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Development of a frequency-dependent-type apex locator with automatic compensation

Authors
 Kim DW  ;  Nam KC  ;  Lee SJ 
Citation
 Critical Reviews in Biomedical Engineering, Vol.28(3~4) : 473-479, 2000 
Journal Title
 Critical Reviews in Biomedical Engineering 
ISSN
 0278-940X 
Issue Date
2000
MeSH
Analysis of Variance ; Electric Impedance ; Electrolytes ; Humans ; Odontometry/instrumentation ; Root Canal Irrigants ; Root Canal Preparation/instrumentation* ; Therapeutic Irrigation ; Tooth Apex/anatomy & histology*
Abstract
Among apex locators, the frequency dependent type is more accurate and convenient to use than others. However, the accuracy of the apex locator is still influenced by the presence of various electrolytes used in root canal treatments. In this study, we developed a frequency-dependent electronic apex locator minimizing the influence of electrolytes on the measurement of root canal lengths. It was confirmed that the two frequencies of 0.5 and 10 kHz are better than the conventional ones of 0.4 and 8 kHz. The impedance ratio of the two different frequencies represents the position of the file in root canal, and the voltage difference of the two frequencies represents the status of the fluid in the root canal. As a result of compensation using the voltage differences of the two frequencies, the errors decreased significantly on average from +0.54 mm to +0.18 mm in H2O2 solution (p < 0.01), and from -0.33 mm to -0.01 mm in NaOCl solution (p < 0.01) in the tooth model experiments.
Full Text
http://www.dl.begellhouse.com/journals/4b27cbfc562e21b8,657c94ee3fd00c46,5e025323540eddbd.html
DOI
10.1615/CritRevBiomedEng.v28.i34.200
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Medical Engineering (의학공학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Conservative Dentistry (보존과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Deok Won(김덕원)
Lee, Seung Jong(이승종)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/171617
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