Maillefer Instruments Holding Sarl

Francois Aeby

Roman Merz

Cyril Botteron

Pierre-Andre Farine

Pierre-André Farine

Gilbert Rota

An apex-locating method and device for determining the depth position of the apex in a dental root canal. It uses a device making it possible to form a circuit including a first probe electrode inserted into the root canal of a tooth, a second electrode in conductive contact with an oral mucous membrane, frequency-generating elements able to produce alternating electrical signals at a number of frequencies, and elements for measuring electrical magnitude of alternating signals in the circuit. Provision is made for exciting the circuit and measuring the levels of magnitude of the alternating signals, respectively at low frequency and at high frequency and for detecting a point of intersection where the two levels measured at low and high frequencies meet and become substantially equal, these frequencies being sufficiently far apart for this point of intersection to exist. This point gives the position of the apex.

Method and device for determining the apical position in a dental root canal

A dental instrument for the extraction of an object from a root canal, comprising a shaft () having an open-end part () designed to receive at least a part of object (), this open-end part () able to be deformed to permit seizing object () by clamping and then extracting it from the root canal, is characterized in that open-end part () is tubular and is able to plastically deform, in a manner that involves a reduction of its inner section, under the effect of a given stress.

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Montagny, Switzerland

Francois Aeby