1. A tool for processing the root canal of the tooth, equipped with a plastic handle on a metal rod-shaped main structure, while the main structure contains a working section having a tapering tip for insertion into the root canal during use, and a connection section immersed in the thickness of the handle, reaching to the end by the wide side of the working section, while the working section and the connection section are made using the same processing method. 2. A tooth root canal treatment tool according to claim 1, wherein the joint portion comprises at least a concave portion and / or a convex portion. A tooth root canal treatment tool according to claim 1, wherein the joint portion comprises a plurality of intersecting helical grooves. A tooth root canal treatment tool according to claim 1, wherein the joint portion comprises a plurality of twisted portions extending along opposite axes. A tooth root canal processing tool according to claim 1, wherein the working portion and the joint portion provided on the main structure are made as an integer part around the same central axis. A method for manufacturing a tool for treating a root canal of a tooth equipped with a plastic handle on a metal rod-like basic structure, comprising the steps of: performing, using the same processing method, a work section having a tapering tip for insertion into the root canal during use, and a joint section, immersed in the thickness of the handle, continuing to the end on the wide side of the working section of the main structure； inject plastic for1. Инструмент для обработки корневого канала зуба, снабженный пластмассовой ручкой на металлической стержневидной основной конструкции；при этом основная конструкция содержит рабочий участок, имеющий сужающийся кончик для введения в корневой канал при использовании, и участок соединения, погруженный в толщу ручки, доходящий до конца на широкой стороне рабочего участка, при этом рабочий участок и участок соединения выполнены с помощью од
