(A) stastical study of tooth size, arch dimension and interincisal angle in normal occlusion

치의학과/석사[한글] 저자는 남녀정상교합자 104명을 대상으로 석고 모형과 두부방사선 규격사진을 이용하여 치아크기와 Arch Dimension, Interincisal Angle을 통계 분석 처리하여 다음과 같은 결론을 얻었다. 1. Over-all Ratio(하악 12치아 합/상악 12치아 합 X 100)는 90.7±2.28% 범위는 85.97-96.21 이며 Anterior Ratio(하악 6전치 합/상악 6전치 합 X 100)는 78.4±3.20% 범위는 77.11-88.96 이었다. 2. Howes씨 분석에서 상악 12치아 합에 대한 Canine Fossa Diameter의 백분율은 42.39±1.25% 이며 Premolar Diameter의 백분율은 42.9±1.08% 이고 Basal Arch Length의 백분율은 31.62±1.20% 이었다. 3. Howes씨 분석에서 하악 12치아 합에 대한 Canine Fossa Diameter의 백분율은 39±0.98% 이며 Premolar Diameter의 백분율은 40.3±0.98% 이고 Basal Arch Length의 백분율은 32.6±1.22% 이었다. 4. 전치부 피개도와 BAL의 비와는 역상관계였으며 Arch Length의 비 및 Anterior Ratio 와는 유의할만한 상관성이 없었다. [영문] Tooth size and arch dimension contribute a great deal to balanced occlusion, facial harmony and esthetics. This information is one of the most important factors in orthodontics to make an adequate diagnosis and tratment plan. The author selected dental casts and cephalometric films of 52 males and 52males with normal occlusion, ranged from 14 to 23 years of age, studied on the tooth size, arch dimension and interincisal angle. The obtained results were as follows: 1. The mean value of the over-all ratio [(sum mand.12)/(sum max.12) X 100]was 90.7±2.28% a range of 85.97-96.2%, and the anterior ratio [(sum mand.6)/(sum max.6) X 100] was 78.4±3.20, a range of 77.11-88.96%. 2. The mean value of the canine fossa diameter, premolar diameter and basal arch length to the sum of the maxillary 12 teeth were 42.39±1.25%, 42.82±1.08% and 31.62±1.20%. 3. The mean value of the canine fossa diameter, premolar diameter and basal arch length to the sum of the mandibular 12 teeth were 39±0.98%, 4.3±0.98 and 32.6±1.22%. 4. Reverse correlation coefficientwas observed between overbite-overjet and basal arch length, but significant correlation was not observed between overbite-overjet and anterior ratio.restrictio