Nickel-Titanium file과 Stainless steel file을 이용한 근관형성시 컴퓨터 단층촬영사진상의 근관형태 변화에 관한 연구
A STUDY ON THE ROOT CANAL MORPHOLOGY CHANGE BY NICKEL-TITANIUM AND STAINLESS STEEL FILE INSTRUMENTATION USING COMPUTERIZED TOMOGRAPHY
소속 상세정보
1소문섭/1Mun Seop So
1임미경/1이수종/2이건일/3이용근/1Mi Kyung Im/1Su Jong Lee/2Keon Il Lee/3Yong Keun Lee
KMID : 0362319970220020659
Abstract
The goals of root canal instrumentation are complete debridement of pulp tissue,
removal of microbes and affected dentin, and proper cleaning and shaping of the root
canal space before obturation. Instrumentation with stainless steel files has been shown
to produce undesirable results in canals, regardless of the improved technique or
modified file type used. Nickel-Titanium(Ni-Ti) alloy has been shown to be
exceptionally elastic, having a lower bending moment and lower permanent set after
torsion, compared with similar gauge stainless steel.
The purpose of this study was to evaluate the change of root canal prepared by
Ni-Ti rotary and stainless steel instruments. thirty-four single rooted teeth of similar
shape and canal size were divided into three groups. The teeth were scanned by
computed tomography before instrumentation. In group 1, canals were instrumented
using a step-back technique with K-file. In group 2, canals were prepared with K-flex
file using the same technique as group 1. Group 3 was prepared with
nickel-titanium(Ni-Ti) rotary instrument using a manufacture's instruction. Instrumented
teeth were again scanned using computed tomography, and reformated images of the
uninstrumented canals were compared with images of the instrumented canals.
K-flex file and Ni-Ti file caused significantly less canal transportation than K-file in
the 8mm root canal section from the apex(p<0.05). K-flex file and Ni-Ti file produced
more centered canal preparation than K-file in the 2mm section(p<0.05). Ni-Ti file
maintained more precisely the center of the canal than K-flex file in the 10mm
section(p<0.05). There was no difference in the removed volume of canals among each
groups.
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