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Related Experiment Video

Updated: Mar 29, 2026

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Correlation Between Lip Prominence and Orthodontic Incisor Repositioning Within an Aesthetic Triangle Framework.

Sorana Maria Bucur1, Eugen Silviu Bud2, Mioara Decusară3

  • 1Department of Dentistry, Faculty of Medicine, "Dimitrie Cantemir" University of Târgu Mureș, 3-5 Bodoni Sandor Str., 540545 Târgu Mureș, Romania.

Medicina (Kaunas, Lithuania)
|March 28, 2026
PubMed
Summary

Orthodontic treatment significantly impacts lower lip prominence, with mandibular incisor inclination being a key predictor. The aesthetic triangle framework offers a better way to assess these soft-tissue changes post-treatment.

Keywords:
aesthetic trianglefacial aestheticsincisor inclinationlip prominenceorthodonticsprofile analysissoft tissue response

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Area of Science:

  • Orthodontics
  • Cephalometric analysis
  • Soft tissue morphology

Background:

  • Predicting lip prominence changes in orthodontics is difficult using traditional methods.
  • The aesthetic triangle framework offers a comprehensive approach by integrating nasal and chin morphology.

Purpose of the Study:

  • To evaluate the efficacy of the aesthetic triangle framework in assessing lip position changes after orthodontic treatment.
  • To determine the correlation between dentoalveolar changes and soft tissue lip movements.

Main Methods:

  • Correlative clinical study of 82 orthodontic patients.
  • Analysis of lateral cephalograms and profile photographs before and after treatment.
  • Assessment of lip position using the aesthetic triangle and incisor measurements.

Main Results:

  • Mandibular incisor inclination (IMPA) positively correlated with lower lip anterior displacement (r = 0.45).
  • IMPA explained 21% of lower lip migration variance (R² = 0.21).
  • Upper lip position showed weaker associations with maxillary incisor inclination.

Conclusions:

  • The aesthetic triangle is a valuable tool for interpreting orthodontic soft-tissue changes.
  • Lower lip prominence is predictably influenced by dentoalveolar mechanics.
  • Upper lip position is also influenced by underlying soft tissue morphology.