dental light
to remove the light shield.
Immerse the shield in warm, soapy water, rinse
in clear water, and then wipe dry with a lint-free
When the shield is clean, replace it on the dental
light and test for proper operation.
The light reflector is constructed of glass and is
protected by the light shield. Use the following steps to
clean the inside surface of the reflector when dust or
spots reduce the efficiency of the light:
Allow the light and reflector to cool before
removing the light shield.
Use a soft, lint-free cloth to gently remove any
accumulated dust particles.
Unplug the DDS or dental light. Use a
dampened cloth with water or a diluted solution
of mild dishwashing soap for a more thorough
cleaning. Ensure the cloth is not so wet that it
drips into the electrical parts of the light.
Wipe the inside surface of the reflector in one
direction only. Ensure no residue remains on the
Never use abrasives or chlorine on the surface of
the reflector. Doing so can damage or discolor
the surface of the reflector, causing poor
Do not rub heavily or clean the reflector when it
is hot. Never soak the reflector in cleaning
After cleaning is completed, replace the light
shield and test for proper operation.
A dental handpiece is a precision-built mechanical
device designed for use with rotary instruments, such
as burs, stones, wheels, and discs, used in dental
treatment. Handpieces may be air driven, electric, or
compressed gas (for surgical handpieces). Surgical
handpieces are discussed in Dental Technician,
Volume 2, Chapter 5, Oral Surgery Assistance.
Handpieces can be classified according to the
revolutions per minute (rpm) or speed at which they
operate. One type is the low- or slow-speed, and the
other is referred to as the high-speed contra-angle.
Both the low- and high-speed handpieces use an
air system to operate several parts of the handpiece.
The main function of the air is to rotate the air turbine
or vane drive. Basically, this means the air system is
the main power source for these handpieces.
Fiber optic accessories attached to dental
handpieces allow the provider to operate handpieces
with a light source and is discussed in this section.
This type of handpiece is used in cavity
preparations to remove the bulk of enamel, dentin, and
old metal restorations. It is also used to prepare
retention grooves and bevels with a cavity preparation
and to develop the cavity outline. The high-speed
contra-angle handpieces (fig. 11-8) turn at a higher rate
of speed than the slow-speed handpieces. Its speed
ranges from 380,000 to 400,000 rpm depending on the
model. High-speed handpieces are operated by air
pressure. The term contra-angle describes the angle at