DENTAL DRILL Russian patent published in 1998 - IPC

FIELD: medicine; stomatology. SUBSTANCE: dental drill has strengthened operating head with side and face repeating cutting teeth formed by front and rear surfaces, groove for removal of shavings, as well as tail piece for attachment to drive. Surface of side teeth are made in compliance with shape described by control system. Tangent to front surface is positioned at average front angle not exceeding the modulus of -16 deg. Tangent to rear surface, is at least the modulus of front angle. Surface layer of operating head, at least 0.05 mm deep, is made of strengthened plastically deformed material. Face teeth are positioned along generatrix of side teeth with slope of 30-60 deg. towards external diameter. Face surface is provided with additional tooth, for example of cross shape. Cutting teeth have mean time to first failure of 3 min, and every dental drill has sterile packing. EFFECT: higher technological effectiveness, sufficient strength. 3 cl, 5 dwg