title: Direct 3-D morphological measurements of silicone rubber impression using micro-focus X-ray CT.
abstract: Three-dimensional computer models of dental arches play a significant role in prosthetic dentistry. The microfocus X-ray CT scanner has the advantage of capturing precise 3D shapes of deep fossa, and we propose a new method of measuring the three-dimensional morphology of a dental impression directly, which will eliminate the conversion process to dental casts. Measurement precision and accuracy were evaluated using a standard gage comprised of steel balls which simulate the dental arch. Measurement accuracy, standard deviation of distance distribution of superimposed models, was determined as +/-0.050 mm in comparison with a CAD model. Impressions and casts of an actual dental arch were scanned by microfocus X-ray CT and three-dimensional models were compared. The impression model had finer morphology, especially around the cervical margins of teeth. Within the limitations of the current study, direct three-dimensional impression modeling was successfully demonstrated using microfocus X-ray CT.
authors.affiliation: Department of Medical Simulation Engineering, Research Center for Nano Medical Engineering, Institute for Frontier Medical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8507, Japan. kamegawa@shimadzu.co.jp
authors.forename: Masayuki
authors.initials: M
authors.lastname: Kamegawa
authors.forename: Masayuki
authors.initials: M
authors.lastname: Nakamura
authors.forename: Yu
authors.initials: Y
authors.lastname: Fukui
authors.forename: Sadami
authors.initials: S
authors.lastname: Tsutsumi
authors.forename: Masaki
authors.initials: M
authors.lastname: Hojo
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D003724:Dental Arch / Q000033:anatomy & histology; D003760:Dental Impression Materials; D003761:Dental Impression Technique; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007574:Jaw Relation Record; D003765:Models, Dental; D011145:Polyvinyls; D012826:Silicone Elastomers; D012833:Siloxanes; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D003760:Dental Impression Materials; D011145:Polyvinyls; D012826:Silicone Elastomers; D012833:Siloxanes; C034183:vinyl polysiloxane