Figure 7-3. - Typical enclodontic box kit with supplies.

or "H-type" is a generic classification based on a manufacturing process and does not apply to any single design or line of instruments.

Numerical size designations and color coding are the same for both file types. Sizes begin with size 8 and continue through size 140. Files come in different lengths, including 19 mm, 21 mm, 25 mm, and 31 mm.

K-Type. - The K-type is tapered and pointed, with tight spiral cutting edges arranged so that the cutting occurs on either a pushing or pulling stroke. They are used to enlarge the root canal by a rotary cutting or abrasive action. When pulling the instrument out of the tooth, the cutting edges scrape against the wall, gouging and removing dentin in a filing action. When the instrument is turned in a