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The Relationship between Posttreatment Smile Esthetics and the ABO Objective Grading System: Class I Extraction

Vagdevi Hosur Kantharaju¹, Gowdara Shivaprakash², Naveen Shamnur³

¹Specialist Orthodontist, Private Practitioner, Karnataka, India.

Turkish Journal of Orthodontics

|April 8, 2021

Summary

The American Board of Orthodontics (ABO) objective grading system did not correlate with smile esthetics in Class I extraction or non-extraction cases. Incorporating soft tissue variables may improve smile evaluation.

Keywords:

ABO Objective Grading System Q-Sort smile esthetics

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Area of Science:

Orthodontics
Dental Aesthetics
Objective Measurement

Background:

The American Board of Orthodontics (ABO) developed an objective grading system to standardize orthodontic treatment outcomes.
Evaluating smile esthetics is crucial in orthodontic treatment planning and assessment.

Purpose of the Study:

To assess the correlation between the ABO objective grading system components and perceived smile esthetics.
To determine if the ABO grading system can predict smile attractiveness in Class I extraction versus non-extraction cases.

Main Methods:

40 Class I orthodontic patients (20 extraction, 20 non-extraction) aged 13-30 years were analyzed.
Post-treatment dental casts and panoramic radiographs were scored using the ABO grading system.
Smile attractiveness was rated by a panel of 12 orthodontists; statistical analyses (Pearson correlation, logistic regression) were performed.

Main Results:

A weak correlation was observed between ABO grading criteria and smile attractiveness (r values from -0.63 to 0.37).
Neither individual ABO scores nor the total score significantly predicted smile attractiveness in either extraction or non-extraction groups (p>0.05).

Conclusions:

The current ABO objective grading system does not correlate with post-treatment smile esthetics in Class I cases.
The study suggests incorporating soft tissue variables into the ABO grading system for a more comprehensive smile evaluation.