Dental hand engine
AssigneeKabushiki-Kaisha Dentronics
InventorToshio Arai
Life of this patent
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Abstract
A dental hand engine for driving a reamer for widening root canals, which is characterized in the provision of a control device which electrically senses the time when a forward end of the reamer reaches a radical apex for automatically stopping the engine and consequently the reamer.
Claims1
A dental hand engine for driving a reamer for widening a root canal of tooth, which comprises a body containing the engine and operable by fingers, switch means provided on said body for selectively operating the engine and the reamer connected to said engine, means for passing a micro current through the reamer, and electric circuit means for sensing electric resistances of the micro current passing through the reamer and for stopping the engine and reamer in response to a specific electric resistance said micro current has when the reamer reaches a radical apex.
Dependencies are inferred from the claim text.