Measurement Instruments
The ABO has three (3) measurement instruments for the examinee to use in evaluation
of the cases that are presented to the Board. The three measurement instruments are
completed for each case report and are submitted electronically.
- The Discrepancy Index (DI) is a measure of the complexity of an
orthodontic case on the pre-treatment dental casts. It is used by the Board in
determining the criteria for case presentations. For an overview see Discrepancy
Index Scoring System (pdf).
- The Cast/Radiograph Evaluation (C-R Eval) is a measure of the results of
treatment on the final dental casts and intraoral radiographs. For an instructional
manual of the grading system for Cast Evaluation, see
Grading System for Dental Casts and Panoramic Radiographs (pdf).
- The Case Management Form (CMF) is a measure of the changes in the
skeletal, dental and facial aspects of the case.
See
Construction
of the Mandibular Plane 
for completing measurements in the DI and CMF.
For your convenience, the ABO has available for purchase a Calibration Kit. The
ABO highly recommends the use of its Calibration Kit to assist you in making a
qualitative assessment of the records that you plan to use for the clinical
exam. This kit contains three sets of pre-measured casts with scoring keys, the
grading system instructional manual, and a measuring gauge. The Directors will be
using the same grading system contained in this kit to evaluate your treatment
results. The Calibration Kit can be found at the eStore.
The following worksheets are for print use only. For electronic forms submission requirement, use ABO Case Report Work File (pdf) at
Clinical Forms and Instructions