title: A novel method for prediction of dynamic smiling expressions after orthodontic treatment: a case report.
abstract: Smile esthetics has become increasingly important for orthodontic patients, thus prediction of post-treatment smile is necessary for a perfect treatment plan. In this study, with a combination of three-dimensional craniofacial data from the cone beam computed tomography and color-encoded structured light system, a novel method for smile prediction was proposed based on facial expression transfer, in which dynamic facial expression was interpreted as a matrix of facial depth changes. Data extracted from the pre-treatment smile expression record were applied to the post-treatment static model to realize expression transfer. Therefore smile esthetics of the patient after treatment could be evaluated in pre-treatment planning procedure. The positive and negative mean values of error for prediction accuracy were 0.9 and - 1.1 mm respectively, with the standard deviation of ± 1.5 mm, which is clinically acceptable. Further studies would be conducted to reduce the prediction error from both the static and dynamic sides as well as to explore automatically combined prediction from the two sides.
authors: a Department of Orthodontics , Peking University School and Hospital of Stomatology , 100081 Beijing , P.R. China.
authors: Fanfan
authors: F
authors: Dai
authors: b Center for BioMed-X Research, Academy for Advanced Interdisciplinary Studies, Peking University , 100871 Beijing , P.R. China.
authors: Yangjing
authors: Y
authors: Li
authors: a Department of Orthodontics , Peking University School and Hospital of Stomatology , 100081 Beijing , P.R. China.
authors: Gui
authors: G
authors: Chen
authors: a Department of Orthodontics , Peking University School and Hospital of Stomatology , 100081 Beijing , P.R. China.
authors: Si
authors: S
authors: Chen
authors: a Department of Orthodontics , Peking University School and Hospital of Stomatology , 100081 Beijing , P.R. China.
authors: Tianmin
authors: T
authors: Xu
mesh_terms: D000328:Adult; D054893:Cone-Beam Computed Tomography; D004955:Esthetics, Dental / Q000523:psychology; D005145:Face / Q000502:physiology; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008962:Models, Theoretical; D009971:Orthodontics, Corrective; D012904:Smiling
keywords: cone beam computed tomography; expression transfer; orthodontic treatment; smile prediction; structured light system