Patent ID: 8348863

Claim:
A method of determining a length of a radicular canal (RCL) of a tooth in a mouth and a location of an apical foramen (LAF) of the tooth using a Radicular Spectral Attenuation Coefficient (RSAC), comprising: introducing a first electrode into the radicular canal of the tooth; attaching a second electrode to oral tissue of the mouth; applying a measurement signal to the radicular canal of the tooth by means of the first and second electrodes, the measurement signal comprising at least 4 different frequencies, each frequency having an applied voltage amplitude; measuring an electrical signal and determining relative spectral attenuation of voltage amplitude of the measurement signal as a function of frequency in order to determine an individual attenuation of voltage amplitude for each frequency; determining, based on the relative spectral attenuation of the measurement signal as a function of frequency, the Radicular Spectral Attenuation Coefficient (RSAC); and deriving, from the Radicular Spectral Attenuation Coefficient (RSAC), the length of the radicular canal and location of a tip of an endodontic file relative to the apical foramen of the tooth.