title: A cone-beam CT based technique to augment the 3D virtual skull model with a detailed dental surface.
abstract: Cone-beam computed tomography (CBCT) is used for maxillofacial imaging. 3D virtual planning of orthognathic and facial orthomorphic surgery requires detailed visualisation of the interocclusal relationship. This study aimed to introduce and evaluate the use of a double CBCT scan procedure with a modified wax bite wafer to augment the 3D virtual skull model with a detailed dental surface. The impressions of the dental arches and the wax bite wafer were scanned for ten patient separately using a high resolution standardized CBCT scanning protocol. Surface-based rigid registration using ICP (iterative closest points) was used to fit the virtual models on the wax bite wafer. Automatic rigid point-based registration of the wax bite wafer on the patient scan was performed to implement the digital virtual dental arches into the patient's skull model. Probability error histograms showed errors of < or =0.22 mm (25% percentile), < or =0.44 mm (50% percentile) and < or =1.09 mm (90% percentile) for ICP surface matching. The mean registration error for automatic point-based rigid registration was 0.18+/-0.10 mm (range 0.13-0.26 mm). The results show the potential for a double CBCT scan procedure with a modified wax bite wafer to set-up a 3D virtual augmented model of the skull with detailed dental surface.
authors.affiliation: Division of Maxillo-Facial Surgery, Department of Surgery, General Hospital St Jan Bruges, Bruges, Belgium. gwen.swennen@azbrugge.be
authors.forename: G R J
authors.initials: GR
authors.lastname: Swennen
authors.forename: M Y
authors.initials: MY
authors.lastname: Mommaerts
authors.forename: J
authors.initials: J
authors.lastname: Abeloos
authors.forename: C
authors.initials: C
authors.lastname: De Clercq
authors.forename: P
authors.initials: P
authors.lastname: Lamoral
authors.forename: N
authors.initials: N
authors.lastname: Neyt
authors.forename: J
authors.initials: J
authors.lastname: Casselman
authors.forename: F
authors.initials: F
authors.lastname: Schutyser
mesh_terms: D003198:Computer Simulation; D054893:Cone-Beam Computed Tomography; D003724:Dental Arch / Q000000981:diagnostic imaging*; D003761:Dental Impression Technique; D003766:Dental Occlusion; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D007574:Jaw Relation Record; D008953:Models, Anatomic; D003765:Models, Dental; D019647:Oral Surgical Procedures; D010347:Patient Care Planning; D010865:Pilot Projects; D012886:Skull / Q000033:anatomy & histology*; D025321:Surgery, Computer-Assisted; D014584:User-Computer Interface; D014885:Waxes
chemical_list: D014885:Waxes