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Related Experiment Video

Updated: Feb 9, 2026

3D Imaging of Soft-Tissue Samples using an X-ray Specific Staining Method and Nanoscopic Computed Tomography
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A Perioral Soft Tissue evaluation after Orthognathic Surgery Using Three-Dimensional Computed Tomography Scan.

Rahul Tiwari1, P Srinivas Chakravarthi1, Vivekanand S Kattimani1

  • 1Department of Oral and Maxillofacial Surgery, Sibar Institute of Dental Sciences, Guntur, Andhra Pradesh, India.

The Open Dentistry Journal
|June 8, 2018
PubMed
Summary

Orthognathic surgery significantly alters nasolabial and mentolabial angles, but not lip width. Three-dimensional computed tomography (3DCT) reliably assesses these perioral soft tissue changes for improved surgical prediction.

Keywords:
3D AnalysisAssessmentEsthetic surgeryPerioral tissuesPredictionThree Dimensional Computed Tomography (3DCT)

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Plastic Surgery
  • Medical Imaging

Background:

  • Facial appearance significantly impacts social and psychological well-being.
  • Accurate jaw positioning in orthognathic surgery is vital, yet soft tissue response may not directly mirror skeletal movements.
  • Careful evaluation of soft tissue changes post-orthognathic surgery is essential for successful outcomes.

Purpose of the Study:

  • To evaluate perioral soft tissue alterations following orthognathic surgical procedures.
  • To compare pre- and post-operative lip width, nasolabial angle, and mentolabial angle using 3D computed tomography (3DCT).

Main Methods:

  • Ten patients undergoing orthognathic surgery for various deformities were included.
  • Pre- and post-operative 3DCT scans were acquired 12 months apart using an iCT 256 slice scanner.
  • Changes were analyzed using Dicom PMS D view software.

Main Results:

  • Significant changes were noted in the nasolabial angle after maxillary advancement (1.81°) and setback (2.73°).
  • Mandibular setback procedures significantly increased the mentolabial angle (3.27°).
  • Mandibular advancement resulted in variable mentolabial angle changes (increase of 3.6°, decrease of 7.6°).

Conclusions:

  • 3DCT revealed significant changes in nasolabial and mentolabial angles but not lip width.
  • 3DCT is a dependable tool for three-dimensional soft tissue assessment in orthognathic surgery.
  • Predicting nasolabial angle changes requires considering underlying factors beyond skeletal movement.