Evaluation of a software program for applying the American Board of Orthodontics objective grading system to digital casts.

Introduction: The American Board of Orthodontics' objective grading system (ABO OGS) is currently the gold standard for evaluating plaster casts of completed orthodontic cases.

Methods: Thirty-six cases of finished orthodontic casts in plaster and digital form were scored by using 2 methods: an electronic version of the ABO OGS designed to be used with digital casts (OrthoCAD, Cadent, Fairview, NJ) and the ABO gauge designed to be used with plaster casts. The 2 scoring methods were compared using descriptive analysis (range, absolute mean difference, and standard deviation), the Spearman rank correlation coefficient, and the Wilcoxon rank sum test.