Influences of Electrical Resistance and Frequency in the Circuit on the Meter Indicating Value of an Apparatus for Measuring Root Canal Length

Abstract

In attempting to establish a more accurate electronic method for measuring root canal length, a previous study by Usui has shown that resistance and frequency in an electronic apparatus had an influence on the meter indicating value. The purpose of this study was to examine clinically the influences of electrical resistance and frequency in the apparatus on the meter indicating value during the application of the “Endotape Method”. The results indicated that the meter indicating value increased in accordance with an increase in resistance and became slightly greater with an increase in frequency. Application of the “Endotape Method” allows measurement of the root canal length even if there are conductive substances in the root canal.