| 摘要 |
FIELD: medicine. ^ SUBSTANCE: invention relates to dentistry and can be used for treatment of teeth canals. Dental rotating machine cutting instrument in accordance with claimed invention contains cutting section, formed on the side of tip, shank, formed at the base, and thinner part, formed between cutting section and shank. Thinner part contains narrowing section, which is wider on tip side and more narrow on the base side, and rectilinear section, which has constant thickness with the same diameter as diameter of narrowing section on the base side. ^ EFFECT: location of breakage by shank side becomes limited and instrument service term before breakage increases. ^ 5 cl, 7 dwg |
