A three-dimensional dental image construction method comprises the following steps: first, using a probe to obtain point cloud data of tongue side and cheek side of a plurality of teeth respectively, as well as the corresponding X, Y and Z-axis rotation index values then using an image processing device to superimpose the point cloud data of plural teeth according to the rotation index values for forming a three-dimensional clinical tooth image after screening the vertices of said three-dimensional clinical tooth image, performing polynomial fitting calculations to obtain a preliminary dental arch curve generating a plurality of true subsets on the basis of the preliminary dental arch curve, and defining a fitting reference point for each true subset, then obtaining a clinical dental arch curve on the basis of these fitting reference points finally, calculating the offset data between the clinical dental arch curve and a standard dental arch curve, so that a correction on the three-dimensional clinical tooth image can be made according to the offset data.一種牙體立體影像建立方法,先利用一探頭分別取得複數牙齒的舌側面與頰側面的點雲資料與對應的X、Y與Z軸旋轉索引值;接著由一影像處理裝置根據旋轉索引值疊合複數牙齒的點雲資料後形成臨床牙體立體影像;篩選該臨床牙體立體影像的頂點後進行多項式擬合計算以取得一初步牙弓曲線;根據該初步牙弓曲線產生複數真子集,並於每組真子集中定義出一擬合參照點,接著根據該些擬合參照點得到一臨床牙弓曲線;最後計算該臨床牙弓曲線與一標準牙弓曲線的偏移資料,以利用該偏移資料對該臨床牙體立體影像進行校正。
