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Related Experiment Videos

Predictability of upper lip soft tissue changes with maxillary advancement.

J P Stella1, M R Streater, B N Epker

  • 1Oral and Maxillofacial Surgery Department, John Peter Smith Hospital, Fort Worth, Texas 76104.

Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons
|July 1, 1989
PubMed
Summary
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Predicting soft tissue changes after maxillary advancement surgery is challenging. Thinner lips show a better correlation between bone movement and soft tissue response than thicker lips.

Area of Science:

  • Craniofacial surgery
  • Orthognathic surgery
  • Plastic surgery

Background:

  • Accurate prediction of soft tissue changes after maxillary advancement is crucial for esthetic outcomes.
  • Understanding the relationship between hard tissue movement and soft tissue response is essential.

Purpose of the Study:

  • To investigate the correlation between the magnitude of maxillary advancement and the resulting soft tissue changes at the subnasale (Sn).
  • To analyze how lip thickness influences the predictability of soft tissue response to maxillary advancement.

Main Methods:

  • Studied 21 adult patients undergoing isolated maxillary advancement (LeFort I osteotomy).
  • Subdivided patients into groups based on lip thickness (10-17 mm and >17 mm).
  • Utilized linear regression to analyze the relationship between maxillary advancement and Sn change, considering lip thickness.

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Main Results:

  • Overall, a general correlation between bony advancement and soft tissue changes had high standard deviations, indicating low predictability.
  • Patients with thinner lips (10-17 mm) demonstrated a better correlation between bone movement and soft tissue changes.
  • Increased lip thickness (>17 mm) resulted in less predictable soft and hard tissue changes.

Conclusions:

  • Lip thickness is a significant factor affecting the predictability of soft tissue esthetic outcomes after maxillary advancement.
  • Thinner lips exhibit a more predictable response to surgical advancement compared to thicker lips.
  • Further research is needed to refine predictive models for soft tissue changes in orthognathic surgery.