Patent ID: 6059569
Filing Date: 2000-05-09
Classification: A61C

Abstract:
An apical position detection apparatus for detecting an apical position by arranging an oral electrode in an oral cavity and a measuring electrode in a root canal, supplying an alternating current signal between the measuring electrode and the oral electrode, and detecting the apical position on the basis of the measurement signal obtained when the measuring electrode reaches the apical position, which comprises:first measuring means for obtaining a first measurement signal by supplying a first frequency signal between the measuring electrode and the oral electrode;second measuring means for obtaining a second measurement signal by supplying a second frequency signal between the measuring electrode and the oral electrode;arithmetic means for obtaining a logarithmically converted calculation value by using the first measurement signal obtained by the first measuring means and a second measurement signal obtained by the second measuring means; andposition signal formation means for obtaining an apical position detecting signal by addition or subtraction of the first measurement signal and the arithmetic value.