Dental material copy.pptx
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This document discusses dental handpieces. It defines a handpiece as a mechanical device that allows rotary instruments to turn and position intraorally. Handpieces are classified based on their driving mechanism, such as air, water, belt, or gear driven. The main parts of a handpiece include the head, shank, and connecting end. Handpieces also vary based on angle and speed. Low-speed handpieces rotate between 3000-20,000 rpm and are used for cleaning, caries removal, and polishing. High-speed handpieces rotate faster at 150,000-450,000 rpm and are better for tooth preparation and restoration due to less pressure and vibration. Rotary instruments attach to handpieces via different
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- 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