The invention relates to dentistry, and more specifically - to the use of hand and machine endodontic instruments.The technical result of the proposed utility model is to improve the reliability through the use of the liner assembly of a different design, which allows the use of a hard material and the adapter fixing groove machine tool shank. In this locked three possible degrees of freedom: translation along the axis of symmetry, a rotational movement about this axis and the deviation from this axis.In case of use with a suitable tool shank 1 for the treatment of dental diseases medical worker selects a suitable type of tool, then fixes it in the adapter to an endodontic instrument and applies the tool in the patients mouth. In this process of fixing a medical worker first places the tool shank 1 in the hole 31, the device for orienting the dihedron 35 of the shank 1 as required to align ledge 15 with the second portion 18 (with the working surface 15, shoulder). The focus of the shank 33 abuts against the shoulder 1 15 of the second part 18 (the tool is inserted up to the stop 33). Then, a medical worker performs a combination of the second portion 18 of the first part 7. For this purpose it is passed through the endodontic tool clamping sleeve 4, until it clicks inserts part of a spherical type 19 in the clamping sleeve 4. The second side surface 5 should come into contact with the third end face 20. At the end of the medical worker combines a second portion 18 with the first part 7 so that the fourth side surface 29 of the second part 18 touched second inner surface 10 of the first part 7 and the protrusion 13 is aligned with the groove 34 of the shank 1 endodontic instrument.Полезная модель относится к стоматологии, более конкретно – к использованию ручных и машинных эндодонтических инструментов.Техническим результатом предлагаемой полезной модели является повышение надёжности за счёт использования иной конструкции узла крепления хвостовика, которая позволяет
