Operative Dent. (8-25)

Question 1

operative dentistry

Answer 1

science and art that studies the prevention, diagnosis, treatments of enamel & dentiin

Question 2

operative dentistry

Answer 2

science and art that studies the prevention, diagnosis, treatments of enamel & dentiin

Question 3

carious lesion

Answer 3

caused by bacterial infection

Question 4

non carious lesion

Answer 4

loss of surface tooth structure - mechanical or chemical factors

Question 5

direct restoration

Answer 5

dental material placed in a soft state directly in cavity preparation - amalgam/composit

Question 6

indirect restoration

Answer 6

a restoration fabricated outside the oral cavity then cemented or bonded to tooth - crowns

Question 7

slow speed handpiece

Question 8

high speed handpiece

Answer 8

> 200,000rpm - need water coolant - used to prep teeth and remove old restorations

Question 9

the greater the number of blades…

Answer 9

the smoother the finish

Question 10

carbide blades are used for ____

Answer 10

intracoronal preparations

Question 11

diamond blades are used for ____

Answer 11

extracoronal preparations

Question 12

abrasive cutting (diamond burs)

Answer 12

more efficient with brittle materials - not efficient with ductile material due to plastic deformation

Question 13

rake face

Answer 13

surface that forms the chip - the surface of the blade towards the direction of cutting

Question 14

clearance face

Answer 14

surface that clears the chips - away from direction of cutting

Question 15

edge angle

Answer 15

between the rake and clearance surfaces

Question 16

rake angle

Answer 16

between the radial line and the rake face

Question 17

clearance angle

Answer 17

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

Question 18

positive rake angle

Answer 18

when the radius is ahead of the rake face - higher cutting efficiency - larger chips produced -

Question 19

negative rake angle

Answer 19

when the rake face is ahead of the radius - dec. cutting efficiency -

Question 20

Black’s Instrument Formula (3 digit)

Answer 20

1st number - width of the blade in tenths
2nd # - length of the blade
3rd - angle of the blade to the long axis of the handle

Question 21

direct cutting

Answer 21

force applied is perpendicular to cutting edge - enamel hatchet

Question 22

direct cutting

Answer 22

force applied is perpendicualr to cutting edge - enamel hatchet

Question 23

indirect cutting/lateral cutting

Answer 23

force is exerted parallel to the cutting edge - enamel hatchet or gingival margin trimmer - motion from the beveled to the non beveled side -

Question 24

carious lesion

Answer 24

caused by bacterial infection

Question 25

non carious lesion

Answer 25

loss of surface tooth structure - mechanical or chemical factors

Question 26

direct restoration

Answer 26

dental material placed in a soft state directly in cavity preparation - amalgam/composit

Question 27

indirect restoration

Answer 27

a restoration fabricated outside the oral cavity then cemented or bonded to tooth - crowns

Question 28

slow speed handpiece

Question 29

high speed handpiece

Answer 29

>200,000rpm - need water coolant - used to prep teeth and remove old restorations

Question 30

the greater the number of blades...

Answer 30

the smoother the finish

Question 31

carbide blades are used for ____

Answer 31

intracoronal preparations

Question 32

diamond blades are used for ____

Answer 32

extracoronal preparations

Question 33

abrasive cutting (diamond burs)

Answer 33

more efficient with brittle materials - not efficient with ductile material due to plastic deformation

Question 34

rake face

Answer 34

surface that forms the chip - the surface of the blade towards the direction of cutting

Question 35

clearance face

Answer 35

surface that clears the chips - away from direction of cutting

Question 36

edge angle

Answer 36

between the rake and clearance surfaces

Question 37

rake angle

Answer 37

between the radial line and the rake face

Question 38

clearance angle

Answer 38

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

Question 39

positive rake angle

Answer 39

when the radius is ahead of the rake face - higher cutting efficiency - larger chips produced -

Question 40

negative rake angle

Answer 40

when the rake face is ahead of the radius - dec. cutting efficiency -

Question 41

Black's Instrument Formula (3 digit)

Answer 41

1st number - width of the blade in tenths 2nd # - length of the blade 3rd - angle of the blade to the long axis of the handle

Question 42

Black's Instrument Formula (4 digit)

Answer 42

1st - width of the blade 2nd - primary cutting edge 3rd - length of the blade 4th - angle of the blade relative to the long axis

Question 43

direct cutting

Answer 43

force applied is perpendicualr to cutting edge - enamel hatchet

Question 44

indirect cutting/lateral cutting

Answer 44

force is exerted parallel to the cutting edge - enamel hatchet or gingival margin trimmer - motion from the beveled to the non beveled side -