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Journal of Dental Research
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An Image Analysis System for the Determination of Tooth Dimensions from Study Casts: Comparison with Manual Measurements of Mesio-distal Diameter

A.H. Brook

Department of Children's Dentistry and Orthodontics

N.B. Pitts

Department of Conservative Dentistry, Faculty of Dentistry, University of Hong Kong, Hong Kong

F. Yau

Department of Children's Dentistry and Orthodontics

P.K. Sandar

Department of Children's Dentistry and Orthodontics

A first comparison of an image analysis method with classical hand measurement was made using the mesio-distal diameter data derived by the simplest image analysis method, the jawview mode. Fifty casts of male Hong Kong Chinese dental students, mean age 20.4 years, were examined by both methods. The two techniques gave comparable overall results, the correlation coefficients generally being greater than 0.9. A combination of the buccal and occlusal image analysis views gave the best correlation with hand measurement with a comparable variability for different tooth types. For certain teeth, particularly posteriors, reproducibility was better using hand measurement. Optimal weighting of the data from these two different image analysis views can give an "estimated hand measurement" value. Further development of the method to deal with differing orientations of teeth is possible.

Journal of Dental Research, Vol. 65, No. 3, 428-431 (1986)
DOI: 10.1177/00220345860650031101
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