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Quantitative Assessment Protocol for Facial Soft Tissue Volumetric Changes with Stereophotogrammetry

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How the lower face soft tissue changes after mandibular advancement or setback.

Patrícia V M Alves¹, Josmar Mazucheli, Carlos J Vogel

¹Orthodontics, Federal University of Rio de Janeiro, Brazil. patricia.alves.p@gmail.com

The Journal of Craniofacial Surgery

|June 4, 2008

Summary

Orthognathic surgery significantly alters soft tissues in the lower face, particularly the chin and lip, following mandibular advancement. Bone and dental structures remained stable in these orthodontic cases.

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Area of Science:

Orthodontics
Oral and Maxillofacial Surgery
Craniofacial Anatomy

Background:

Orthognathic surgery is crucial for correcting skeletal discrepancies.
Understanding soft tissue response is vital for treatment planning.

Purpose of the Study:

To evaluate short-term soft and hard tissue changes in the lower face after orthognathic surgery.
To provide data for improved orthodontic and orthognathic planning.

Main Methods:

Lateral cephalograms were analyzed at T0 (pre-surgery), T1 (6 months post-surgery), and T2 (1 year post-surgery).
Measurements included soft tissue pogonion, lower lip, and underlying bone/dental structures.
Patients underwent either mandibular advancement (Class II) or setback (Class III).

Main Results:

Mandibular advancement cases showed significant changes in soft tissue pogonion and lower lip.
Underlying bone and dental structures remained largely unchanged after mandibular advancement.
Mandibular setback cases exhibited a statistically significant change only in the hard tissue pogonion.

Conclusions:

Soft tissue changes are prominent after mandibular advancement in orthognathic surgery.
Hard tissue pogonion is the primary indicator of change in mandibular setback procedures.
These findings aid in refining surgical planning and predicting outcomes.