電気的根管長測定法の基礎的研究 : 電極の表面積とガラス製モデル根管の内径がメーター指示値に及ぼす影響  [in Japanese] Basic Studies on the Electronic Method for Measuring the Root Canal Length : Effects of Surface Area of Electrode and Inner Diameter of Glass Model Root Tube on the Meter-Indicating Values  [in Japanese]

Abstract

電気的根管長測定法については, より正確な測定法の確立を目的として, 測定値に影響を与える変動要因についての検索が続けられているが, いまだ解析不十分な点が多く残されている.そこで著書は, 電気的根管長の測定に当り, 根管にリーマーを挿入した際のメーター指示値の変化様相を知る基礎的資料を得る目的で, 根管に相当するガラス管を電解質溶液として用いた生理食塩水中に立てて, その中にリーマーと同一材質のステンレス鋼線より作製した非被覆電極と被覆電極を挿入した際のインピーダンスの変化を市販電気的根管長測定器を測定記録し, 電極と溶液との接触表面積およびガラス管内径の影響について検討した.その結果, ガラス管は抵抗として作用し, 内径が小さいほどその影響力は大きかった.非被覆電極に比べ被覆電極は溶液との接触表面積が一定となるため, 一定の被覆電極を溶液中のガラス管内に挿入したときのメーター指示値は, 電極の先端がガラス管内にあると, その影響を受けて低下したが, ガラス管外にあると必ず一定値となった.

With regard to the present electronic method for measuring the root canal length, various studies are being carried out especially on variable factors having effects on measured values, purposing to establish more accurate measuring method.But, it still involves many problems to be solved.The author, in the present study purposing to get fundamental data showing the phases of change in meter-indicating values that appear in case the reamer is inserted into a root canal in the process of measuring its length by the present electronic method, using glass tubes in place of root canals to be erected in the normal saline solution used as electrolytic solution, into which inserts uncovered or covered electrode made of stainless steel wire the same material as of reamer, to measure and record the change in impedance by the electronic apparatus for measuring the root canal length on the market, and examined the effects of the surface area of electrode contacted with solution and the inner diameter of glass tube.The following results were obtained.The glass tube functioned as impedance and its effect became larger, in case it was smaller in inside diameter.The covered electrode, different from the uncovered one, had a fixed surface area to be in contact with the solution.Consequently, when it was inserted into the glass tube in the solution, the meter-indicating value became low, and constant without fail once the electrode came out of the glass tube.

Journal

Journal of the Japanese Society for Dental Materials and Devices   [List of Volumes]

Journal of the Japanese Society for Dental Materials and Devices 2(3), 290-297, 1983-05-25  [Table of Contents]

The Japanese Society for Dental Materials and Devices (JSDMD)

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Codes

  • NII Article ID (NAID) :
    110002988928
  • NII NACSIS-CAT ID (NCID) :
    AN00127279
  • Text Lang :
    JPN
  • ISSN :
    02865858
  • Databases :
    NII-ELS 

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