Operative Final

Question 1

Slow speed handpiece
Speed
efficiency
use

Answer 1

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

Question 2

High speed
speed
efficiency
use

Answer 2

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

Question 3

Small hole
Big hole
Tiny holes on top
bottom small hole

Answer 3

Drive air
Exhaust
Coolant (water and air)
Fiber optic

Question 4

Bladed instrument use

blades per bur

Answer 4

Excavating: 6 or 8
Finishing: 10-20

Question 5

Finishing bur colors blades per bur
Red
Yellow
White

Answer 5

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

Question 6

Bladed instrument material

Answer 6

Tungsten carbide

Question 7

Bladed instrument use

Answer 7

Intracoronal preps

Question 8

Diamond type of cutting

use

Answer 8

abrasive

Extracoronal preps

Question 9

Diamond color for abrasiveness

Answer 9

Yellow: superfine
Red: fine
Blue: medium
Green: coarse
Black: supercoarse

Question 10

Types of other abrasives

Answer 10

Coated

Molded

Question 11

330 bur
length
taper
diameter

Answer 11

1.5 mm
8 degrees
.8 mm

Question 12

245 burr
length
taper
diameter

Answer 12

3 mm
4 degrees
.8 mm

Question 13

End cutting number

Answer 13

900

Question 14

Cross cutting number

Answer 14

500 and 700

Question 15

Abrasive cutting is more efficient with ____ materials

Answer 15

Brittle (makes microcracks)

Question 16

Ductile fracture

Answer 16

plastic deformation by shearing

Dentin

Question 17

Brittle fracture

Answer 17

crack formation upon tensile loading

Enamel

Question 18

Edge angle: between

Answer 18

rake and clearance surface

Question 19

Rake angle: between

Answer 19

Radial line and rake face

Question 20

Clearance angle: clearance between

Answer 20

cutting edge and tooth structure

Question 21

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

Answer 21

Acute angle with radial line in front of rake face

Question 22

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

Answer 22

Less

Less

Question 23

Hand cutting instrument blade and handle material

Answer 23

Blade: carbon steel
Handle: stainless steel

Question 24

Angulation of blade is always less than

Answer 24

50

Question 25

Hatchet scraping motion

Answer 25

From non beveled to beveled

Question 26

Enamel hatchet use

Answer 26

Direct and lateral cutting

Question 27

Gingival margin trimmer use

Answer 27

Lateral cutting

Question 28

Excavator Family (4)

Answer 28

Ordinary hatchet Hoes Angle former Spoon

Question 29

Recurrent/secondary caries

Answer 29

Caries under preexisting faulty restoration

Question 30

Class I

Answer 30

occlusal surfaces of premolars/molars | lingual pit near cingulum of maxillary incisors

Question 31

Class II

Answer 31

Proximal surfaces of premolars and molars

Question 32

Class III

Answer 32

Proximal surfaces of incisors and canines

Question 33

Class IV

Answer 33

Proximal surfaces of incisors and canines PLUS incisal edge

Question 34

Class V

Answer 34

Gingival 1/3 of facial or lingual surfaces

Question 35

Class VI

Answer 35

Incisal edge of anterior teeth or cusp tips of posterior teeth

Question 36

Fundamenal concepts for all tooth preps

Answer 36

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

Question 37

Cavosurface margin is junction between | Must be ___ degrees

Answer 37

``` External walls of cavity prep and uncut tooth surface 90 degrees (butt joint) ```

Question 38

Outline Form description Depends on

Answer 38

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

Question 39

Conserve a ridge unless less than ____ mm of enamel

Answer 39

less than .5mm

Question 40

Resistance form | Definition

Answer 40

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

Question 41

Resistance form principles (5)

Answer 41

``` Remove undermined surface enamel Flat pulpal floor and angulation Depth Rounded internal line angles Material ```

Question 42

Amalgam must be ___ mm thick to withstand forces

Answer 42

1.5mm

Question 43

Retention form

Answer 43

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

Question 44

Convenience form | Properties (3)

Answer 44

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

Question 45

Finishing

Answer 45

finishing the cavosurface margin to prevent jagged outline

Question 46

Debridement

Answer 46

Rinse with air/water to remove debris

Question 47

Isthmus width shouldnot exceed

Answer 47

1/3 intercuspal distance

Question 48

enamel prisms ______ more from central groove to cusp

Answer 48

Diverge

Question 49

Minimal width of marginal ridge

Answer 49

1.6 mm

Question 50

Consequences of Class II

Answer 50

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