Journal of Periodontal and Implant Science
- 제23권1호
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- Pages.159-169
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- 1993
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- 2093-2278(pISSN)
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- 2093-2286(eISSN)
하악 제2대구치 치근의 형태학적 구조 및 표면적에 관한 연구
A STUDY OF THE ROOT SURFACE AREA, ANATOMIC STRUCTURE AND LINEAR VARIATION OF THE ROOT SURFACE AREA OF THE MANDIBULAR SECOND MOLAR
- Chung, Hyung-Geun (Dept. of Periodontology, College of Dentistry, Kyung Hee University) ;
- Kwon, Young-Hyuk (Dept. of Periodontology, College of Dentistry, Kyung Hee University) ;
- Lee, Man-Sup (Dept. of Periodontology, College of Dentistry, Kyung Hee University)
- 발행 : 1993.04.30
초록
The thirty six mandibular second molars, which were extracted because of hopeless tooth due to advanced periodontal disease, were measured the length of mesial and distal root and the distance from cementoenamel junction to root separation. The molars were cross-sectioned every 1.5 milimeter from cementoenamel junction to root apex perpendicular to long axis and each section was photographed, projected and measured with a calibrated Digital Curvi-Meter(Com Curvi-8. Japan). The root surface area (RSA), percentage of the RSA and the linear variation of the RSA were calibrated for each 1. 5 mm section. The results were as follows. 1. The mean length of the roots was 12. 98mm for mesial root, 11.84 mm for distal root. The mesial root was longer than distal root.(p<0.01) 2. The mean distance from the cementoenamel junction to the point at which the root separate from the root trunk was 3.82mm for the buccal furcation and 4.75mm for lingual furcation. The buccal root separation was coronal than the lingual root separation.(p<0.01) 3. The total root surface area was
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