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[Physical characteristics of endometric instruments].

A method for measuring and documentation of the physical characteristics of electronic root canal length determination instruments is presented and illustrated by evaluation of ten different devices. Important parameters such as the influence of the capacitive component in alternating current resistances are presented by means of impedance-charts. All devices examined worked with alternating current; regarding frequency, signal form and resistances, which the devices interpreted as "Apex", the measurements obtained varied. The advantages of this method for clinical and experimental studies are discussed by the author.