Objectives: The aim of this study was to establish a novel method for the measurement of tooth movement with one CBCT scan and pre- and post-treatment casts model.
Method: This system mainly consists of 6 procedures: (1) reconstruction of the virtual skull from the pre-treatment scanning of the patient with CBCT; (2) reconstruction of virtual dentition data from the scanning of pre- and post-treatment casts models with CBCT; (3) superimposition of the virtual skull and the pre-virtual dentition to create the tooth including the root as the complete tooth by a least square method. In this superimposition, the reference points were set in TAD and TPA; (4) superimposition of the pre-dentition and the complete tooth, post-dentition and the complete tooth, respectively. The reference points were set in the shape of crown; (5) superimposition of the pre- and post-dentition. The reference point were set in TAD and palatal soft tissues; (6) measurement of the surface area of the root and the amount of resorption in the alveolar bone using the pre- and post-tooth data. In addition, the orthodontic force was measured with the orthodontic force measurement model that re-created the oral cavity of the patient. And, the orthodontic force per root surface area was calculated.
Results: Through this system, the measurement of the orthodontic force per root surface area and the amount of resorption in the alveolar bone were possible.
Conclusion: In this study, 3-dimensional visualization of the tooth movement including the root was possible from one CBCT scan.