| 摘要 |
A handpiece for measuring root canal length comprises an outer sleeve that is substantially non-insulating, a connecting device, an instrument carrier, at least one transmission element within the outer sleeve, a length measuring circuit portion, a contact portion and an insulating portion. The instrument carrier is configured to receive a dental instrument. The transmission element transmits force to move the instrument carrier so that a dental instrument received in the instrument carrier executes a rotating, reciprocating and/or vibrating working movement. The length measuring circuit portion is disposed inside the handpiece and operable to transmit measuring signals for measuring length. The contact portion is operable to establish a conductive path between the dental instrument serving as an electrode and the length measuring circuit portion. The insulating portion insulates the length measurement circuit portion and the contact device, through which a voltage is applied during measurement, from the outer sleeve.
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