| 1708 Accuracy of 3-D Digital Imaging System for the Human Face | ||
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K. KIMOTO, Kanagawa Dental College, Japan, N. GARRETT, University of California Los Angeles, VA Greater Los Angeles Healthcare System, USA, B. WU, University of California - Los Angeles, USA, and M. TOYODA, Kanagawa Dental College, Yokosuka, Japan Objective: Three-dimensional measurement of facial form would greatly assist quantification of aberrations in facial morphology, development of treatment plans and evaluation of treatment outcomes resulting from prosthodontic rehabilitation and craniofacial surgery. Recently, a 3-D imaging system (Venus 3D Precision Imaging System, 3D Metrics), which utilizes a specialized single camera imager, strobe and software, was developed to produce a 3-D model of the face. Methods: The aim of this study is to investigate the accuracy and reliability of this new system for both a standardized model and human subjects. For accuracy estimates, a calibrated line was attached to an artificial model and measured for linear and curvilinear distances of 1, 3, 5, 10, 20, 30, and 50 mm. A distance of 1mm was measured in the center of the field and 20, 40, 60 mm from the center of the image to evaluate distortion. Each measured value was compared with the calibrated distance. Repeated measures of the distance between right and left Endocanthion (en), and right Endocanthion(en) and Subnasale(sn) were made for 10 adult subjects at three consecutive sittings, each two weeks apart, for reliability estimates. All experimental values were measured by two investigators. Results: Error values for calibrated distances ranged from 0.07mm to 0.26mm for linear measures, 0.08mm to 0.34 mm for curvilinear measures and 0.06mm to 0.12mm for distortion from the center. Intra-examiner reliability (r) ranged from 0.92 to 1 and inter-examiner reliability ranged from 0.94 to 1. It was possible to download facial profile data to a rapid prototyping machine for facial modeling, although these models are limited to mid-face structures. Conclusions: The results suggest that for mid-face structures, the imaging system is capable of providing accurate and replicable 3-D facial measurements and may be applicable to evaluation of facial changes due to prosthetic restoration. | ||
| Seq #197 - Masticatory Performance and Oral Function 10:15 AM-11:30 AM, Friday, 12 March 2004 Hawaii Convention Center Exhibit Hall 1-2 | ||
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