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Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition
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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.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|April 9, 2013
PubMed
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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.

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Last Updated: May 12, 2026

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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.