File shapes

Question 1

what is the action of a positive rake angle?

Answer 1

Cutting

- may take less time to clean / shape because take more away but may not always be a good thing

Question 2

What is the action of a negative rake angle?

Answer 2

Scrapping

Question 3

shape of heastrom and action

Answer 3

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

Question 4

what are the instruments that have a negative rake angle? positive?

Answer 4

Negative

• triangular files and reamers
• square files and reamers
• diamond k-flex

Positive
- tear drop Headstrom H file