| 摘要 |
The problem which is intended to be solved by the present invention is to provide a new type of root canal file which, on one hand, is so flexible and has so good a strength that it can be moved also down into curved root canals without being broken and which, on the other hand, has a large capacity of removing material in the root canal. This problem is solved by a root canal file with a working part having two, helically along the working part extending, continuous cutting edges (8, 10) which are displaced in relation to each other in the longitudinal direction of the working part, so that each turn of one of the cutting edge helices is situated between tow turns following after each other of the other cutting edge helix. The invention also relates to a method of manufacturing such a root canal file, two continuous, helically extending grooves (4, 6) then being grinded in the outer surface of a file blank, said grooves being displaced in relation to each other in the longitudinal direction of the file blank, so that each helix turn of one of the grooves is situated between two helix turns following after each other of the other groove and so that the outer edges of the grooves are forming two continuous, along the file blank helically extending cutting edges (8, 10) which are displaced in relation to each other in the longitudinal direction of the file blank. The root canal file is primarily intended to be used by dentists at tooth root treatments. |
