Kazan medical journalKazan medical journal0368-48142587-9359Eco-Vector6073810.17816/kazmj60738Research ArticleNew dental instrumentsShigabutdinovT. S.info@eco-vector.com3007196849481811202202112022021Copyright © 1968, Shigabutdinov T.S.1968<p>Root drill. Hand tool, the working part of which is made in the form of a tapered helical spiral with a sharp edge. Designed to expand and clean the root canal. Manufactured in five sizes: from d1 0.40 mm, d2 0.25 mm (No. 1) to d1 0.60 mm, d2 0.45 mm (No. 5).</p>Kazan Medical archiveКазанский медицинский архив