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Related Experiment Videos

Labial incompetence: a marker for progressive bone resorption in silastic chin augmentation

A Matarasso1, A C Elias, R L Elias

  • 1Division of Plastic Surgery, Albert Einstein College of Medicine, New York, N.Y., USA.

Plastic and Reconstructive Surgery
|November 1, 1996
PubMed
Summary

Labial incompetence and mentalis muscle hyperactivity are linked to progressive bone erosion below chin implants. This finding suggests a new approach for patients with lip strain to prevent mandibular resorption.

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Plastic Surgery
  • Biomaterials Science

Background:

  • Bone erosion is a common complication of silicone rubber implants used in augmentation genioplasty.
  • While generally self-limiting, severe erosion can jeopardize teeth or alter mental nerve sensibility, necessitating implant removal.
  • Current understanding of erosion etiology has overlooked the role of mentalis muscle function.

Observation:

  • A study examined six patients with Silastic implants, assessing labial competence and mentalis muscle activity.
  • Preoperative labial incompetence and mentalis muscle hyperactivity correlated with progressive bony erosion below the implants.
  • Erosion severity ranged from grade II to III, with one case exposing dental roots.

Findings:

  • The study identified a direct correlation between preoperative labial incompetence, mentalis muscle hyperactivity, and the progression of mandibular bone erosion.

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  • Mentalis muscle strain, even secondary to denture use, was associated with severe resorption.
  • Labial incompetence appears to be a reliable indicator of ongoing mandibular resorption post-Silastic augmentation.

    • Implications:

    • An alternative surgical approach may be beneficial for microgenic patients with lip strain and mentalis muscle hyperactivity.
    • Routine follow-up examinations and radiographs are recommended for patients with existing Silastic chin implants who exhibit labial incompetence.
    • Early identification of labial incompetence can help predict and potentially mitigate significant bone resorption and its complications.