Dental handpiece

Abstract

The objective of this invention is to provide a dental handpiece that improves the positional stability of a movable pin member along a groove, thereby improving the stability of the file amplitude. The solution involves forming a spiral groove (224) on the pin guide member (22) at the front end of the rotating member (2), extending in a spiral shape centered on the center of the pin guide member (22). The spiral groove (224) partially expands radially outward toward the pin guide member 22, thereby forming three pin stops P1, P2, and P3. The pin stops Pi (i = 1, 2, ...) are formed to have sufficient dimensions to allow at least a portion of the pin member (222) (e.g., a cross-sectional area ratio of 50% or more) to enter it.

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