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An experimental study on mandibular expansion: increases in arch width and perimeter.
Mitsuru Motoyoshi1, Masayuki Hirabayashi, Takahisa Shimazaki
1Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan.
European Journal of Orthodontics
|May 11, 2002
Summary
Mandibular lateral expansion increases arch perimeter. A 1 mm arch width increase correlates to a 0.37 mm arch perimeter increase, aiding clinical prediction of expansion effects.
Area of Science:
- Orthodontics
- Biomechanical Engineering
- Dental Anthropology
Background:
- Mandibular lateral expansion is a common orthodontic procedure.
- Accurate prediction of arch perimeter changes is crucial for treatment planning.
Purpose of the Study:
- To estimate the increase in arch perimeter resulting from mandibular lateral expansion.
- To establish a quantitative relationship between arch width increase and arch perimeter change.
Main Methods:
- Three-dimensional (3D) finite element method (FEM) and computer graphics simulation were employed.
- A 3D model of a human mandible was created from CT scans.
- Rotational movement was simulated in the buccal segment around a calculated center of rotation.
Main Results:
- A 1 mm increase in arch width resulted in an estimated 0.37 mm increase in arch perimeter.
- Simulated lateral expansion showed a 7.76 mm change in inter-molar width.
- An interdental space of 1.43 mm was observed between the canine and first premolar.
Conclusions:
- The study provides a quantitative correlation between mandibular expansion and arch perimeter increase.
- These findings offer valuable clinical insights for predicting the outcomes of mandibular expansion procedures.