과제정보
연구 과제 주관 기관 : 삼성의료원
Restorative Dentistry and Endodontics
- 제23권2호
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- Pages.676-681
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- 1998
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- 2234-7658(pISSN)
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- 2234-7666(eISSN)
주파수의존 근관장 측정기가 습윤한 근관내에서 근첨을 인지하게 되는 원리에 관한 연구
A STUDY ON THE MECHANISM BY WHICH THE FREQUENCY-DEPENDENT APEX LOCATOR DETECTS THE APEX OF THE ROOT IN MOIST CANALS
- Park, Han-Soo (Dept. of Conservative Dentistry, The Institute of Oral Health Science, Samsung Medical Center) ;
- Yoo, Hyeon-Mee (Dept. of Conservative Dentistry, The Institute of Oral Health Science, Samsung Medical Center) ;
- Oh, Tae-Seok (Dept. of Conservative Dentistry, The Institute of Oral Health Science, Samsung Medical Center)
- 발행 : 1998.12.04
초록
The purpose of this study is to explain theoretically the mechanism of the frequency-dependent apex locator which can detect the apex of the root in moist canals with blood or other conductible canal irrigants. The frequency-dependent apex locator is based on measuring the ratio of the two impedances of the two alternating currents with different frequencies. We analyzed the changes of the ratio between the two impedances by using differential calculus. Our analysis shows that : 1. When the file is in the moist canal, the ratio between the two impedances is almost constant. 2. As the file approaches the apex of the root, the ratio decreases sharply. By this mechanism, the frequency-dependent apex locator can detect the apex of the-root quite accurately in moist canals.