Objective Aim of this study was to calculate the space for levelling the curve of Spee in digital models,and compare with the traditional method used in orthodontic practice.

• 目的比较传统模型与三维数字化模型在间隙分析中的差异,并且应用数字化模型来准确计算平整牙弓所需间隙,验证传统模型分析中对平整牙弓所需间隙的方法是否正确。