口内数码摄影辅助构建三维彩色数字牙列模型

Constructing 3-dimensional colorized digital dental model assisted by digital photography

目的:探索一种构建通用三维彩色数字牙列模型的方法,获得可在常见三维软件中显示和编辑处理的三维彩色数字牙列模型,提高牙列模型在通用三维软件中的仿真效果。方法:使用口内扫描仪扫描牙列获得数字化三维牙列模型,并以STL格式导出,同时用单镜头反光数码相机按照美国牙科美容协会病例摄影要求拍摄口内照片,选择其中5张照片。在Geomagic Studio 2013软件中导入三维牙列数据,并将5张口内照片分别投影至数字化三维牙列模型表面,精细调整不同照片的交界区域使其过渡自然,获得带有颜色信息的三维牙列模型,以OBJ格式或WRP格式(Geomagic软件专用格式)保存和导出。以患者评价为标准对三维数字模型的颜色仿真效果进行评价。结果:基于口内扫描和口内数码照片,构建了可在常见三维软件中显示和编辑的通用三维彩色数字牙列模型,获得较好的牙列颜色仿真效果。在临床上,将此三维彩色牙列模型与面部三维扫描图像配准和复合后用于前牙美学修复的数字化术前设计和修复效果虚拟预测中,提高了医患交流的效率及患者对修复效果的认知程度。结论:结合口内扫描和口内数码摄影可构建出颜色仿真效果良好的通用三维彩色数字牙列模型,在临床应用中可提高三维数字牙列模型的仿真效果,加强医患沟通效率和效果。

Objective： To explore a method of constructing universal 3-dimensional （3D） colorized digital dental model which can be displayed and edited in common 3D software （such as Geomagic se- ties） , in order to improve the visual effect of digital dental model in 3D software. Methods： The mor- phological data of teeth and gingivae were obtained by intra-oral scanning system （3 Shape TRIOS） , con- structing 3D digital dental models. The 3D digital dental models were exported as STL files. Meanwhile, referring to the accredited photography guide of American Academy of Cosmetic Dentistry （ AACD）, five selected digital photographs of patients＇ teeth and gingivae were taken by digital single lens reflex camera （DSLR） with the same exposure parameters （except occlusal views） to capture the color data. In Geomagic Studio 2013, after STL file of 3D digital dental model being imported, digital photographs were projected on 3D digital dental model with corresponding position and angle. The junctions of different photos were carefully trimmed to get continuous and natural color transitions. Then the 3D eolorized digital dental model was constructed, which was exported as OBJ file or WRP file which was a special file for software of Geomagic series. For the purpose of evaluating the visual effect of the 3D colorized digital model, a rating scale on color simulation effect in views of patients＇ evaluation was used. Sixteen patients were recruited and their scores on colored and non-colored digital dental models were recorded. The data were analyzed using McNemar-Bowker test in SPSS 20. model with better color simulation was constructed based Results：Universal 3D colorized digital dental on intra-oral scanning and digital photography.For clinical application, the 3D colorized digital dental models, combined with 3D face images, were in- troduced into 3D smile design of aesthetic rehabilitation, which could improve the patients＇ cognition for the esthetic digital design and virtual prosthetic effect. Conclusion： Universal 3D colorized digital dental model with better color simulation can be constructed assisted by 3D dental scanning system and digital photography. In clinical practice, the communication between dentist and patients could be improved as- sisted by the better visual perception since the colorized 3 D digital dental models with better color simula- tion effect.