Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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DEVELOPMENT OF NEW FREQUENCY-DEPENDENT TYPE APEX LOCTOR ; VOLTAGE DIFFERENCE COMPENSATING TYPE

주파수의존형 전자근관장측정기의 개발과 정확도에 관한 연구 ; 전압차 자동보정형

  • Lee, Seung-Jong (Department of Conservative Dentistry, College of Dentistry, Yonsei University) ;
  • Kim, Deok-Won (Department of Biomedical Engineering, College of Medicine, Yonsei University) ;
  • Nam, Ki-Chang (Department of Biomedical Engineering, College of Medicine, Yonsei University)
  • 이승종 (연세대학교 치과대학 치과보존학 교실) ;
  • 김덕원 (연세대학교 치과대학 치과보존학 교실) ;
  • 남기창 (연세대학교 치과대학 치과보존학 교실)
  • Published : 1997.09.30
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Abstract

The purpose of this study was to develop an accurate frequency-dependent type apex locator. To compensate the impedence differences of different canal contents, voltage differences were pre-measured and stored for saline, HOsb1/$2O_2$ and NaOCl. The circuit was adjusted to recognize the different voltages of each solution, thereby the machine could automatically compensate the voltage differences. In the process of this study, the following informations were observed. 1. Most stable apical reading was obtained at 500Hz and 10kHz. 2. There were no differences in accuracy among three different frequency types, sign wave, triangular wave and rectangular wave(p>0.05). 3. Before the compensation of voltage differences, saline, H2O2 and NaOCl showed different readings at the apex even with the frequency-type (p<0.05). 4. After compensating the voltage difference, the accuracy was enhanced from + 0.42 to +0.32 in H2O2(p<0.05), from -0.34 to -0.12 in NaOCl(p<0.05).

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Acknowledgement

Supported by : 한국과학재단