Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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AN EXPERIMENTAL STUDY OF THE EFFECT OF THE EDTA ON HUMAN DENTIN HARDNESS

EDTA가 상아질의 경도 변화에 미치는 영향에 관한 실험적 연구

  • Lee, Sang-Ki (Dept. of Conservative Dentistry, College of Dentistry, Yonsei University) ;
  • Lee, Chung-Suck (Dept. of Conservative Dentistry, College of Dentistry, Yonsei University) ;
  • Park, Dong-Soo (Dept. of Conservative Dentistry, College of Dentistry, Yonsei University) ;
  • Lee, Seung-Jong (Dept. of Conservative Dentistry, College of Dentistry, Yonsei University) ;
  • Lee, Chan-Young (Dept. of Conservative Dentistry, College of Dentistry, Yonsei University)
  • 이상기 (연세대학교 치과대학 보존학 교실) ;
  • 이정석 (연세대학교 치과대학 보존학 교실) ;
  • 박동수 (연세대학교 치과대학 보존학 교실) ;
  • 이승종 (연세대학교 치과대학 보존학 교실) ;
  • 이찬영 (연세대학교 치과대학 보존학 교실)
  • Published : 1990.10.25
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Abstract

The primary purpose of this study was to assess the effect of the EDTA on human dentin hardness of root. The 30 extracted human anterior teeth were divided into three groups, and EDTA was applied on the each tooth root dentin surface for 5, 15 and 30 minutes to evaluate the dentin hardness. The following results were obtained : 1. The KHN of dentin was decreased by 21.3% from 50.8 to 40.0 in 5 min. group, 44.2% from 48.4 to 27.0 in 15 min. group, and 51.9% from 48.0 to 23.1 in 30 min group. 2. The decrease rate per 1 min. of KHN of dentin was 4.3 in 5 min. group, 2.9 in 15 min. group, and 1.7 in 30 min. group. 3. As time passed, the KHN of dentin of 5 min. group and 15 mim. group were significantly decreased, but the KHN of dentin of 30 min. was not significantly decreased compared with 15 min. group. There was a statistical significance in the decrease rate of KHN of dentin among 3 groups(P<0.05).

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