title: Three dimensional shape measurement system for residual ridges.
abstract: It is very important for design and construction of complete dentures to evaluate the condition of residual ridges of edentulous patients objectively and precisely. The authors have been developing a shape measurement system for residual ridges. In this study, the outline of the system is described and the accuracy of the system is evaluated. The system consists of a high precision laser displacement meter, a working table and its controller, and a personal computer. The working table, on which a plaster model is placed, can move until the end of the moving range at a speed of 0.7 mm/sec. The height of the plaster model was measured intermittently with a frequency of 7 points/sec. To determine the accuracy of this system, experimental plaster models, which simulated the simplified shape of residual ridge, were measured and analyzed. The measurement error was 2.5%, which seemed to be highly accurate. The accuracy of the measurement decreased with the darkness of the color of the plaster model.
authors.affiliation: Second Department of Prosthetic Dentistry, Osaka University Faculty of Dentistry, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Morimitsu
authors.forename: T
authors.initials: T
authors.lastname: Nokubi
authors.forename: T
authors.initials: T
authors.lastname: Ono
authors.forename: K
authors.initials: K
authors.lastname: Watanabe
authors.forename: M
authors.initials: M
authors.lastname: Kibi
authors.forename: Y
authors.initials: Y
authors.lastname: Okuno
mesh_terms: D016301:Alveolar Bone Loss / Q000175:diagnosis* / Q000473:pathology; D000539:Alveolar Process / Q000473:pathology; D003936:Diagnosis, Computer-Assisted / Q000295:instrumentation; D003945:Diagnosis, Oral / Q000295:instrumentation*; D006801:Humans; D007575:Jaw, Edentulous / Q000473:pathology*; D007834:Lasers; D015203:Reproducibility of Results