Root canal length measuring instrument

Abstract

The invention relates to a root canal length measuring instrument, which includes a power supply, a signal acquisition circuit, a signal processing circuit, and a display. The signal acquisition circuit is composed of a reference electrode and a detection electrode. Human body resistance, the signal acquisition circuit is connected to the signal processing circuit; the signal processing circuit is provided with a reference resistance, and the signal processing circuit judges the difference between the human body resistance and the reference resistance, and calculates the distance between the end of the detection electrode and the apical foramen; The reference resistance is an equivalent resistance, and the reference resistance is connected with a reference calibration circuit, and the equivalent resistance of the reference calibration circuit is roughly equal to 6.5KΩ. The root canal length measuring instrument of the present invention eliminates the defect of inaccurate length measurement caused by the change of the reference resistance caused by the change of the environmental conditions by setting the reference calibration circuit, and has great economic value and practical value.

Description

(1) Technical field [0001] The invention relates to a tooth root canal length measuring instrument. (2) Background technology [0002] The root canal length measuring instrument is used to measure the length of the root canal to ensure that doctors can accurately grasp the length of the root canal during root canal treatment and improve the success rate of root canal treatment. [0003] The principle of the electronic root canal length measuring instrument is based on the previous scientific research results of Suzuki (1942) and Sunada (1962). In 1958, Japanese scholar Sunada found that the resistance value between the periodontal ligament and the oral mucosa was constant, about 6.5kΩ, by direct current test. On this basis, the resistance-type apical foramen measuring instrument was manufactured and put on the market. One end of the root canal length measuring instrument is connected to the oral mucosa through the oral hook, and the other end is connected to the root canal...

AI Technical Summary

Problems solved by technology

However, in actual operation, since the reference resistance is a certain value, changes in the temperature and humidity of the environment will cause changes in the reference resistance, and because the length of the root canal is generally only a few millimeters, a small change in the reference resistance will cause inaccurate measurement of the root canal length , thus limiting the practical application of the root canal length measuring instrument

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