Related Experiment Video
Updated: Sep 4, 2025
10:42
A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible
Published on: January 28, 2020
6.6K
Introducing surface-to-surface matching technique to evaluate mandibular symmetry: A retrospective study
Yajuan Xie1,2, Runling Zeng1,2, Jiayin Yan1,2
1Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, China.
Heliyon
|July 20, 2022
Summary
This study used a 3D surface-to-surface matching technique to find mandibular asymmetry in teenagers and adults with unilateral second molar scissor bite, noting more affected units in adults.
Area of Science:
- Dentistry
- Orthodontics
- Biomedical Engineering
Background:
- Unilateral second molar scissor bite can lead to mandibular asymmetry.
- Evaluating this asymmetry requires precise measurement techniques.
Purpose of the Study:
- To introduce and validate a 3D surface-to-surface matching technique for assessing mandibular symmetry.
- To quantify mandibular asymmetry in teenagers and adults with unilateral second molar scissor bite.
Main Methods:
- Cone-beam computed tomography (CBCT) scans of 73 patients with unilateral second molar scissor bite and 73 controls were used.
- 3D mandible and functional unit models were created.
- A 3D surface-to-surface matching technique was applied for deviation analysis and symmetry evaluation.
Main Results:
- Mandibular asymmetry was detected in both teenage and adult patient groups compared to controls.
- Teenagers showed reduced symmetry in the entire mandible, mandibular body, and condylar process.
- Adults exhibited asymmetry in more mandibular units, including the entire mandible, alveolar process, mandibular body, chin process, ramus, and condylar process.
Conclusions:
- The 3D surface-to-surface matching technique effectively identifies mandibular asymmetry associated with unilateral second molar scissor bite.
- Adult patients demonstrated more widespread mandibular asymmetry than teenagers.
- This technique provides valuable visual and quantitative data for mandible growth studies, orthodontic treatment, and orthognathic surgery planning.
