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Three-dimensional mandibular regional superimposition in growing patients.
Tung Nguyen1, Lucia Cevidanes2, Lorenzo Franchi3
1Department of Orthodontics, University of North Carolina, Chapel Hill, NC.
Summary
The chin and symphysis are stable 3D regions for mandibular superimposition in growing patients. This study confirms their reliability and reproducibility for accurate analysis.
Area of Science:
- Orthodontics and Dental Imaging
- 3D Craniofacial Analysis
Background:
- Mandibular growth analysis requires stable reference points for accurate 3D superimposition.
- Previous methods lacked consistent reproducibility in growing individuals.
Purpose of the Study:
- Identify stable 3D mandibular structures in growing patients.
- Assess the reproducibility of 3D regional superimposition using identified areas.
Main Methods:
- Voxel-based 3D regional mandibular registrations were performed on the chin and symphysis of 20 growing patients.
- Longitudinal CBCT scans of 25 patients were used to evaluate reliability between two observers.
- Absolute mean errors and intraclass correlation coefficients were calculated to assess stability and reproducibility.
Main Results:
- The chin (0.37 ± 0.16 mm) and symphysis (0.4 ± 0.15 mm) demonstrated high precision and stability.
- The third molar region showed significant registration error (1.94 ± 0.06 mm).
- Inter-observer reliability for chin and symphysis registrations was high (0.12 ± 1.1 mm), confirmed by ICC.
Conclusions:
- The anterior chin and symphysis regions are stable and reliable landmarks for 3D mandibular regional superimposition in growing patients.
- These findings support the use of these regions for accurate longitudinal 3D analysis of mandibular growth and development.
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