하악 제1 대구치 근단부의 형태학적 연구
MORPHOLOGY OF THE APICAL ROOT CANAL SYSTEM IN KOREAN MANDIBULAR FIRST MOLAR
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초록
본 연구는 한국인의 하악 제1 대구치 60개를 대상으로 생리적 근단공의 크기와 형태, 근심 치근의 치근단 3mm에서 isthmus의 발생 빈도와 형태, 그리고 원심 치근의 치근단 3mm의 근관 형태를 입체현미경하에서 60배로 조사한 결과 다음과 같은 결론을 얻었다. 1. 근심 치근은 두 개의 근단공을 가지는 비율이 높았으며(61.67%), 원심 치근은 하나의 근단공을 가지는 비율이 높았다(71.66%). 2. 부근단공의 빈도는 근심 치근의 1개의 근단공을 가지는 경우가 가장 높았다(26.07%). 3. 생리적 근단공의 크기는 근심 치근에서 하나의 근단공을 가지는 경우 0.329mm, 근심 협측 근단공은 0.266mm, 근심 설측 근단공은 0.246mm였으며, 원심 치근에서 하나의 근단공을 가지는 경우 0.375mm, 원심 협측 근단공은 0.291mm, 원심 설측 근단공은 0.237mm로 나타났다. 4. 근단공의 형태는 oval 형태(69.93%)가 가장 많았다. 5. 근심 치근의 치근단 3mm에서 isthmus의 발생빈도는 55%였으며, partial isthmus는 31.66%, complete isthmus는 23.34%로 나타났다. 6. 원심 치근의 치근단 3mm의 근관 형태는 oval 형태(50.64%)가 가장 많았다. 이상의 연구 결과 하악 제1 대구치의 성공적인 근관 치료를 위해서는 생리적 근단공의 실제 크기와 형태 및 isthmus의 존재에 대한 사전 지식이 필요할 것이다.
Abstract
The aim of this study was to investigate the shapes and diameters of the physiological foramen and anatomy of the root canal at 3mm from apex in mandibular first molars. Sixty mandibular first molars were randomly selected. The apical anatomy of 60 mandibular first molars was investigated by means of a stereomicroscope (60x magnification). The results were as follows; 1. There was a high percentage of two physiological foramina in mesial (61.67%) and one foramen in distal(71.66%) roots of mandibular first molars. 2.There was a high frequency of accessory foramina in mesial roots with one foramen (26.07%). 3. The diameters of physiological foramen was as follows: ∙0.329mm in single mesial foramen ∙0.266mm in mesiobuccal foramen and 0.246mm in mesiolingual foramen ∙0.375mm in single distal foramen ∙0.291mm in distobuccal foramen and 0.237mm in distolingual foramen 4. The most common physiological foramen shape was oval (69.93%). 5. The incidence of isthmus in mesial root at 3mm from apex was 55%. The 3mm-sections contained a complete isthmus 31.66% and a partial isthmus 23.34%. 6. 3mm from the apex, the most common canal shape was oval (50.64%). Knowledge of the apical anatomy of mandibular first molar would be necessary for success of surgical and nonsurgical endodontic treatment.
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