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Endodontics > Rotary Instrumentation > Flashcards

Rotary Instrumentation Flashcards

1
Q

Direction of canal calcification:

A

canal down

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2
Q

Preflaring:

A

larger files, coronal 3rd 2/3, to remove coronal constriction BEFORE WL

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3
Q

Adv of preflaring:

A

allows Smaller files to get to apical 3rd, better Tactile feel of apical constriction, Red file Separation (check), better Apex Locator reading

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4
Q

Taper of hand files:

A

.02

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5
Q

Length of cutting flutes:

A

16mm (D0-D16)

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6
Q

Laragest diameter hand file:

A

(16 * 0.2) + file size

0.32 + file size

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7
Q

What is the diameter of a #30 file at D16:

A

(16 * 0.02) + .30 + 0.62

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8
Q

D0 starts here:

A

first cutting flute

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9
Q

TF? rotary files have the same tapers.

A

F

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10
Q

Common tapers:

A

0.04 0.06, 0.08mm

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11
Q

DIameter of 0.02 file at D16:

A

0.32mm

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12
Q

Diameter of 0.06 file at D16

A

0.96

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13
Q

Can you have the same apical diameter with different tapers?

A

yes

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14
Q

Type of rotary file we use:

A

Protaper Gold

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15
Q

Size of purple rotary file:

A

18

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16
Q

Siae of white rotary file:

A

20

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17
Q

Size of yellow rotary files:

A

20 at tip, but tapered differently than white file

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18
Q

What two color rotary files have 20 diameter at tip?

A

whte and yellow

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19
Q

V:

A

variable taper, only give you the apical 3rd (3mm?)

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20
Q

Technique to use w the ProTaperGold

A

crown down

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21
Q

2 types of ProTaperGold files:

A

shapres, finishers

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22
Q

ProTaper gold files to use for coronal 2/3:

A

shapers

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23
Q

ProTaper gold files to use for apical 1/3:

A

finishers

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24
Q

List the options for shapers;

A

sx, s1, s2

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25
Q

List the options for finishers:

A

F1-F5

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26
Q

ProTaper Gold have what taper:

A

variable

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27
Q

How are the tapers listed for ProTaper Gold files:

A

apical 3mm

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28
Q

Diameter of F2 -25/0.08 at D1, D2, and D3?

A

0.08 for all

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29
Q

Slide 17:

A

Don’t know how to read

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30
Q

Shape of cross section of active portion of ProTaper Gold:

A

convex triangle

31
Q

More flexible ProTaper Gold rotary file type:

A

Martensite

32
Q

Benefits of Martensite:

A

more flexible, higher fatigue resistance, ability to prebend

33
Q

TF? Heat up austenite in the canal and it will go back to martensite.

A

F? vice versa

34
Q

R Phase:

A

Austenite

35
Q

Types of martensite:

A

twinned, deformed

36
Q

ProTaper Gold files are in this state at room temperature:

A

martensite

37
Q

What keeps martensitic files martensitic at room temperature:

A

annealing and cooling

38
Q

Austenite (traditional) characteristics:

A

superelastic, cant’t be precurved, more likely to transport, high cutting efficiency, low cyclic fatigue resistnace, high torque resistnace

39
Q

Martensite (newer) characteristics:

A

controlled memory, can be precurved, less likely to transport, lower cutting efficiency, high cyclic fatigue resistance, lower torque resistance

40
Q

More likely to transport, austenite or martensite?

A

austenite, bc they always want to straighten out

41
Q

TF? Austenite is more likely to transport despite the fact it is a superelastic file.

A

T

42
Q

Higher cutting efficiency, austeite or martensite?

A

austenite

43
Q

Higher cyclic fatigue resistance, austenite or martensite?

A

maretensiite

44
Q

Higher torque resistance, austenite or martensite?

A

austenite

45
Q

lab set up for rotary files:

A

10:1 reduction latch head, torque multiplier, speed dial just past neutral

46
Q

Clinic setup of rotary files:

A

electric motor, 8:1 contra angle, 300RPM

47
Q

increase torque, increase/ reduce speed

A

red

48
Q

How do traditional files differ from ProTaper Gold files?

A

2mm longer than protaper gold

49
Q

Do the ProTaper Gold files have a shorter handle or flute?

A

handle

50
Q

Set up for GG:

A

regular latch head, no multiplier, full speed

51
Q

Step 1 of rotary instrementation:

A

get at least a 15 file to reach 2/3rd of ERL

52
Q

Step 2: preflaring:

A

S1 file (purple) to 2/3 length in brushing motion, I&P, S2 (white) to 2/3 L in brushing motion, I&P, can also use SX

53
Q

TF? SX si larger than both S1 and S2.

A

F smaller

54
Q

Define brushing:

A

leaning against canal wall on outstroke

55
Q

TF? Preflaring is done before finding WL.

A

T

56
Q

Step 3:

A

Determine WL, develop a guide path

57
Q

What is a glide path:

A

smooth, reproducible path to Wl, at least 15 file

58
Q

Step 4:

A

2,3,4 GG in step back (all files go to Wl in this system)

59
Q

Step 5:

A

S1 (purple) to WL in brushing motion, I&P, S2 (white) to WL in brushing motion I&P

60
Q

When to dry the canal with the air syringe:

A

never

61
Q

Step 6

A

F1 (yellow) straight in and out, I&P, gauge apex w a 25 (red) file, if it doesn’t reach WL, done w C&S, if it does continue

62
Q

Step 7:

A

F2 (red) straight in and out, I&P, gauge your apex with a 30 (blue) file, if it doesn’t reach WL you’re done w C&S, if it does continue

63
Q

Step 8:

A

F3 (blue) straight in and out, gauge your apex with a 35 (green) file, if it doesn’t reach WL you’re odne w C&S, if it does finish case w hand files

64
Q

Largest roatary file to use:

A

F3 (blue) w 35 (green) hand, the rest hand files only

65
Q

TF? We must always go up to F3 rotary file.

A

F

66
Q

Step 9:

A

If MAF larger than last rotary file, do a 1mm step back w hand files from MAF to 60 file

67
Q

How to remove rotary file if it gets stuck:

A

reverse

68
Q

How many passes to use with the shapers and filers:

A

few w shapers, only one with finishers

69
Q

When and how to clean flutes;

A

after each use, alcohol gauze

70
Q

When to use Prolube:

A

especially for calcified canals

71
Q

Adv of rotary:

A

red canal debris thru apex, fewer dentin plugs, less transportation, smooth walls, more predictable outcome

72
Q

Disadv of rotary:

A

system selection, learninb curve, cant do everything, breakage, cost/investment, user temperament

73
Q

Is GP compressible?

A

no

74
Q

Is GP compactible ?

A

yes, no molecular spring back

Endodontics (22 decks)

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