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利用空間座標數值散佈圖分析比較牙齒的標準尺寸數值與實際牙齒標本的尺寸數值

Analysis and Comparison of Teeth Measurement Data of Standard Teeth and Extracted Teeth with scatter-diagrams of Spacial Coordinates

摘要


在牙體形態學方面的討論,尺寸數值扮演非常重要的角色。本研究採用牙齒在尺寸上的三種數值:長度、近遠心徑(MD)、頰舌徑(BL),把這些尺寸數值轉換為空間座標值,再利用座標投影觀察它們的座標分佈;在觀察與選擇座標點之後進行方程式計算,再將座標值輸回方程式而進行方程式的變異數的驗證。結果判定它們的座標空間分佈屬於球面方程式,牙冠、牙根、牙齒的平均半徑分別為13.86mm、14.41mm、81.72mm,並且藉由牙齒標本的實際尺寸測量數值的輸入、以及比較標準臨床兩者的差異之後也應證這個發現。要瞭解牙齒在尺寸數值上特有的數學特徵,可使用空間座標數值散佈圖分析牙齒的標準尺寸數值與實際牙齒標本的尺寸數值。

並列摘要


Teeth measurement data are an important part of understanding tooth morphology. This research transformed the length, mesiodistal, and faciolingual measurement data to spacial coordinates. With the help of orthogonal projections, the distribution of the scatter-coordinates could be calculated and estimated with a plane-equation and a sphere-equation. With the help of variance, the equation of standard teeth measurement data should be a sphere-equation not a plane-equation. The sphere-equation-radii of the crown, root, and tooth were 13.86, 14.41, and 81.72mm, respectively. The analysis of measurement data of extracted teeth also supported these results. To understand the mathematical features of teeth measurement data of standard teeth and extracted teeth, they can be analyzed with scatter-diagrams using spacial coordinates.

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