关键词: CT数据, 三维数字化模型, 牙尖交错牙合, 正畸

Abstract:

Objective　To establish digitized dental model with the root based on the three-dimensional laser scanning of plaster dental models and the head CT data, and record the morphological structure of the teeth and the spatial location changes of the teeth during treatment course.　Method　The independent digital models with upper and lower dentition were established based on an adult female's head CT data in Mimics11.0.”. The plaster dental models were scanned with a 3D laser scanner and the data files were merged and saved as point clouds which contained spatial location coordinates of the crown surface and the relationship of the upper and lower dentition in the intercuspal occlusion (ICO).Based on the models from the point clouds, a dentition model with teeth roots was regrouped with independent teeth models built from CT data, and the real spatial position relationship of the upper and lower dentition was rebuilt.　Result　Upper and lower 3D digital full structure dentition models were rebuilt containing details of the anatomical structures of the crowns and roots of teeth, and the relative position of the dentition and occlusion were recovered.　Conclusion　In the orthodontic treatment, the dentitions models with roots from the CT data and 3D scanning can display the change of teeth crowns and roots, and the practitioners can easily evaluate the treatment process and the therapeutic effecacy.

Key words: CT data, Three digital model, Intercuspal occlusion, Orthodontics