If there is no more space to channel debris, the instrument becomes clogged and the debris does not flow out of the canal.

Remember that as the file is working, more debris is built-up in the coronal area of the instrument. Compression occurs when debris is caught between the canal wall and instrument flute. This allows for additional debris removal and channeling to occur in the flute space.

Once the instrument has made its cut into the dentin, the debris needs to move out of the way. The chips resulting from the K3 cutting action are easily dislodged from the working area and carried off via the file's unique helical angle as outlined in the next section. The K3 features a slightly positive rake angle for optimum cutting efficiently. The ideal rake angle is slightly positive, because an overly positive rake angle will result in digging and plowing of the dentin. As dentin is dense and somewhat resilient, cutting or chip dislodgment with negative rake angles is difficult and very inefficient.Īs previously noted, negative rake angles are inefficient and result in dentin scraping rather than cutting and chip dislodgment.

The Profile and most other conventional instruments utilize negative rake angles, which result in a scraping rather than a cutting action. It can also be measured relative the circumference as indicated by the green lines on the examples below. Rake angles are determined by drawing a centerline parallel to the center of the file and determining the angle relative to the centerline. Positive Rake Angle An instrument's cutting efficiency is dependant upon the overall rake angle of the instrument's cutting blades.

K3 note md1 db file