Figure 7-4. - Items and inventory levels of endodontic box kits.

Figure 7-5. - Endodontic explorers.

clockwise, rotary action, the cutting edges scrape the wall and widen the preparation in a reaming action. K-type root canal files (fig. 7-8) are, size for size, stiffer and stronger than comparable types of files. The identification symbol for K-type files is a square.

H-Type. - The H-type are tapered and pointed, with spiral cutting edges arranged so that cutting occurs principally on the pulling stroke. These files also know as "Hedstrom" (fig. 7-9) are used to enlarge the root canal by either a cutting or an abrasive action. The series of intersecting cones forming the file become successively larger from the tip toward the handle. The sharp blades of the H-type files cut more quickly than reamers or K-files. The H-type files are frequently used for flaring of the canal from the apical region to the occlusal or incisal opening. The identification symbol for H-type files is a circle.