Additional parameter in five characteristics of Ackerman-Proffit Classification?

# Which is added as an additional parameter in five characteristics of Ackerman-Proffit Classification?

A. Curve of Spee

B. Esthetic line of occlusion

C. Smile arc

D. Smile line

The correct answer is B. Esthetic line of occlusion

The Ackerman-Proffit classification evaluates malocclusion using Angle's anteroposterior relationships plus five key characteristics—alignment (perimeter/crowding), transverse relationship (arch width discrepancies), vertical relationship (open/deep bite), overjet (incisor protrusion), and midline deviation (asymmetry)—often visualized via a Venn diagram for comprehensive diagnosis. To enhance esthetic analysis, the esthetic line of occlusion is incorporated as an additional parameter, assessing the curved alignment of the maxillary incisor edges relative to the lower lip during smiling or repose, which helps predict treatment outcomes for facial harmony beyond functional aspects. This addition addresses limitations in purely skeletal classifications by integrating soft-tissue esthetics. Options A (Curve of Spee) relates to occlusal curvature but isn't added here; C (Smile arc) and D (Smile line) are related esthetic features but not specifically the parameter in this system.

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