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Related Experiment Videos

Short-term and long-term soft tissue profile changes after mandibular advancements using rigid fixation techniques.

R Hernandez-Orsini, A Jacobson, D M Sarver

    The International Journal of Adult Orthodontics and Orthognathic Surgery
    |January 1, 1989
    PubMed
    Summary

    Surgical advancement of the mandible leads to predictable soft tissue profile changes. Long-term data shows a 1:1 horizontal ratio for soft tissue overlying bone, but a different ratio for the lower lip.

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    Area of Science:

    • Orthodontics and Maxillofacial Surgery
    • Plastic Surgery
    • Facial Aesthetics

    Background:

    • Surgical advancement of the mandible is a common procedure to correct skeletal discrepancies.
    • Understanding soft tissue response is crucial for predicting aesthetic outcomes.
    • Limited data exists on the long-term soft tissue profile changes following mandibular advancement.

    Purpose of the Study:

    • To quantify short- and long-term soft tissue profile changes after surgical mandibular advancement.
    • To establish a predictive database for facial changes post-surgery.
    • To analyze the correlation between hard and soft tissue movements.

    Main Methods:

    • Serial cephalometric tracings were used to identify hard and soft tissue landmarks.
    • Data was collected from 31 patients undergoing surgical mandibular advancement.

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  • Measurements were analyzed at short-term (average 2.7 months) and long-term (average 14.0 months) post-surgery.

    • Main Results:

    • Long-term horizontal soft tissue changes overlying skeletal structures mirrored hard tissue changes in a 1:1 ratio.
    • Horizontal changes between the mandibular incisor and lower lip showed a different ratio (0.43:1.00).
    • Short-term soft tissue changes demonstrated stability compared to long-term outcomes.

    Conclusions:

    • Soft tissue profile changes following mandibular advancement are predictable, especially in the long term.
    • The ratio of soft tissue to hard tissue movement varies depending on the specific facial region.
    • This study provides valuable data for surgeons to predict facial aesthetic outcomes.