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How to distinguish between root canal file and enlarged needle

2014-06-04

　　Root canal enlargement needle rotary drilling has strong cutting ability, strong penetration force, and the formed root canal wall is smooth, suitable for penetrating the root canal and cutting the side wall, but it is easy to form a step or side penetration in a curved root canal. The root canal file has strong pulling and cutting force and is not easy to break. It is used for bending the root canal and is not easy to penetrate sideways. It is suitable for elliptical, uneven, and irregular root canals. Generally speaking, the two should be used alternately. For straight and thick root canals, enlargement needles are used first, and for curved root canals, files are used first, and then alternately.