Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
권호 표지

A STUDY OF THE ANATOMY OF MANDIBULAT MOLAR & THE EFFECT OF VARIOUS INSTRUMENTATION ON CORONAL FLARING

하악구치 근심근의 해부학적 형태와 근관확대방법이 Coronal flaring에 미치는 영향에 관한 연구

  • Lee, Se-Jong (Dept. of Conservative Dentistry, College of Dentistry, Won Kwang University) ;
  • An, Byoung-Doo (Dept. of Conservative Dentistry, College of Dentistry, Won Kwang University) ;
  • Choi, Gi-Woon (Dept. of Conservative Dentistry, College of Dentistry, Kyung Hee University) ;
  • Yim, Mi-Keoung (Dept. of Conservative Dentistry, College of Dentistry, Won Kwang University)
  • 이세종 (원광대학교 치과대학 보존학교실) ;
  • 안병두 (원광대학교 치과대학 보존학교실) ;
  • 최기운 (경희대학교 치과대학 보존학교실) ;
  • 임미경 (원광대학교 치과대학 보존학교실)
  • Published : 1991.10.31
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Abstract

A model system was used which enabled the same root canal system to be measured before and after coronal flaring of 51 extracted mandibular molars. The concavity of the distal surface of the mesial root was measured and the amount of reduction was compared after coronal flaring using step-back flared preparation, Gates-Glidden dirll or ultrasonic system(Quick-$\varepsilon$) at the furcation and apical 3mm from the furcation. The results were as follows: 1. The mean concavity of mesial root of manchbular molar was $0.73{\pm}0.27mm$ at the bifurcation and $0.65{\pm}0.23mm$ at the 3.0mm apical from the bifurcation. 2. The thickness of the root canal wall of the mesiobuccal canal was $1.08{\pm}0.26mm$ at the bifurcation and $1.00{\pm}0.23mm$ at the 3.0mm apical from the bifurcation. 3. The thickness of the root canal wall of the mesiolingual was $1.09{\pm}0.21mm$ at the bifurcation and $0.98{\pm}0.29mm$ at the 3.0mm apical from the bifurcation. 4. In the amount of reduction at the furcation and at the 3.0mm apical from the furcation there was no statistically significant difference between the step-back preparation and Gates-Glidden drill preparation, and ultrasonic preparation(P>0.05).

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