Device for measuring length of teeth root canal

Abstract

Disclosed a length-measuring instrument of root canal in the dentistry, relating to the a length measuring device, especially to a length measuring instrument for the root canal of human tooth. The invention provides a length-measuring instrument for the root canal of human tooth with easy operation, lower power consumption and lower cost. Wherein, the invention has a measuring circuit whose detecting head is connected to root of tooth; the input of digital comparator circuit is connected to the measuring circuit; the input of logic control circuit is connected to the digital ratio output of the digital comparator circuit; the input of audible-visual alarm circuit is connected to the logic control circuit; and the input of display circuit is connected to the compared result output of digital comparator circuit. The invention utilizes the analogue / digital conversion chip to realize the digital proportional operation which can simplify the circuit and reduce the cost compared to the micro-processing chip while its operational precision in theory can reach the 1 / 256 of input direct current voltage and the measured range can reach 16 statuses with better operability. The invention not only considers the property of product and the consumption of battery but also reduces the cost. In addition, the invention adds a buffer insulating stage between the detecting end and the sampling input, so it has better linearity of response change and higher sensibility.

Description

technical field [0001] The invention relates to a length measuring device, in particular to a measuring device for the length of human tooth root canal. Background technique [0002] Accurate measurement of the length of the root canal of the human tooth is a necessary step in the dental root canal treatment, which is related to the effect and success of the treatment. Conventional methods in the past were hand feeling measurement and X-ray imaging. The accuracy of the former is not good, and the latter requires multiple filming during the treatment process, which not only increases the cost of the patient, but also increases the risk of radiation exposure. [0003] In recent years, with the development of human oral histology, a simple, easy-to-use, and high-accuracy new electric root canal length measuring instrument has been developed. Since 1979, it has gone through three generations. The first generation (impedance method) is based on the design principle of the resis...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a device with good operability, low power consumption, etc. for the defects of poor operability, large power consumption, and high cost in existing root canal length measuring devices designed by using the ratio method and the frequency response relative value method. Power-saving and low-cost dental root canal length measuring instrument

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