CONSIDERATIONS ON ECTOPIC ERUPTION OF MAXILLARY 1ST. MOLAR OF CHILDREN IN KOREA.

한국인(韓國人) 아동(兒童)에 있어서 상악제1대구치(上顎第一大臼齒)의 위치부정맹출(位置不正萌出)에 관(關)한 고찰(考察)

  • Min, Shin-Hong (Dept. of Pedodontics, Graduate School, Seoul National University)
  • 민신홍 (서울대학교 대학원 치의학과 소아치과학)
  • Published : 1978.01.01

Abstract

The author has observed the ectopic eruption pattern on oblique cephalogram of 195 children. (5years: 78, 6 years: 58, 7 years: 59). The results were as follows; 1) Making a comparison between hold type and jump type of ectopic eruption, there are 4 cases in Hold type, 5 cases in jump type. 2) Making a comparison of ectopic eruptin between male and female, there are 7 cases in male, 2 cases in female. 3) Making a comparison of ectopic eruption between right side and left side, there are 5 cases at right side, 4 cases at left side. 4) Making a comparison of ectopic eruption among 5 years to 7 years, there are 4 cases in 5 years, 3 cases in 6 years, 2 cases in 7 years. 5) The prevalence of ectopic eruption of the maxillary first molar was 4.61%. 6) Normal eruption angle of the maxillary first molar is prevailing in $80^{\circ}{\sim}85^{\circ}$.

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