Endo Instruments + techniques + files Flashcards
Name the different endo motions
- Filing
- Envelope of motion
- Watch winding
- Balanced force
Filing technique
1/4 to 1/2 clockwise
Watchwinding technique
Back and forth
30 - 60 degrees
Envelope of motion technique
360 degrees
Balanced force technique
1/4 turn clockwise
1/2 turn counterclockwise
Use of barbed broach
Extirpation
Use of Hedstroem file
Remove GP or fractured instruments
What material are K files made from?
Stainless Steel
mm for cutting flute of K files
16mm
What material are ProTaper files made from?
Nickel Titanium
Advantages of NiTi files vs SS
Superelasticity
Greater taper
Increased cutting efficiency
Increased flexibility
Disadvantages of NiTi files vs SS
Instrument fracture
Expense
Access for posteriors
Reasons for instrument separation (2)
Torsional stress
Flexural stress
Steps for Protaper hand files (NiTi)
Access
10k 2/3rds EWL (balanced force)
CWL with EAL
10k CWL (balanced force)
15k CWL
S1 - Coronal 3rd
S2 - Mid 3rd
SX - Auxiliary file open up orifice
F1
F2
Steps for Modified Double Flare - GG+K files
Access
10k 2/3rds EWL
GG4 2/3rds
GG3 2/3rds
GG2 2/3rds
CWL with EAL
15k CWL
20k CWL
25k CWL
30k until file binds, then take 2 next file sizes up to CWL to create apical stop + decide MAF
Stepback technique
1 size larger than MAF -1mm CWL
40k - 23mm
45k - 22mm
50k - 21mm
How do we decide what file of RECIPROC to use?
R25 - narrow/invisible on PA (20K not passive to WL)
R40 - medium (20K passive to WL)
R50 - large (30k passive to WL)
RECIPROC steps
Access
10k 2/3rds EWL
15k 2/3rds EWL
R25 2/3rds EWL
CWL with EAL
R25 to CWL
Maxillary roots + canals
Central - 1 - 1
Lateral - 1 - 1
Canine - 1 - 1
1st premolar - 2/3 - 2
2nd premolar - 1/3 - 1
First molar - 4 - 3
Second molar - 3 - 3
Mandibular roots + canals
Central - 1- 1
Lateral - 1 - 1
Canine - 1- 1
1st premolar - 1 -1
2nd premolar - 1 -1
First molar - 2/3 - 3
Second molar - 2 - 3
