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In the assortment: 6.8.10.15.20.25.30.35.40. as. 15-40. assistant 45-80
H-file (Н-Ше, Н - the initial letter of the name of the first manufacturer - Hedstrom). The tool is made by turning from a blank with a round cross-section. In the domestic set of endodontic instruments, it is known as a drill bit. It has the maximum angle between the cutting face and the longitudinal axis - 60 °, as well as the largest number of cutting planes - from 31 to 14. This causes a higher cutting capacity than the Do-tools. However, it has less strength, which can lead to breakage, due to the fact that during manufacture, metal fibers are interrupted in places of processing by a milling cutter. Movements in the channel are vertical, the cutting ability is realized at the exit from the channel. A rotation of no more than 1/4 turn is allowed. When working, it is usually selected 1 size smaller than the previous tool. The symbol is a circle.
Sizes: 6.8.10.15.20.25.30.35.40. as. 15-40. assistant 45-80
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