Lecture Description
The aim of orthodontic treatment is to establish a harmonious occlusion of the maxillary and mandibular teeth along with the proper jaw relationship. If the sagittal position of the maxilla and mandible is severely displaced, orthognathic surgery is necessary, but if the amount of discrepancy is not large, good occlusion and facial esthetics can be achieved through orthodontic camouflage treatment. Especially, it is fortunate that this kind of camouflage treatment has been more possible and successful since we used skeletal anchorage in orthodontic field. And it is important to form a good occlusion at the crown level, but also at the root level, which is important in securing long-term stability from a physiological, periodontal, and biomechanical viewpoint. Dental cone beam CT is capable of three-dimensionally evaluating the spatial relationship between the apical root and the surrounding cortical bones. This is more accurate and visual than evaluation through the past panoramic X-rays or 2D lateral cephalometric radiograph. In addition, it is possible to predict and recognize the risk factors of root resorption or alveolar bone damage in advance through the evaluation of cortical bone proximity to apical roots, and it is possible to visually confirm the results of the bone remodeling process of the surrounding alveolar bone before and after treatment. In this presentation, the method of evaluating the spatial position of the anterior teeth on dental cone beam CT before treatment will be reviewed and the evaluation of the root position in the sagittal and axial plane before and after treatment is discussed through clinical cases. In addition, the method of setting a more analytical and detailed goal-oriented treatment planning for the target position of the anterior crown and root based on cone beam CT from the initial treatment planning stage will be discussed.
