Annexure -II

Detailed Curriculum

Repair & Maintenance of Dental equipments including Dental

chairs
Level : L3
Title Awarded : Certificate
Eligibility : 10th pass/ITI
Duration : 300 Hrs

Detailed Curriculum:

Sl. General Contents Hrs

No.

1. Tools: Tools & aids for servicing & maintenance, Hard & soft tools 110

DC & AC Electricity :Fundamentals ,concept of voltage ,current ,power ,AC waveform ,

Rechargeable cells ,batteries

Test & Measuring instruments: Use of Multimeter, Cathode Ray Oscilloscope, Logic
Analyser, Signal generator, LCR meters.

Passive components : Resistance- Colour Coding, Calculation of resistance, fixed and

variable resistances, potential dividers, presets, potentiometers, thermostats.

Capacitors- capacitor testing, colour Codes, different types of capacitors, capacitor charges,
polarity, fixed and variable capacitors.

Inductors- Introduction, magnetic materials, self & mutual inductance, Transformers -Step Up
& Down .

Active Components: Concept of Insulators, Conductors and semiconductors, Intrinsic

&extrinsic semiconductors. PN Diode- Testing, Specifications, different types of diodes i.e.
Zener Diode, LED’s etc. Transistors, PnP and NpN, Their Testing & Specifications, Transistor
as a Switch. FET, MOSFET, testing and specifications. Thrusters & their testing.

Linear IC’s – Introduction, Operational Amplifier, The 741 OP Amp, application of op amps,
Differential Amplifier, filters, Integrators, differentiators, Notch Filters, Comparators. Timers
555 Timers, Its Use As an Multivibrator.

Digital IC’s – Introduction, TTL and CMOS ICS, Logic Gates, Flip flops, Counters, Registers,
MUX & DE MUX.

Seven Segment Displays- Common anode and common cathode type displays.
 Mechanical Components: Electromechanical Components, Electromagnetic Relays,
Mechanical Switches, Pulleys, Gears, Belt, Chains, Rotatory Switches.

Soldering and Disordering: Soldering Tools, Soldering Materials, Soldering Procedure,

Soldering Techniques, Desoldering, Soldering and Disordering station, Surface Mount
Devices, rework Of SMDS, Good and Bad Soldering Joints, Special Consideration for
handling MOS devices. Different Types of PCB’s – Single Side, Double Side, Multi Layer.

Power Supply- Half Wave, Full Wave Rectifiers & bridge type rectifiers, Filters. Voltage
Regulation, Regulator IC’s, Fixed and Variable regulators. Zener Diode as Voltage Regulator.

 Switch Mode Power Supply-Working principle of SMPS,

SMPS and linear power supply comparison, Theory of operation, Transformer design,
Efficiency and EMI, Applications of SMPS

 DC Motors-Working Principle & Working Brushed and Brushless motors ,Forward &
Reverse motion for DC motors .Control of speed/ rpm in a DC motor.

 AC Motors- Working Principle, Single phase & poly Phase motors ,Servo Motors.

Split-phase motor

 Capacitor start motor

 Resistance start motor
 Permanent-split capacitor motor

Universal motor and series wound motor, Synchronous motor.

High speed DC and AC Motors.

 Comparison of electrical motors and pneumatic controlled motors. Parts of pneumatic motors
& to study its use in medical equipments

Sl. Vocational Contents Hrs Sl. General Contents Hrs
No. No.

1. Study of Dental chair functions 65 1. Dental Chairs 70

Use of Air rotor hand piece for drilling Introduction ,Basic parts of a dental chair-
teeth The Up/down motion of chair and chair
Micro motor for drilling of bones back rest motion i.e. front and back motions
Suction apparatus for washing away waste ,The hydraulic system,
material & blood stains.
compressor system for pressure in dental How hydrolics work, Study of control
chair circuit for the motions for electric
Study of light system & its controls controlled hydrolic motors, study of
Use of up/down & forward/reverse up/down control using for hydraulic pump,
control system of dental chair study of foot switch used for up/down and
Use of ultrasonic scalars & its various front/back rest motions. Light System used
controls for patient monitoring and its control circuit
Use of circuit of scalar system for dim and bright light. Light adjusting
arm to adjust angle and direction of light.
Study of X ray controls X Ray Viewer circuit (a device to check X
Ray film).Air Rotor hand piece, its
operation, Pressure control ,Foot switch for
Study of X Ray exposure on teeth & pressure control ,Three way Syringe system
developing of X Ray film .Micro motor for drilling and shaping of
bones ,its electronic control system.
Suction system and cuspidor for patient to
drain the waste material/blood stains .The
Study of control circuit for dental X Ray dental compressor ,its pressure control
system used for dental chair .Water control
Study of RVG Unit
system.
Study of UV Chamber.
Dental X Ray
UV Chamber repair
X-Ray Machine- Basic theory of X Rays,
Study of Light Cure Unit Circuit Radiation theory, diagnostic x-ray,
terminology- time, distance, mA, mA-s,
Light Cure Unit repair central-ray, wavelength, collimator,
aluminium filtration, patient support.
Study of Apex Locator in dentistry
Installation- Layout of x-ray room, safety
features required, types of x-ray machines,
ratings, operation ,panel controls. Block/
circuit diagrams, common PCBs
,transformers, rectifier circuit, time control
circuit, filament heat control circuit, types
of x-ray tubes.

Function tests- Exposure timers,

measurement of mAs, ma output, kV
available, focal-spot of x-ray tube, Trouble
shooting, faults in x-ray tube

,The X Ray tube, its construction and

working. The control circuit for X Ray. Its
various controls i.e. exposure time control,
KV control. Specifications for dental X
Ray Unit used for Dental purposes

switches, interlocks, magnetic relay and

circuit breakers and replacement.

Precaution and safety- Main source of

danger in use of x-ray machine, ICRP
guidelines for safety includes- dose limits
for radiation workers, members of public
and occupational exposure of women.

The Radiovisiography Machine (RVG) The

theory of RVG using sensors to locate the
images in dentistry. Its uses and advantages
over traditional x Ray units.

The Ultrasonic Scalar

Ultrasonic waves & their characteristics,

Usage of ultrasonic’s in medical
equipments for cleaning of teeth plaque
Working of ultrasonic scalar unit, its
different controls and its use on patients for
removal of plaque on teeth , ,Internal circuit
of scalar system .The Ultrasonic scalar
hand piece.

UV Chamber-

Physics of UV Waves, its characteristics

and usage in dental clinics for sterilisation
of surgical instruments.

Light Cure Unit-

Basic of visible light. Blue wavelength

used for polymerisation of resin based
composites i.e. the use of dental materials
for curing of light.
Apex Locator in dentistry-
Its use to determine the length of the root
canal space.
Troubleshooting Skills, Safety & 35
Security Procedures

Soft Skills 20