乳齒列期 齒列穹 形態에 關한 硏究
A STUDY OF DENTAL ARCB FORM IN THE DECIDUOUS DENTITION
소속 상세정보
김왕근(金旺根)/Kim Wang Keun
김남홍(金南洪)/Kim Nam Hong
KMID : 0358919850120010137
Abstract
結論
本 硏究에는 乳齒列期 齒列穹의 形態가 어느정도 抛物線에 適合한가를 糾明하기 위하여
正常咳合 상태인 3歲에서 5歲까지의 小兒의 硬石膏模型 91개를 대상으로 하였다.
硬石膏模型 위에 투명유리를 부착시켜 計測點을 표시한 다음 tracing 방안지에 옮겨 計測
한 資料를 컴퓨터 (PRIME 750, IBM Co.)에 入力시켜 다음과 같은 結果를 얻었다.
1. 上顎의 齒列穹線은 92% 以上, 下顎刻 齒列穹線은 91% 以上 抛物線式에 撥合하였다.
2. 上顎 中心齒列穹線의 常數 A는 -0.54이고 下顎 中心齒列穹線의 常數 A는 -0.59로서 上
顎 齒列穹이 下顎 齒列穹보다 擴張된 抛物線 形態를 보였다.
3. 咳頭齒列穹線이 中心齒列穹線보다 抛物線式에 더 適合하였다.
4. 齒列穹斜長徑(obligue arch length) 對 齒列穹惰徑(inter molar width)의 比率을 4分位
로 나누고, 각 分位에 해당하는 齒列穹緣의 平均 抛物線式과 그림을 決定하였다.
#초록#
This study was to investigate the fitness of the primary dental arch to the parabola.
The sumples of 91 plaster casts were obtained which were takerl from children with
normal occlusion, aging from 3 to 5 years.
Landmarks on the stone cants were marked on measuring glass which was
superimposed on the stone casts, and transfered and measured to the tracing paper.
The points on the tracing papers were digitized, and scattergrams and statistics were
performed by the computer; PRIME 750, IBM Co., U.S.A..
The results were as follows:
1. The fitness of the primary ental arch to the parabola was above 92% in the upper
dental arch, and was above 91% in the lower dental arch.
2. Constant value A of upper dental arch line passing the midpoints of primary
dentition was -0.54 and that of lower ental arch was -0.59, and the upper dental arch
showed more expended parabola than the lower dental arch.
3. The dental arch line passing the buccal cusp tips of the primary posteriors and the
midpoints of he primary incisors were more fit to the parabola than the dental arch line
passing the midpoints of the primary teeth.
4. The ratio of oblique arch length to intermilar width was divied into 4 groups by
the quaters, and the mean parabolic equations and curves were calculated and drawn.
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