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韓國人 下顎第三大臼齒 發育에 關한 X-線學的 硏究

Roentgenographic Studies on the Development of Mandibular Permanent third Molars in Korean

최신의학 1968년 11권 11호 p.73 ~ 77
명동성,
소속 상세정보
명동성 (  ) - 서울대학교 대학원 치의학과 구강외과

Abstract


The author obtained the following. results through the studies on 1,228 roentgenographs of lower bilateral third molar regions of Korean youth;
1. The rate of :presence, of lower third molars was 75.3 per cent.
2. The period that crowns of mandibular third molars become completed was 17.0 years.
3. The period that roots of mandibular third molars become full length, was .22..1 years.
4. The period that apical closure of mandibular third molars become completed was over 26 years.

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