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Three-dimensional soft tissue changes according to skeletal changes after mandibular setback surgery by using
Kyung-A Kim1, Ye-Jin Chang2, Su-Hyun Lee2
1Department of Orthodontics, School of Dentistry, Kyung Hee University, 1 Hoegi-Dong, Dongdaemoon-Ku, Seoul, 130-701, South Korea.
Progress in Orthodontics
|July 2, 2019
Summary
Mandibular setback surgery (MSS) for Class III malocclusion significantly alters facial structure. Soft tissue changes, particularly in the lips and chin, correlate with bone movement, showing a distinct transverse gradient.
Area of Science:
- Orthodontics and Dentofacial Orthopedics
- 3D Imaging in Craniofacial Surgery
- Skeletal Malocclusion Correction
Background:
- Skeletal Class III malocclusion presents significant aesthetic and functional challenges.
- Mandibular setback surgery (MSS) is a common treatment for severe Class III malocclusion.
- Understanding the three-dimensional (3D) soft tissue response to skeletal movement is crucial for predictable outcomes.
Purpose of the Study:
- To evaluate the 3D skeletal and soft tissue changes following mandibular setback surgery (MSS) in adult Korean patients with skeletal Class III malocclusion.
- To analyze the correlation between hard tissue movements and soft tissue responses using cone-beam computed tomography (CBCT) and 3D facial scanning.
Main Methods:
- Twenty-eight adult Korean patients with skeletal Class III malocclusion underwent MSS.
- CBCT and 3D facial scans were acquired pre-operatively and 6 months post-operatively.
- Superimposition of 3D data allowed for the analysis of nine skeletal and 18 soft tissue landmarks, with statistical correlation tests performed.
Main Results:
- MSS resulted in an average transverse correction of 2.45 mm, mandibular setback of 5.80 mm, and vertical reduction of 1.64 mm at the menton.
- Significant transverse and anteroposterior soft tissue movements of the lips and chin were observed, correlating with hard tissue changes.
- A distinct pattern of increasing soft tissue response from the lips to the chin was noted in the transverse dimension.
Conclusions:
- Soft tissue changes after mandibular setback surgery in Class III malocclusion exhibit a predictable, increasing gradient from the lips to the chin in the transverse plane.
- The study highlights the significant correlation between hard and soft tissue movements, aiding in surgical planning and outcome prediction.
- 3D imaging techniques provide valuable insights into the complex interplay of skeletal and soft tissue dynamics post-orthognathic surgery.
Keywords:
3D soft tissue changeCBCTClass IIIFacial scan imageMandibular setback surgeryStructured light scannerMore Related Videos
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