Design and implementation of teeth segmentation in Orthodontic 3D modelling system

摘要

This research explains about segmentation process in Orthodontic 3D Modelling System (Dental.Smile). Dental.Smile is implemented using C# programming language with Windows Presentation Foundation (Wpf) 3D. This system is made for dentist, especially Orthodontics to help tooth analizing. This system started with registration process, then scanning, then manipulation with in segmentation process. Segmentation can be splitted into 2 processes, which is separating tooth with the gum and separating the teeths it self. The process begins with loading the .obj file to the system, and then defining a plane crossing the model in <0,0,0> point. Because of the position of the model isn't linier with the plane, so need to slide manually till the position suitable with the gap between tooth and gum. After that can be segmented separating teeth with the gum. Once we get the tooth model (raw), the next process is define the teeth marker between teeth continuesly. Teeth segmentation will be processed once the teeth markers already marked. The segmentation result will be store in a .obj file with the group structure. Each teeth has a group name and verteks. These groups will be used to manipulate the teeth model for measurements, brace and wiring and teeth movement, etc. Based on implementation and testing result can be conclude that orthodontics 3D modelling system can be implemented. Although the segmentation result not yet exactly perfect with the teeth structure, because there are still user intervention (dentist), but for the next development is possible to be automatic process.