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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
List the options for finishers:
F1-F5
26
ProTaper Gold have what taper:
variable
27
How are the tapers listed for ProTaper Gold files:
apical 3mm
28
Diameter of F2 -25/0.08 at D1, D2, and D3?
0.08 for all
29
Slide 17:
Don't know how to read
30
Shape of cross section of active portion of ProTaper Gold:
convex triangle
31
More flexible ProTaper Gold rotary file type:
Martensite
32
Benefits of Martensite:
more flexible, higher fatigue resistance, ability to prebend
33
TF? Heat up austenite in the canal and it will go back to martensite.
F? vice versa
34
R Phase:
Austenite
35
Types of martensite:
twinned, deformed
36
ProTaper Gold files are in this state at room temperature:
martensite
37
What keeps martensitic files martensitic at room temperature:
annealing and cooling
38
Austenite (traditional) characteristics:
superelastic, cant't be precurved, more likely to transport, high cutting efficiency, low cyclic fatigue resistnace, high torque resistnace
39
Martensite (newer) characteristics:
controlled memory, can be precurved, less likely to transport, lower cutting efficiency, high cyclic fatigue resistance, lower torque resistance
40
More likely to transport, austenite or martensite?
austenite, bc they always want to straighten out
41
TF? Austenite is more likely to transport despite the fact it is a superelastic file.
T
42
Higher cutting efficiency, austeite or martensite?
austenite
43
Higher cyclic fatigue resistance, austenite or martensite?
maretensiite
44
Higher torque resistance, austenite or martensite?
austenite
45
lab set up for rotary files:
10:1 reduction latch head, torque multiplier, speed dial just past neutral
46
Clinic setup of rotary files:
electric motor, 8:1 contra angle, 300RPM
47
increase torque, increase/ reduce speed
red
48
How do traditional files differ from ProTaper Gold files?
2mm longer than protaper gold
49
Do the ProTaper Gold files have a shorter handle or flute?
handle
50
Set up for GG:
regular latch head, no multiplier, full speed
51
Step 1 of rotary instrementation:
get at least a 15 file to reach 2/3rd of ERL
52
Step 2: preflaring:
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
TF? SX si larger than both S1 and S2.
F smaller
54
Define brushing:
leaning against canal wall on outstroke
55
TF? Preflaring is done before finding WL.
T
56
Step 3:
Determine WL, develop a guide path
57
What is a glide path:
smooth, reproducible path to Wl, at least 15 file
58
Step 4:
2,3,4 GG in step back (all files go to Wl in this system)
59
Step 5:
S1 (purple) to WL in brushing motion, I&P, S2 (white) to WL in brushing motion I&P
60
When to dry the canal with the air syringe:
never
61
Step 6
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
Step 7:
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
Step 8:
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
Largest roatary file to use:
F3 (blue) w 35 (green) hand, the rest hand files only
65
TF? We must always go up to F3 rotary file.
F
66
Step 9:
If MAF larger than last rotary file, do a 1mm step back w hand files from MAF to 60 file
67
How to remove rotary file if it gets stuck:
reverse
68
How many passes to use with the shapers and filers:
few w shapers, only one with finishers
69
When and how to clean flutes;
after each use, alcohol gauze
70
When to use Prolube:
especially for calcified canals
71
Adv of rotary:
red canal debris thru apex, fewer dentin plugs, less transportation, smooth walls, more predictable outcome
72
Disadv of rotary:
system selection, learninb curve, cant do everything, breakage, cost/investment, user temperament
73
Is GP compressible?
no
74
Is GP compactible ?
yes, no molecular spring back

Endodontics (22 decks)

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