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Predicting tooth-size discrepancy: A new formula utilizing revised landmarks and 3-dimensional laser scanning
Emil Bailey1, Gerald Nelson, Arthur J Miller
1Division of Orthodontics, Department of Orofacial Sciences, School of Dentistry, University of California at San Francisco, CA, USA.
Summary
A new analysis of tooth-size discrepancies offers more accurate forecasting by considering functional arch components alongside tooth size. This method improves predictions for orthodontic treatment planning.
Area of Science:
- Dentistry
- Orthodontics
- Dental Morphology
Background:
- Accurate forecasting of tooth-size discrepancies is crucial for successful orthodontic treatment.
- Traditional methods may not fully capture the nuances of dental arch relationships.
Purpose of the Study:
- To develop and evaluate a novel formula for predicting tooth-size discrepancies.
- To incorporate functional arch components, based on cusp-fossa interdigitation, into discrepancy analysis.
Main Methods:
- 141 dental casts of normal occlusions were scanned using 3D laser scanning.
- Tooth and arch component sizes were measured using specialized software.
- Tooth-size discrepancies were calculated using the original Bolton analysis and the new Johnson/Bailey analysis.
Main Results:
- The Johnson/Bailey analysis provided four distinct ratios for anterior, posterior, and overall arch discrepancies.
- The Bolton analysis yielded anterior and overall ratios.
- The new analysis demonstrated specific ranges and means for each calculated ratio, indicating its potential for detailed assessment.
Conclusions:
- The Johnson/Bailey analysis offers a more precise method for forecasting tooth-size discrepancies.
- This new approach utilizes clinically relevant functional arch components for improved accuracy in orthodontic treatment planning.
