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Quantitative Assessment Protocol for Facial Soft Tissue Volumetric Changes with Stereophotogrammetry

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Soft tissue changes and its stability as a sequlae to mandibular advancement.

Uday Kiran Uppada¹, Ramen Sinha¹, D Sreenatha Reddy¹

¹Department of Oral and Maxillofacial Surgery, Sri Sai College of Dental Surgery, Vikarabad, Andhra Pradesh, India.

Annals of Maxillofacial Surgery

|January 17, 2015

Summary

Mandibular advancement surgery significantly improves facial aesthetics by altering soft tissues. Angular changes are key to esthetic outcomes, while linear changes contribute, leading to a more balanced profile and improved lip function.

Keywords:

Bilateral sagittal split ramus osteotomy orthognathic maxilla profile cephalogram retrognathic mandible

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Area of Science:

Orthodontics and Maxillofacial Surgery
Esthetic Dentistry
Skeletal Malocclusion Correction

Background:

Skeletal class II malocclusion often requires surgical intervention for correction.
Mandibular advancement surgery, specifically bilateral sagittal split osteotomy, is a common procedure.
Understanding soft tissue changes post-surgery is crucial for patient expectations.

Purpose of the Study:

To predict and evaluate soft tissue changes after mandibular advancement surgery.
To assess the stability of these soft tissue alterations over time.
To provide patients with reliable information on expected esthetic outcomes.

Main Methods:

Prospective study of 20 adult patients with skeletal class II malocclusion.
Bilateral sagittal split osteotomy for an average 8 mm mandibular advancement with rigid fixation.
Analysis of 12 linear and 4 angular cephalometric measurements at pre-surgery, 1 month, and 6 months post-surgery.

Main Results:

Angular measurements demonstrated more significant changes than linear measurements.
Esthetic improvements were directly correlated with angular changes.
Observed improvements include reduced facial convexity, increased lower facial height, and enhanced lip competency.

Conclusions:

Soft tissue response stability is linked to surgical stability and hard tissue remodeling.
Maturation and aging also influence long-term soft tissue changes.
Surgical mandibular advancement leads to predictable and favorable esthetic results.