operator maintenance that is performed before,
during, and after equipment usage. It is the
basic maintenance required to keep equipment
operating on a daily basis. Procedures usually
consist of maintaining fluid levels, simple
lubrication, daily inspections, cleaning, and
operator calibration checks and adjustments.
Level II (preventive maintenance)
Intermediate maintenance relates to scheduled
periodic (planned) technical inspection,
lubrications requiring disassembly,
replacement of worn or deteriorated parts,
interior cleaning, calibration verification or
adjustment, and verification of Level I
performance. Level II maintenance is to be
performed by a DET or contracted service.
Level IIIMaintenance consists of
maintenance requiring complete overhaul of the
item of equipment and is considered depot-level
maintenance or equipment manufacturer service
center level maintenance. At command
discretion, performance of Level III is permitted
if parts, personnel with technical expertise,
tools, and test equipment, and manhours are
available. Level III maintenance will usually
result in extension of service life and should be
documented in the appropriate service history.
MAINTENANCE WORK ORDERS
The Medical/Dental Maintenance Work Order
(NAVMED 6700/4) shown in figure 11-1, or
BIOFACS work orders are used to determine
workload and assign priorities for the DETs. Dental
technicians who have equipment that does not properly
function will complete the top section of the
NAVMED 6700/4. The form is then turned in to the
dental repair department for action. Depending upon
the DETs workload, they may assign you a
functioning piece of equipment on a loan basis until the
equipment repairs are completed.
DENTAL DELIVERY SYSTEM
The operation and maintenance of the dental
delivery system (DDS) which consists of a chair, unit,
and light (fig. 11-2) are critical to the performance of
You must know how to properly use,
maintain, and make minor adjustments to a dental
chair, unit, and light to avoid unnecessary delays.
Because of the many different makes and models used
in Navy dentistry, always read the manufacturers
instructions on the operation and maintenance for the
make and model of the equipment you are using.
Procedures for chemical disinfection of the DDS are
discussed in Dental Technician, Volume I, Chapter 10,
Sterilization and Disinfection.
As the dental assistant, it is your responsibility to
seat the patient and make chair adjustments smoothly,
and assure the patient is placed in the correct position
for treatment and is comfortable.
Begin each day by making a visual inspection and
an operational check of the dental chair. The dental
chair is electronically controlled and hydraulically
powered. An electronic motor drives the hydraulic
pumps enabling the back of the chair to tilt and the base
of the chair to lift. The movements are controlled by
switches located on the back of the chair. More recent
models use foot controls for infection control
Most dental chairs have movable armrests that
either slide back or raise up to provide easier patient
entry and exit. Generally, some form of a release
button locks and unlocks the armrest. A swivel/brake
device allows the dental chair to rotate to
approximately 45 degrees from either side of the center
and then lock into position.
Dental chairs are equipped with either an
articulating or a horseshoe-style headrest (fig. 11-3).
The articulating headrest allows you to move the
patients head in approximately a 60° arc. It is adjusted
by a release button located on the backside of the
headrest. The horseshoe-style headrest is adjusted by
pushing or pulling down on the headrest. The
horseshoe headrest may also have an adjustable strap
on the backside to make up and down movements of
Securing the Dental Delivery System
Procedures for securing the dental delivery system
are as follows:
Place chair in the lowest position.
Raise the back to the upright position.
Place the armrest in the locked position.
Turn off the master switch.