American Journal of Orthodontics and Dentofacial Orthopedics
Original articleAssessing the American Board of Orthodontics objective grading system: Digital vs plaster dental casts
Section snippets
Material and methods
Thirty posttreatment plaster dental casts were selected from the University of Illinois at Chicago Department of Orthodontics. The dental casts were obtained from patients who had nonsurgical comprehensive orthodontic treatment with fixed appliances. The dental casts had to be in acceptable condition with all incisors, canines, at least 1 premolar, and the first and second molars bilaterally in both the maxillary and mandibular arches. No duplicates of dental casts were selected, and there was
Results
For intraexaminer reliability, the Wilcoxon test for paired samples showed no statistical differences for the plaster models (Table II) and the digital models (Table III). The mean differences for each variable and total score involving measurements taken at 2 separate times are shown for both the plaster and the digital models. The mean differences for each criterion and the total score were no greater than 0.05 points deducted for both plaster and digital model measurements.
With regard to
Discussion
When we compared the plaster and digital models, we found statistically significant differences for occlusal contacts, occlusal relationships, and total score. A major problem was encountered throughout the study that explains the differences for occlusal contacts and total score. When we performed the occlusal-contact measurements, the digital images of the maxillary and mandibular teeth overlapped each other. The result was an occlusal-contact measurement that measured the amount of vertical
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Comparison of measurements made on digital and plaster models
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