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Endodontics > Lec Endo Material 2 > Flashcards

Lec Endo Material 2 Flashcards

1
Q

12 steps to endo:

A

dx, infection control, access, debridement, WL instrument, canal prep, irrigation, drying, medicamentation, temp, obturation, resto

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2
Q

When to use screw in slow speed with torqu multiplier:

A

rotary files

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3
Q

slow speed arrangement for GG:

A

normal head, no torque multiplier

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4
Q

How many times slower does the torwue multiplier make the slow speed?

A

64X slower

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5
Q

Creator of first endo file:

A

Ed Maynard

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6
Q

Most commonly used stainless steel hand files:

A

K-files

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7
Q

Hand file sizes:

A

10-100

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8
Q

Size of tip of 100 file:

A

1mm

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9
Q

Size of tip of 10 file:

A

0.1mm

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10
Q

How to figure out the size of the tip of a file:

A

move decimal point of the size of the file 2 digits to the L

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11
Q

Diameter of file increases by:

A

0.02mm/mm starting at tip

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12
Q

Length of flute of files:

A

16mm

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13
Q

D0:

A

initial diameter

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14
Q

Name the parts of the hand file:

A

tip, flute, shank, handle

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15
Q

Organization that regulates file size:

A

International Standardizatoni Organization (ISO)

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16
Q

Name the 2 white hand files:

A

15, 45

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17
Q

Name the 2 green hand files:

A

35, 70

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18
Q

Name the 2 red hand files:

A

25, 55

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19
Q

Name the 2 black hand files:

A
  1. 80
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20
Q

Name the 2 yellow hand files:

A

20, 50

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21
Q

Name the 2 blue hand files:

A

30, 60

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22
Q

Color of 8 file:

A

gray (special size)

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23
Q

Special size files:

A

6, 8, 10, 12 (pink, grey, purple, orange)

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24
Q

How to choose file length:

A

tooth location in mouth, access, root length

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25
Q

Available file lengths:

A

21, 25, 31mm

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26
Q

Length of most spiral cutting edges of hand files:

A

16mm

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27
Q

Active part of hand file is almost always this length:

A

16mm, length of shank changes

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28
Q

Define taper:

A

the rate of inc of X-sectional diamter

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29
Q

ISO taper for manual files:

A

0.02

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30
Q

D0 for a 25 hand file:

A

.25

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31
Q

D1 for a 25 hand file:

A

0.27

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32
Q

D3 for a 25 hand file:

A

0.31

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33
Q

D16 for a 25 hand file:

A

0.57

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34
Q

Avg taper of a root canal:

A

0.02mm/mm

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35
Q

TF? Rotary files have the same taper as hand files.

A

F

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36
Q

Files w different tapers have the same:

A

tip diameter

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37
Q

Sharp angle at tip of file indicates:

A

cutting tip

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38
Q

Fxn of non cutting tips:

A

guidance

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39
Q

When to use non cutting tips:

A

less engagement of dentin, prevents transportation

40
Q

Files w tips that are non-cutting at UB:

A

15-80 files

41
Q

non-cutting tip is aka:

A

Roane tip

42
Q

TF? 8 and 10 files at UB are cutting.

A

T

43
Q

Files with this type of transverse cross-section are more cutting:

A

sharper angles

44
Q

transverse cross-section shaper that leads to less friction and more debris removal:

A

triangle (60’)

45
Q

transverse cross-section of most K-files:

A

square (90’) miles

46
Q

TF? The sharper the angle, the larger the angle.

A

F. the smaller

47
Q

Adv of stainless steel files:

A

resistant to corrosion, sterilizable, can prebend, rigidity increases w sized

48
Q

Composition of stainless steel files:

A

74% Fe, 18% Cr, 8% Ni

49
Q

Composition of nickel titanium files:

A

56% Ni, 44% Ti

50
Q

This provides torsion for hand files:

A

twisting of flutes (check)

51
Q

3 types of hand instruments:

A

Barbed Broaches, Reamers, Files

52
Q

Barbed broaches engage:

A

tissue only, removes cotton pellet, weaker instrument, fracture

53
Q

Use barbed broaches for:

A

pulpectomy

54
Q

Beware of this w barbed broaches:

A

will break if you touch the walls, never use in curved canals

55
Q

Reamers, cutting tip or non-cutting tip?

A

cutting tip

56
Q

TF? Reamers have fewer flutes that K-files.

A

T

57
Q

How do reamers cut?

A

rotational motion

58
Q

Do reamers have inc or dec flute space?

A

inc (fewer flutes)

59
Q

K-files, cutting tip or non-cutting tip?

A

cutting

60
Q

When do K-files cut?

A

insertion, withdrawal, clockwise and counterclockwise rotation

61
Q

Ideal way to enter canal:

A

little pressure, cut on the way out

62
Q

When do hedstrom files cut?

A

only w filing motion

63
Q

Hedstrom files:

A

ground spiral, aggressive cutting

64
Q

Are Hedstrom files more or less prone to separation?

A

more

65
Q

TF? You should only use a reaming motion with Hedstrom files.

A

F. never use reaming motion

66
Q

Design of Hedstrom files:

A

dec diamater

67
Q

TF? Hedstrom files can be used to remove pulp.

A

T

68
Q

Flex-R, aka:

A

Roane tip

69
Q

Are the tips of Flex-R files cutting or non-cutting

A

inactive, (non-cutting)

70
Q

Are Flex-R files grounded or twisted?

A

grounded

71
Q

Adv of NiTi files:

A

shape memory, superelasticity, resistance to cyclic fatigue, less cutting efficiency

72
Q

K files, more or less resistant than reamers?

A

less

73
Q

K file are only for:

A

cleaning

74
Q

Better flexibility, stainless steel or NiTi?

A

NiTi

75
Q

Heated martensite becomes:

A

austenite

76
Q

Undergoes deformation more easily, austenite or martensite?

A

martensite

77
Q

More resistant to fatigue, NiTi or SS files?

A

NiTi

78
Q

Less cutting efficiency, NiTi or SS?

A

NiTi

79
Q

More efficient overall, NiTi or SS?

A

NiTi

80
Q

32:1 reduction contra angle, more or less susceptible to fracture:

A

more

81
Q

Benefits of engine drive rotary instruments:

A

speed and torque control

82
Q

% fracture rate of NiTi hand instruments:

A

5%

83
Q

Effect of Nickel titanium rotary instrument fracture:

A

complicate or compromise RCT outcome

84
Q

3 main factors, clinical performance of NiTi depends on:

A

Design, Alloy/Manufacture, methods of use

85
Q

More susceptible to fracture (rotary NiTi):

A

Reduction Contra Angle (check)

86
Q

Lower taper, more or less space apically?

A

less

87
Q

What does less space apically mean”?

A

more debris can be forced apically

88
Q

TF? Higher tapers will cut more dentin coronal to point of contact.

A

T

89
Q

Variable taper files:

A

protaper

90
Q

Constant taper files:

A

profile

91
Q

Benefit to Protaper Gold:

A

metallurgical enhancement via heat tx technology, flexibility, memory (prebend), cyclic fatigue

92
Q

Portion of the canal shaped by S1 and S2:

A

cervical and middle

93
Q

Width of rubber stopper:

A

1.5mm

94
Q

Clean stands should be filled w this in cx

A

sodium hypochlorite (disposable sponge)

95
Q

How far to insert paper points:

A

to WL

96
Q

Obturation materials:

A

sealer, core (GP), instruments, devices

97
Q

Ideal fitting material:

A

easily places and removed, seal apically & laterally, no shrinkage, solid after insertion, impervious to moisture, doesn’t stain tooth, RGO, bacteriostatic, doesn’t irritate periapical tisue, sterile or sterilizable

Endodontics (22 decks)

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