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Soft tissue response to mandibular advancement using 3D CBCT scanning.

R C Almeida1, L H S Cevidanes, F A R Carvalho

  • 1Department of Orthodontics, State University of Rio de Janeiro, School of Dentistry, Rio de Janeiro, Brazil.

International Journal of Oral and Maxillofacial Surgery
|January 7, 2011
PubMed
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This study analyzed 3D soft tissue changes after mandibular advancement surgery. Results show significant correlation between soft and hard chin tissues, but lower lip adaptation is variable.

Area of Science:

  • Orthodontics and Maxillofacial Surgery
  • 3D Imaging in Medicine
  • Biomechanical Analysis of Facial Structures

Background:

  • Mandibular advancement surgery is a common procedure for treating skeletal discrepancies.
  • Understanding 3D soft tissue changes is crucial for predicting surgical outcomes.
  • Cone beam computed tomography (CBCT) offers detailed volumetric analysis for surgical planning.

Purpose of the Study:

  • To assess 3D soft tissue alterations following mandibular advancement surgery.
  • To evaluate the correlation between hard and soft tissue displacements.
  • To analyze postsurgical adaptation of the lower lip and chin.

Main Methods:

  • Prospective longitudinal study design.
  • Virtual model superimposition using cranial base registration from CBCT volumes.

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  • Computation of displacements for soft/hard chin, lower incisors, and lower lip at different time points (presurgery, splint removal, 1-year postsurgery).

    • Main Results:

    • Significant correlations observed between soft and hard tissue chin changes across all intervals (r = 0.77–0.92).
    • Lower lip showed statistically significant postsurgical adaptations, with changes partially explained by lower incisor position (31% at 1 year).
    • Soft tissue chin changes were largely explained by hard chin changes (73% at 1 year).

    Conclusions:

    • 3D soft tissue response to mandibular advancement surgery exhibits considerable variability.
    • The correlation between hard and soft chin tissues is strong and consistent.
    • Lower lip adaptation is less predictable and influenced by incisor position.