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Lower incisor space analysis: a contrast of methods.

E F Harris¹, J L Vaden, R A Williams

¹Department of Orthodontics, College of Dentistry, University of Tennessee, Memphis.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics

|November 1, 1987

Summary

Merrifield

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Area of Science:

Orthodontics and dental diagnostics.
Quantitative analysis of dental arch discrepancies.

Background:

Assessing lower anterior teeth crowding is crucial for orthodontic diagnosis.
Existing methods offer different perspectives on tooth alignment.

Purpose of the Study:

To describe and contrast two key methods for evaluating lower anterior teeth spacing and crowding.
To highlight the complementary nature of Merrifield's anterior space analysis and Little's irregularity index.

Main Methods:

Comparative analysis of Merrifield's anterior space analysis and Little's irregularity index.
Illustration of clinical cases demonstrating significant differences between the two assessment methods.

Main Results:

A modest correlation (rs = +0.53) was found between Merrifield's space analysis and Little's irregularity index.
Merrifield's method is more sensitive to tooth displacements, while Little's index is more responsive to axial inclinations (axiversions).

Conclusions:

Merrifield's space analysis and Little's irregularity index provide complementary, not interchangeable, information for assessing lower anterior teeth alignment.
Understanding the distinct sensitivities of each method is essential for accurate orthodontic diagnosis and treatment planning.

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