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5th - APD > NiTi > Flashcards

NiTi Flashcards

1
Q

Features of traditional file?

A

Stainless steel
Standard shape (ISO)
Set taper 2%

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2
Q

What is taper?

A

Diameter of instrument increases from fit to handle

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3
Q

What does set taper 2% mean?

A

Each mm from tip increase 0.02mm

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4
Q

Smallest and largest K file?

A 
Small = 06
Large = 140
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5
Q

How long is traditional file?

A

16mm

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6
Q

3 main types of file?

A

K file
Flexible K file
Hedstrom file

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7
Q

What is K file?

A

Created twisting wire produce cutting flute

Square or triangle in cross section

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8
Q

What is flexible K file?

A

Similar K file but flexible

Can be made NiTi or SS

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9
Q

What is Hedstrome file?

A

Grinding of tapered blank

Round in cross section

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10
Q

Issue Hedstrom file?

A

Agressive

Not fine apical prep/narrow canal

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11
Q

What are techniques to use hand files?

A

Watch winding
Balanced force
Circumferential filing

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12
Q

What is watch winding?

A

30 degree watch wind each way following by pulling

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13
Q

What is balanced force?

A

60 degree clockwise and 120 degree anticlockwise

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14
Q

Disadv traditional files?

A 
Narrow canal shapes - poor irrigation
Inflexible in larger size 
Prone fracture 
Can create ledge 
Push debris into canal
Takes more time
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15
Q

What is NiTI?

A

Super elastic metal alloy - flexibility and shape memory

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16
Q

How are NiTi designed to be used?

A

W/ continuous motion

17
Q

Why NiTi more expensive?

A

Can’t be twisted to shape - have to be machined

18
Q

Why do NiTi remain centred in canal?

A

Have non-cutting tip

19
Q

What should NiTi not be used for?

A

Canal negotiation - only be used for enlargement

20
Q

Example NiTi system?

A

ProTaper

21
Q

How to use NiTi system?

A 
Crown down technique
Hand files create glide path - ideally 20K file 2/3 WL
Shapers are used 2/3 WL
Establish WL
Establish glide path WL
Finishing files
Apical gauge determine final finishing
22
Q

What files are used in ProTaper

A

3 shapes - SX,S1,S2

3 finishers - F1,F2,F3

23
Q

Features ProTaper?

A

Triangular cross section
Active cutting blade
Blunt tip = remain centred

24
Q

Use of shaping vs finishing files?

A

Shaping - coronal and middle third

Finishing - apical third prep

25
Q

Adv NiTI?

A 
Less canal transportation
Flexible - good curved canal
Less debris extrusion
Faster technique
Fewer files
26
Q

Disadv NiTI?

A

Torsional failure - unwinding

Flexural fatigue over-curved canal

27
Q

Tips for NiTI?

A

Always have glide path
Use light force/pecking motion
Don’t engage tight canal
Discard if sign of stress

28
Q

When are rotary files contraindicated?

A 
Tight/ scelorised canal
Curved canal
S shaped canal
Apical hook 
No glide path
29
Q

Safety feature of machine used w/ rotary file?

A

Torque - amount of resistance before machine cuts out

5th - APD (8 decks)

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