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Perio > 35. Non-surgical therapy - manual and machine tools > Flashcards

35. Non-surgical therapy - manual and machine tools Flashcards

1
Q

Non surgical therapy-manual and machine tools

Hand instrumentation advantages

A
  • Good tactile sensation
  • Minimal aerosal production
  • Modified curettes=>increase efficiency

-Modified curettes- w/extended shanks =>deep pockets
-Mini-bladed currettes=>narrow pockets developed to increase efficiency

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2
Q

Non surgical therapy-manual and machine tools

Hand instrumentation Disadvantages

A
  • Aggressive use=>tooth substance removal
  • Technique sensitive
  • Require frequent sharpening
  • Limited access to furcations and base of deep pockets
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3
Q

Non surgical therapy-manual and machine tools

Parts of hand instruements

A
  • Working part(blade)
  • Shank
  • Handle
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4
Q

Non surgical therapy-manual and machine tools

Enables proper balance of instrument

A

Cutting edges of blade centered over long axis of handle

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5
Q

Non surgical therapy-manual and machine tools

Blade composition

A
  • Carbon steel
  • Stainless steel
  • Tungsten carbide
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6
Q

Non surgical therapy-manual and machine tools

Curette use

A

Scaling and root debridement

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7
Q

Non surgical therapy-manual and machine tools

Curette structure

A
  • Spoon shaped blade
  • Two cutting edges
  • Two edges united by rounded toe

Length and angulation of shank, dimensions of blade differ between different brands

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8
Q

Non surgical therapy-manual and machine tools

Sickle use

A

Supragingival debridement or scaling in shallow pockets

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9
Q

Non surgical therapy-manual and machine tools

Sickle structure

A
  • Curved or straight blade
  • Triangular in cross section
  • Two cutting edges
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10
Q

Non surgical therapy-manual and machine tools

Hoe use

A
  • Supragingival scaling
  • Blade can be positioned at four different inclincations in relation to shank-F, L, D, M
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11
Q

Non surgical therapy-manual and machine tools

Hoe structure

A
  • One cutting edge
  • Blade turned at 100 degree angle to shank w/ cutting edge beveled at 45 degree angle
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12
Q

Non surgical therapy-manual and machine tools

Periodontal files use

A

Smoothing roots in areas of stubborn deposits

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13
Q

Non surgical therapy-manual and machine tools

Two main groups of mechanical scalers

A
  1. Ultrasonic scalers
  2. Sonic scalers

  1. Convert electrical current into mechanical energy in form of high frequency vibrations
  2. Use air pressure to create mechanical vibration
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14
Q

Non surgical therapy-manual and machine tools

Vibration Frequency of sonic scalers

A

3000-8000 Hz

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15
Q

Non surgical therapy-manual and machine tools

Vibration Frequency of Ultra-sonic scalers

A

18000-45000

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16
Q

Non surgical therapy-manual and machine tools

Types of ultrasonic scalers

A
  1. Piezoelectric scaler
  2. Magnetostrictive scaler

  1. Ulternating electrical current causes dimensional change in handpiece-> vibrations
  2. Current produces magnetic field that causes instrument vibration
17
Q

Non surgical therapy-manual and machine tools

Piezoelectric scaler vibration frequency

A

25000-30000

Can reach upto 45000

18
Q

Non surgical therapy-manual and machine tools

Magnetostrictive scaler vibration frequency

A

25000-30000

can reach upto 45000

19
Q

Non surgical therapy-manual and machine tools

Difference between piezoelectric and magnetostrictive scalers

A

Pattern of vibration

20
Q

Non surgical therapy-manual and machine tools

Pattern of vibration for Piezoelectric scalers

A

Linear

Only lateral side of scaling tip used

21
Q

Non surgical therapy-manual and machine tools

Pattern of vibration for Magnetostrictive scalers

A

Elliptical

All surfaces of scaling tip are active

22
Q

Non surgical therapy-manual and machine tools

Types of piezoelectric scaler tips

A
  • Tiny
  • Thin
  • Periodontal probe type
  • Diamond coated
23
Q

Instruments cooled by water based medium containing polishing particles

A

Piezoelectric scaler

24
Q

Non surgical therapy-manual and machine tools

Decrease amount of contaminated aerosol compared to other ultrasonic scalers

A

Piezoelectric scaler

Perio (61 decks)

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