치아 모델링을 위한 표면 메쉬와 볼륨 데이터의 결합 = Combining Surface Mesh and Volume Data for Teeth Modeling

다국어 초록 (Multilingual Abstract)

Dental computer-aided design (CAD) systems have been intensively introduced to digital dentistry in recent years. As basic digital models, volumetric computed tomography (CT) images or optical surface scan data are used in most dental fields. In many cases including orthodontics, complete teeth models are required for the diagnosis, planning and treatment purposes. We introduce a novel modeling approach combining dental CT images and an optical scanned surface. First, correspondence pairs between two different data are determined based on their spatial relationship. The pairs are used to define the co-segmentation energy by introducing similarity and dissimilarity terms between corresponding pairs. Efficient global optimization can be performed by formulating a graph-cut problem to find the segmentation result that minimizes the energy. After classifying crown and root regions with each set of data, complete individual teeth are obtained by merging the two different data sets. The advancing front method is successfully applied for the merging purpose considering the signed distance from the crown boundary of the surface mesh and the root surface of the CT. The resulting teeth models have detailed geometries obtained from the optical scanned surface and accurate interstice regions recovered from volumetric data. In addition, the suggested merging approach makes it possible to obtain complete teeth models with incomplete CT data with metal artifacts.