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Reliability of Moyers and Tanaka Johnston Mixed Dentition analysis in school children of Belgaum

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Original Article

Author Details : Vijayashree U H, Vijay R. Naik

Volume : 2, Issue : 4, Year : 2016

Article Page : 166-171

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Abstract

Context: The accuracy of Moyers proportionality tables and Tanaka and Johnston equations are fairly good when applied to children from northern European descents from which data were originally obtained. Because racial difference in mesiodistal tooth width is said to exist it is logical to doubt their applicability in other population.
Aims: The purpose of this study are to test the reliability of Moyers mixed dentition analysis and Tanaka Johnston equations in Belgaum population, so as to aid in treatment planning for the orthodontists in this region.
Methods and Material: A cross-sectional study comprising hundred subjects of Belgaum population who met our criteria (ages, 14-16 years; 50 boys, 50 girls) were selected from local schools. Mesiodistal dimensions of permanent mandibular incisors, maxillary and mandibular canines, and premolars were measured using a digital caliper with a resolution of 0.01 mm.
Statistical analysis: Students unpaired “t” test was used to compare the sex differences between the groups of teeth. Correlation and regression analysis were performed and standard regression equations for both sexes combined and for males and females separately were developed.
Results: Moyers probability table at 75% and Tanaka-Johnston equations overestimates the actual measurements in this population. Highly significant correlations were found between the mandibular incisors and the combined mesiodistal widths of the canines and premolars for the maxillary (r=0.37; P=0.00001) and mandibular (r=0.46; P=0.00001) segments.
Conclusions: Tanaka and Johnston and Moyers prediction methods were not accurate when applied to Belgaum population as it tends to overestimate the actual measurements. Due to their inadequacy new prediction tables & equations were formulated specifically for Belgaum population.

Keywords: Mixed dentition analysis, Prediction equations, Belgaum population

How to cite : Vijayashree U H, Naik V R, Reliability of Moyers and Tanaka Johnston Mixed Dentition analysis in school children of Belgaum. IP Indian J Orthod Dentofacial Res 2016;2(4):166-171

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