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Clinical accuracy of a new apex locator with an automatic compensation circuit

Authors
 Seung Jong Lee  ;  Ki Chang Nam  ;  Young Joo Kim  ;  Deok Won Kim 
Citation
 JOURNAL OF ENDODONTICS, Vol.28(10) : 706-709, 2002 
Journal Title
JOURNAL OF ENDODONTICS
ISSN
 0099-2399 
Issue Date
2002
MeSH
Adult ; Dental Cementum/anatomy & histology ; Dentin/anatomy & histology ; Electric Impedance ; Electrolytes/chemistry ; Electronics/instrumentation ; Equipment Design ; Glass Ionomer Cements/chemistry ; Humans ; Hydrogen Peroxide/chemistry ; Materials Testing ; Microscopy ; Middle Aged ; Observer Variation ; Odontometry/instrumentation ; Root Canal Preparation/instrumentation* ; Sodium Chloride/chemistry ; Sodium Hypochlorite/chemistry ; Statistics as Topic ; Tooth Apex/anatomy & histology* ; Tooth, Nonvital/pathology
Abstract
A new circuit was designed to automatically compensate for measurement errors of an electronic apex locator in various electrolytes. Thirty-one root canals were clinically tested for accuracy. A file was inserted into the canal until the apex signal was obtained, at which point the file was immobilized with glass-ionomer cement. After extraction, the apical area was exposed and the position of the file tip was examined under an operating microscope. Distances from the major foramen and cemento dentinal junction (CDJ) were recorded. The average distance from the major foramen was −0.13 mm with a range of −1.28 mm and +0.46 mm. The average distance in 26 detectable CDJ samples was +0.18 mm with a range of −0.98 mm and +0.65 mm. The measurements, which were within ±0.5 mm, were 94% (29/31) from the major foramen and 92% (24/26) from the CDJ. Measurement consistencies within one SD were 81% for the major foramen and 65% for the CDJ, respectively. Measurements within two SD were 97% for the major foramen and 92% for the CDJ. There were no differences between the smaller (<#25) and larger apical foramens (≥#25) or vital and nonvital pulps.
Full Text
http://www.sciencedirect.com/science/article/pii/S0099239905604621
DOI
10.1097/00004770-200210000-00007
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/22282913/144616
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