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Operative > Operative Final > Flashcards

Operative Final Flashcards

1
Q

Slow speed handpiece
Speed
efficiency
use

A

12,000 rpm
Less efficient, more controlled
Controlled removal, cleaning, finishing, polishing

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2
Q

High speed
speed
efficiency
use

A

> 200,000 rpm
high efficiency
tooth prep and removal of old restorations

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3
Q

Small hole
Big hole
Tiny holes on top
bottom small hole

A

Drive air
Exhaust
Coolant (water and air)
Fiber optic

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4
Q

Bladed instrument use

blades per bur

A

Excavating: 6 or 8
Finishing: 10-20

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5
Q

Finishing bur colors blades per bur
Red
Yellow
White

A

Red: 10-12
Yellow: 16-20
White: 30

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6
Q

Bladed instrument material

A

Tungsten carbide

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7
Q

Bladed instrument use

A

Intracoronal preps

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8
Q

Diamond type of cutting

use

A

abrasive

Extracoronal preps

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9
Q

Diamond color for abrasiveness

A 
Yellow: superfine
Red: fine
Blue: medium
Green: coarse
Black: supercoarse
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10
Q

Types of other abrasives

A

Coated

Molded

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11
Q

330 bur
length
taper
diameter

A

1.5 mm
8 degrees
.8 mm

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12
Q

245 burr
length
taper
diameter

A

3 mm
4 degrees
.8 mm

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13
Q

End cutting number

A

900

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14
Q

Cross cutting number

A

500 and 700

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15
Q

Abrasive cutting is more efficient with ____ materials

A

Brittle (makes microcracks)

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16
Q

Ductile fracture

A

plastic deformation by shearing

Dentin

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17
Q

Brittle fracture

A

crack formation upon tensile loading

Enamel

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18
Q

Edge angle: between

A

rake and clearance surface

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19
Q

Rake angle: between

A

Radial line and rake face

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20
Q

Clearance angle: clearance between

A

cutting edge and tooth structure

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21
Q

Positive rake angle is a _____ angle with radial line _____ rake face

A

Acute angle with radial line in front of rake face

22
Q

Negative rake angle has _____ cutting efficiency and cutting edge is _____ likely to fracture

A

Less

Less

23
Q

Hand cutting instrument blade and handle material

A

Blade: carbon steel
Handle: stainless steel

24
Q

Angulation of blade is always less than

A

50

25
Q

Hatchet scraping motion

A

From non beveled to beveled

26
Q

Enamel hatchet use

A

Direct and lateral cutting

27
Q

Gingival margin trimmer use

A

Lateral cutting

28
Q

Excavator Family (4)

A

Ordinary hatchet
Hoes
Angle former
Spoon

29
Q

Recurrent/secondary caries

A

Caries under preexisting faulty restoration

30
Q

Class I

A

occlusal surfaces of premolars/molars

lingual pit near cingulum of maxillary incisors

31
Q

Class II

A

Proximal surfaces of premolars and molars

32
Q

Class III

A

Proximal surfaces of incisors and canines

33
Q

Class IV

A

Proximal surfaces of incisors and canines PLUS incisal edge

34
Q

Class V

A

Gingival 1/3 of facial or lingual surfaces

35
Q

Class VI

A

Incisal edge of anterior teeth or cusp tips of posterior teeth

36
Q

Fundamenal concepts for all tooth preps

A

1: remove caries
2: removal weak tooth structure
3: pulp protection

37
Q

Cavosurface margin is junction between

Must be ___ degrees

A 
External walls of cavity prep and uncut tooth surface
90 degrees (butt joint)
38
Q

Outline Form
description
Depends on

A

Shape of cavity prep, perimeter of prep in width, length depth
Depends on location and extend of carious lesion
Extension for prevention vs conservation

39
Q

Conserve a ridge unless less than ____ mm of enamel

A

less than .5mm

40
Q

Resistance form

Definition

A

ability to withstand forces that are directed toward the long axis of tooth

41
Q

Resistance form principles (5)

A 
Remove undermined surface enamel
Flat pulpal floor and angulation
Depth
Rounded internal line angles
Material
42
Q

Amalgam must be ___ mm thick to withstand forces

A

1.5mm

43
Q

Retention form

A

Making opposing wall parallel or converging toward the occlusal to prevent dislodgment by lifting or tipping forces

44
Q

Convenience form

Properties (3)

A

Sufficient access to cavity for
Visibility (complete removal of decay)
Access to prep with instrument
Insertion of restorative material

45
Q

Finishing

A

finishing the cavosurface margin to prevent jagged outline

46
Q

Debridement

A

Rinse with air/water to remove debris

47
Q

Isthmus width shouldnot exceed

A

1/3 intercuspal distance

48
Q

enamel prisms ______ more from central groove to cusp

A

Diverge

49
Q

Minimal width of marginal ridge

A

1.6 mm

50
Q

Consequences of Class II

A

Adjacent tooth damage
Reduced tooth stiffness
Stress concentrators–>fractures
Margins in caries susceptible locations

Operative (1 decks)

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