A three-dimensional dental arch lamination method comprises the steps of: scanning a tooth body to obtain a first point cloud datum and a second point cloud datum of a three-dimensional datum of the tooth body； calculating a three-dimensional spatial area of a data location of the three-dimensional datum； calculating an initial rotational quantity and an initial displacement of the second point cloud datum to perform rigid body transformation； calculating a plurality of corresponding point pairs corresponding to the first and second point cloud data and filtering at least one outlier point pair of the plurality of corresponding point pairs； and predicting a predictive rotational quantity and a predictive displacement of the second point cloud datum to perform another rigid body transformation and to calculate whether an error value of an overlaying lamination of the first and second point cloud data is less than a threshold value or not, based on the filtered corresponding point pairs of the first and second point cloud data after the outlier points are filtered. Accordingly, a corresponding tooth body model of the tooth body can be produced.一種三維牙弓貼合方法，包含：掃描一牙體，並取得該牙體之一三維資料之一第一點雲資料及一第二點雲資料；計算該三維資料之資料所在的一三維空間範圍；計算該第二點雲資料之一初步旋轉及位移量，以進行一剛體轉換；計算該第一及第二點雲資料相應之複數個對應點對，並過濾複數個對應點對中之至少一離群點對；依據過濾過濾離群點後之第一及第二點雲資料之對應點對，用以預估該第二點雲資料之一預估旋轉及位移量，並進行另一剛體轉換、以及計算該第一點雲資料與該第二點雲資料重疊貼合之一誤差值是否低於一門檻值，用以取得對應該牙體之一牙體模型。
