title: Personalized tooth shape estimation from radiograph and cast.
abstract: Three-dimensional geometric information of teeth is usually needed in pre- and postoperative diagnoses of orthodontic dentistry. The computerized tomography can provide comprehensive 3-D teeth geometries. However, there is still a discussion on computed tomography (CT) as a routine in orthodontic dentistry due to radiation dose. Moreover, the CT is useless when a dentist needs to extract 3-D structures from old archive files with only radiographs and casts, where patient's teeth changed ever since. In this paper, we propose a reconstruction framework for patient-specific teeth based on an integration of 2-D radiographs and digitized casts. The reconstruction is under a template-fitting framework. The shape and orientation of teeth templates are tuned in accordance with patient's radiographs. Specially, the tooth root morphology is controlled by 2-D contours in radiographs. With ray tracing and a contour plane assumption, 2-D root contours in radiographs are projected back to 3-D space, and guide tooth root deformations. Moreover, the template's crown is deformed nonrigidly to fit digitized casts that bear patient's crown details. The system allows 3-D tooth reconstruction with patient-specific geometric details from just casts and 2-D radiographs.
authors.affiliation: Key Laboratory of Machine Perception (MOE), Department of Machine Intelligence, Peking University, Beijing 100871, China. peiyuru@cis.pku.edu.cn
authors.forename: Yuru
authors.initials: Y
authors.lastname: Pei
authors.forename: Fuhao
authors.initials: F
authors.lastname: Shi
authors.forename: Hua
authors.initials: H
authors.lastname: Chen
authors.forename: Jia
authors.initials: J
authors.lastname: Wei
authors.forename: Hongbin
authors.initials: H
authors.lastname: Zha
authors.forename: Ruoping
authors.initials: R
authors.lastname: Jiang
authors.forename: Tianmin
authors.initials: T
authors.lastname: Xu
mesh_terms: D003198:Computer Simulation; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D003765:Models, Dental; D009970:Orthodontics / Q000379:methods; D014057:Tomography, X-Ray Computed; D014070:Tooth / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*