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Increase in arch perimeter due to orthodontic expansion
N Germane1, S J Lindauer, L K Rubenstein
1Department of Orthodontics, School of Dentistry, Medical College of Georgia, Augusta.
Summary
Incisor advancement is the most effective orthodontic expansion for increasing mandibular arch perimeter. Molar and canine expansion offer intermediate and lesser effects, respectively, with combined approaches yielding additive benefits.
Area of Science:
- Orthodontics and Dental Biomechanics
- Computational Modeling in Dentistry
Background:
- Mandibular arch perimeter is a critical factor in dental arch form and stability.
- Understanding the quantitative effects of different orthodontic expansion techniques is essential for treatment planning.
Purpose of the Study:
- To quantitatively compare the impact of various orthodontic expansion types on mandibular arch perimeter using a mathematical model.
- To determine the relative effectiveness of molar, canine, and incisor expansion on arch perimeter increase.
Main Methods:
- Development of a mathematical model representing mandibular arch form using spline interpolation.
- Simulation of individual and combined expansion of intermolar width, intercanine width, and midline arch length up to 5 mm.
- Measurement of resultant changes in mandibular arch perimeter.
Main Results:
- Incisor advancement significantly increased arch perimeter, approximately four times more effectively than molar expansion.
- Canine expansion demonstrated an intermediate effect on arch perimeter.
- Combined expansion techniques produced additive increases in arch perimeter, with molar-canine expansion being nearly as effective as incisor advancement alone.
Conclusions:
- Incisor advancement is the most efficient method for increasing mandibular arch perimeter among the evaluated orthodontic expansion techniques.
- The effectiveness of expansion varies by tooth type, with incisors yielding the greatest perimeter increase.
- Combined expansion strategies can achieve substantial arch perimeter gains, offering flexibility in orthodontic treatment planning.