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Related Experiment Videos

Lip form responses to changes in maxillary incisor position

S C Jin1, K Kasai, T Iwasawa

  • 1Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan.

The Journal of Nihon University School of Dentistry
|December 1, 1996
PubMed
Summary

This study evaluated a 3D laser system for facial measurements and analyzed lower facial changes from upper incisor protrusion. Results show lip thickness relates to lip corners and stomion position, not overall lip form.

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Area of Science:

  • Dentistry
  • Orthodontics
  • Biomedical Engineering

Background:

  • Accurate measurement of facial morphology is crucial in orthodontics.
  • Understanding lower facial changes due to incisor protrusion informs treatment planning.

Purpose of the Study:

  • To assess the accuracy of a laser 3D measurement system for facial profiles.
  • To investigate lower facial morphological changes from experimental upper incisor protrusion.
  • To examine relationships between lip form, lip thickness, and hard tissue changes.

Main Methods:

  • Utilized a computerized 3D laser scanning system for facial morphology evaluation.
  • Measured 24 Japanese male dental students with normal occlusion.
  • Assessed measurement error (<0.5 mm) and recording reproducibility.

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Main Results:

  • Lip thickness was not associated with overall lip form changes.
  • A relationship was observed between lip corners, lip thickness, and stomion position.
  • Hard tissue and lip changes showed low correlation, varying with protrusion magnitude.

Conclusions:

  • The 3D laser system offers accurate facial measurements.
  • Incisor protrusion affects lower facial morphology, particularly lip thickness and stomion position.
  • Lip form changes are complex and not solely dependent on lip thickness.