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Operative Final AU2016 > Dental instruments > Flashcards

Dental instruments Flashcards

1
Q

Rotation speed of a high speed

A

greater than 200,000 rpm

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2
Q

Rotation speed of a low speed

A

less than 12,000

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3
Q

Connector line of a high speed, how many holes?

A
  1. fiberoptic
  2. drive air
  3. exhaust
  4. coolant
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4
Q

Straight connector used for?

A

extraoral procedures

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5
Q

2 types of friction grip bur heads (theres also a latch type head)

A

Push button, bur tool type

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6
Q

3 parts of bur

A

shank, head, neck

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7
Q

Head of bur is usually what type of material

A

tungsten carbide

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8
Q

Neck and shank of bur are usually what type of material?

A

stainless steal

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9
Q

what are bladed burs used for

A

excavating tooth or finishing

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10
Q

The greater the number of blades of a bur the …. the finish

A

smoother

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11
Q

Bladed instrument are used for what kind of drilling?

A

intracoronal

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12
Q

Diamond burs are more abrasive so they’re used for… procedures

A

extracoronal (crown prep)

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13
Q

…. restoration: Dental material placed in a soft state directly in cavity prep to restore contour before it sets hard

A

direct

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14
Q

… restoration: fabricated outside the oral cavity and then cemented or bonded to tooth

A

indirect

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15
Q

Two types of handpieces

A
  1. air driven

2. electric- popular, quieter, cuts with high torque, less stalling, smoother cutting

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16
Q

In regards to the coupler, what does the high speed have that the slow speed does not have?

A

fiberoptic

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17
Q

Distal diameter of a 330 bur

A

0.8mm

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18
Q

Length of 330 bur

A

1.5mm

19
Q

Taper of a 245 bur

A

4 degree

20
Q

Taper of a 330 bur

A

8 degree

21
Q

Length of a 245 bur

A

3mm

22
Q

Neck of a bur is thinner for

A

operators visibility

23
Q

2 mechanisms of cutting

A
  1. brittle fracture

2. ductile fracture

24
Q

Abrasive cutting is MORE efficient with … materials

A

brittle (like enamel) (micro cracks)

25
Q

Abrasive cutting is NOT efficient with…. material

A

ductile (dentin)

26
Q

Ductile fracture mechanism of cutting is…. deformation of the material by shearing

A

plastic

27
Q

Bladed cutting more efficient is MORE efficient with … material

A

ductile

28
Q

Blade design- The surface that forms the chip and the surface of the blade towards the direction of cutting

A

Rake face

29
Q

Blade design: The surface that clears the chip and that goes away from the direction of cutting

A

Clearance face

30
Q

The angle that provides clearance between the cutting edge and the tooth structure

A

clearance angle

31
Q

Angle between the radial line and the rake face

A

rake angle

32
Q

angle between the rake and clearance surfaces

A

edge angle

33
Q

… rake angle has a higher cutting efficiency and larger chips are produced. But there is a small chip space so its more likely to clog

A

Positive

34
Q

A rake angle is positive when the blade is… to the perpendicular

A

behind

35
Q

A rake angle is negative when the blade is … of the perpendicular

A

in front

36
Q

….rake angle has a decreased cutting efficiency and smaller chips are produced so there is no clogging

A

negative

37
Q

Purpose of the clearance angle

A

prevents blade from rubbing on the tooth surface

38
Q

…clearance angle means less friction, dulling minimized and bur life lengthened

A

Bigger

39
Q

Vibration and heat generation may lead to …

A

plural trauma and discomfort to the patient (water coolants used)

40
Q

1st number of the 3 unit instrument formula is the…

A

width of blade (10 = 1mm)

41
Q

2nd number of the 3 unit instrument formula is the

A

length of blade (7=7mm)

42
Q

3rd number of the 3 unit instrument formula is the

A

angulation of the blade to the long axis of the handle (14)

43
Q

Gingival margin trimmer does what kind of cutting?

A

lateral

Operative Final AU2016 (5 decks)

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