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Soft-tissue changes associated with maxillary incisor retraction

M D Rains, R Nanda

American Journal of Orthodontics

|June 1, 1982

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Lip adaptation to incisor retraction is complex. Mandibular position significantly impacts lip changes, more so than lower incisor movement, influencing both upper and lower lip responses during orthodontic treatment.

Area of Science:

Dentofacial Orthodontics
Cephalometric Analysis
Soft Tissue Dynamics

Background:

The relationship between incisor retraction and perioral soft tissue changes remains debated.
Understanding lip response to orthodontic tooth movement is crucial for predictable treatment outcomes.

Purpose of the Study:

To investigate the adaptive responses of the upper and lower lips to maxillary and mandibular incisor movement.
To identify key factors influencing integumental profile changes during incisor retraction.

Main Methods:

Cephalometric analysis of 30 female patients undergoing incisor retraction.
Stepwise multiple regression analysis to assess correlations between dental, skeletal, and soft tissue changes.

Main Results:

Related Experiment Videos

Lower lip exhibited greater variability in response to upper incisor movement compared to the upper lip.
Mandibular position (pogonion/menton) was a significant predictor for vertical and horizontal lip changes.
Upper lip response was influenced by upper/lower incisor movement and mandibular rotation; lower incisor movement showed no correlation with lip changes.

Conclusions:

Mandibular position is critical for predicting lip adaptation during incisor retraction.
Existing prediction models for lip changes can be improved by incorporating skeletal and soft tissue factors.
The study provides a more nuanced understanding of the complex interplay between dentition, bone, and soft tissues in the perioral area.