目的：应用可视化数字人技术，开发儿童下颌骨生长发育模型，以增强正畸矫正设计的可视化效果，提升 矫正过程的效率和精确度。方法：从已建立的6 岁男童冷冻切片数据集，通过灰度图像阈值结合Photoshop 2020 软件图像处理功能，手动提取数字儿童下颌骨数据集。应用表面建模技术将提取的下颌骨数据集转化为可视化下 颌骨模型，并以STL格式保存。依据儿童正畸患者锥形束CT影像资料，应用Mimics 21.0 软件处理其影像资料， 提取下颌骨模型。结合下颌骨生长发育规律和患儿测量数据开发出下颌骨生长发育模型。在干燥下颌骨标本上进 行直径为10 mm和5 mm圆形及长条形孔洞实验，验证下颌骨生长发育模型的准确性。结果：成功开发出正畸设 计中的下颌骨生长模型。结论：应用可视化数字人技术构建下颌骨生长发育模型，为正畸矫正设计提供新的视角。 关键词 下颌骨模型；正畸设计；正畸矫正预测；儿童

Objective： Using visualized digital human technology， to develop a growth and development model of children's mandibular bone， with the purpose of enhancing the visualization of orthodontic treatment planning， and improving the efficiency and accuracy of the orthodontic process. Methods： From the established frozen section dataset of a 6-year-old boy， a digital mandibular bone dataset of the child was manually extracted by combining grayscale image thresholding and image processing capabilities in Photoshop 2020 software.The extracted mandibular bone dataset was converted into a visualizable mandibular model by using surface modeling technology， and saved in STL format. Based on the cone beam CT imaging data of pediatric orthodontic patients， the Mimics 21.0 software was utilized to process the imaging data and extract the mandibular bone models of the pediatric patients. A mandibular growth and development model was developed by combining the laws of mandibular growth and development with the measurement data of pediatric patients. Additionally， Experiments involving circular holes with diameters of 10 mm and 5 mm， as well as elongated holes， were conducted on dried mandibular specimens to validate the accuracy of the mandibular growth and development model. Results： A mandibular growth model for orthodontic design was successfully developed. Conclusion：The application of visual digital human technology in constructing mandibular growth and development models provides a new perspective for orthodontic treatment planning and design.