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

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Published on: February 23, 2024

Thresholds for clinically significant tooth-size discrepancy.

Toshiya Endo¹, Kenji Uchikura, Katsuyuki Ishida

¹Orthodontic Dentistry, The Nippon Dental University Nigata Hospital, Niigata, Japan. endoto@ngt.ndu.ac.jp

The Angle Orthodontist

|June 23, 2009

Summary

This summary is machine-generated.

Clinically significant tooth-size discrepancies are best defined by both Bolton ratios outside 2 standard deviations and millimeter corrections exceeding 2 mm for maxillary and/or mandibular adjustments. This dual approach refines the assessment of tooth discrepancies.

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Area of Science:

Orthodontics
Dental Morphology

Background:

Tooth-size discrepancy is a common orthodontic concern.
Accurate assessment is crucial for treatment planning.

Purpose of the Study:

To establish reliable thresholds for clinically significant tooth-size discrepancy.
To compare Bolton standard deviation (SD) and millimetric definitions.

Main Methods:

Mesiodistal tooth widths measured in 250 pretreatment dental casts.
Anterior and overall Bolton ratios calculated.
Required maxillary and mandibular corrections determined in millimeters.

Main Results:

Overall Bolton ratios outside 2 SDs consistently required >2 mm correction.
Millimetric corrections (>2 mm) did not always correlate with >2 SD Bolton ratios.
Anterior Bolton ratios outside 2 SDs showed variable millimetric correction needs.

Conclusions:

Tooth-size discrepancies should be evaluated using both percentage (Bolton ratios) and absolute millimetric measurements.
Ratios >2 SDs from the Bolton mean and discrepancies needing >2 mm correction are recommended thresholds for clinical significance.