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Fabricating nasal prostheses using four-dimensional facial expression models.

Fumi Yoshioka1, Shogo Ozawa1, Ayumi Matsuoka1

  • 1Department of Removable Prosthodontics, School of Dentistry, Aichi Gakuin University, Japan.

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|October 8, 2020
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Summary

Four-dimensional (4D) facial models improve facial prosthesis fit. These advanced models enhance marginal sealing and attachment during facial movement, offering better outcomes for patients with facial defects.

Keywords:
4D facial expression modelFfacial prosthesisHomologous modelMorphing

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Area of Science:

  • Biomedical Engineering
  • Craniofacial Reconstruction
  • Medical Device Design

Background:

  • Facial prostheses present challenges in maintaining stable positioning due to facial skin movement.
  • Conventional fabrication relies on static models, limiting prosthesis adaptation to dynamic facial expressions.

Purpose of the Study:

  • To develop and evaluate four-dimensional (4D) facial expression models for fabricating improved facial prostheses.
  • To compare the accuracy and fit of prostheses made with 4D models versus traditional two-point methods.

Main Methods:

  • Seven patients with nasal defects underwent 4D facial scanning.
  • Five nasal prostheses were fabricated per patient using morphing techniques across a range of facial expressions.
  • Prostheses were evaluated objectively and subjectively for fit and marginal sealing.

Main Results:

  • Subjective evaluations indicated superior marginal sealing of 4D-model prostheses across expressions.
  • Objective assessments demonstrated enhanced attachment and stability during facial movement.
  • 4D models significantly improved prosthesis performance compared to conventional methods.

Conclusions:

  • Four-dimensional facial expression models offer enhanced marginal sealing for facial prostheses.
  • This novel approach improves prosthesis fit and function, addressing limitations of static modeling techniques.