File shapes Flashcards
1
Q
what is the action of a positive rake angle?
A
Cutting
- may take less time to clean / shape because take more away but may not always be a good thing
2
Q
What is the action of a negative rake angle?
A
Scrapping
3
Q
shape of heastrom and action
A
tear drop shape and only cut during a pulling motion / stroke with spiral edges
- cuts in the up-stroke of the push/pull motion
- circumferential filing
- used for retrieval of GP and separated instruments
- have a positive rake angle
4
Q
what are the instruments that have a negative rake angle? positive?
A
Negative
- triangular files and reamers
- square files and reamers
- diamond k-flex
Positive
- tear drop Headstrom H file
