下顎 第二大臼齒의 萌出過程에 關한 硏究
THE STUDY OF THE ERUPTION PATTERN OF THE MANDIBULAR SECOND PERMANENT MOLAR
소속 상세정보
김무(金茂)/Moo Kim
KMID : 0358919790060010053
Abstract
下顎 第二大臼齒의 萌出過程을 觀察하기 爲하여 6歲부터 13歲까지의 兒童을 對象으로 425
例의 Oblique Cephalogram을 撮影하고 下顎 第二大臼齒의 垂直方向의 變化, 近遠心方向의
變化 및 齒冠軸傾斜 角度를 調査하여 다음과 같은 結論을 얻었다.
1. 下顎 第二大臼齒의 位置變化와 第一大臼齒 後方 齒槽骨緣의 變化速度가 10.0∼10.1歲 或
은 石灰化度 Ⅸ時期를 前後하여 그 樣相이 相異하여졌다.
2. 下顎 第二大臼齒의 萌出方向은 觀察初期에 前上方을 向하고 있었으나 Ⅸ時期 以後 咬合
面方向으로 向한다고 생각되었다.
3. 下顎 第一大臼齒의 遠心端에서 下顎枝까지의 距離가 觀察 初期에는 下顎 策二大臼齒 齒
冠幅徑의 0.9∼1.0倍였으나 觀察 末期에는 1.4倍로까지 擴大되었다.
#초록#
To Study the eruption pattern of the mandibular second permanent molar, the author
took 425 cases of Oblique Cephalogram from 6 to 13 years old children and observed
the vertical and mesiodistal directional change and tooth axis change.
The following results were obtained. :
1. The eruption pattern of the mandibular second permanent molar was changed at
about 10.0∼10.1 ages or calcification stage Ⅸ.
2. At the early stage, the path of eruption of the mandibular second parmanent molar
directed upward and forward and after calcification stage Ⅸ it changed to the direction
of upward.
3. At the early stage, the distance from the distal end of the mandibular first
permanent molar to the anterior portion of the ascending ramus was 0.9∼1.0 times
larger than the mesio-distal diameter of the mandibular second molar, but at the later
stage it was increased 1.4 times larger than the mesio-distal diameter of the mandibular
second permanent molar.
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