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Related Experiment Video

Updated: Jul 11, 2026

Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer

Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer

Published on: March 1, 2015

Dynamic smile analysis in young adults.

Christopher Maulik¹, Ravindra Nanda

¹Department of Craniofacial Sciences; Chair, Division of Orthodontics, University of Connecticut School of Dental Medicine, Farmington, CT 06030-1725, USA.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics

|September 11, 2007

Summary

This summary is machine-generated.

This study establishes dynamic smile norms, finding orthodontic treatment may not flatten the smile arc. Rapid maxillary expansion (RME) was associated with a reduced buccal corridor in orthodontically treated patients.

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Area of Science:

Orthodontics
Dentofacial aesthetics
Smile analysis

Background:

Orthodontic trends prioritize smile esthetics, but objective smile norms are lacking.
Few studies provide quantitative averages for smile components.
This research addresses the need for dynamic smile data.

Purpose of the Study:

To establish average values for various smile components.
To compare smile characteristics between orthodontically treated and untreated individuals.
To evaluate the impact of rapid maxillary expansion (RME) on smile parameters.

Main Methods:

Utilized video equipment to record smiles from 230 participants.
Analyzed smile arcs and buccal corridors.
Compared measurements between different patient groups.

Main Results:

Most subjects exhibited a flat smile arc extending to the second maxillary premolar.
A majority had an 11% buccal corridor.
Orthodontically treated subjects showed a significantly more parallel smile arc than untreated subjects.
The rapid maxillary expansion (RME) group demonstrated a statistically significant reduction in buccal corridor compared to non-expanded subjects.

Conclusions:

The study provides dynamic norms for smile esthetics.
Orthodontic treatment may not necessarily flatten the smile arc as previously believed.
Rapid maxillary expansion (RME) appears correlated with a narrower buccal corridor.