dental material

1. ROTARY INSTRUMENTS
Oranus Bakhtiar

2. • A hand piece – mechanical device that make rotary instruments to
turn and for positioning them intra orally
What is handpiece?

3. Rotational speed, measured in rpm
• Low speed
• High speed
 Dental hand pieces classified according to driving mechanism
• Gear driven hand piece
• Water driven hand piece
• Belt driven hand piece
• Air driven hand piece
How do we classify handpiece?

4. • Head
• End that holds the rotary instruments, such
as burs mandrels, polishing stones and
alike.
• Shank
• Handle portion of the hand piece
• Connecting End
• where the hand piece attaches to the
power source of the motor or unit.
Parts of dental hand piece

5. • Depending upon angulations
• Straight
• Contra angled
• Right angled

6. • Speed ranges from - 3000 and 20,000 rpm
• Low speed hand piece
• Straight
• Contra angle
• Clockwise or Anticlockwise
Low speed head piece

7. USES
 Cleaning teeth
 Occasionally caries excavation finishing
 Polishing procedures
ADVANTAGES
 Better tactile sensation
 Greater Torque
DISADVANTAGES
 Cutting is ineffective more time consuming
 Heat and vibrations are the main sources of patient discomfort
Low speed head piece

8. • Speeds ranges 150,000 - 450,000 rpm
• Friction grip
USES
 Tooth preparation
 Removing old restoration
 Finishing restoration wit multi-bladed burs
ADVANTAGES
 Removal of tooth structure is faster with less pressure, vibration
 Operator has better control to regulate the speed
 Patients are generally less apprehensive
DISADVANTAGES
• Intermittent use under refrigeration with an air/water spray rpm, to avoid tissue overheating
High speed head piece

9. • The chuck in head of head piece is designed to hold the shank
portion of the rotary Instrument using
• Wrench bar remover
• Latch type system
• Push button
Attachment of rotary Instrument in
hand piece

10. • Unlock the fixation clamp
• The bur is placed
• Lock rotary instrument
Straight head piece

11. CLEANING OF HAND PIECE
 Do not use wire brush to clean the hand piece sheath
 Wipe it clean with alcohol immersed cloth or cotton swab
 Do not clean in an ultrasonic bath, boiling water nor chemicals.
 To clean the turbine cartridge - spray a lubricant into the drive air tube of the hand piece
 Spray into the drive air tube of the hand piece
 Run for a while to drive out excess oil.
 Repeat until dirty oil does not come out of the head