Abstract

Objective: The aim of this study was to verify the applicability of Moyer’s prediction tables to estimate the mesio-distal diameter of canines and pre-molars in a population of North-Eastern Brazil. Materials and Methods: A sample of 100 plaster moulds of 12-18-year-old patients was selected from the dental archives of the Brazilian Association of Orthodontists Dental School Clinic in the city of João Pessoa, State of Paraiba. Analyses were performed with R software (version 3.1.3). The upper and lower canines and premolars on both sides of the arch were measured. Data Analysis: Linear regression analysis was used to assess the closeness of the estimated values in each percentile of Moyer’s prediction table. Analyses were performed at a significance level of 5%. Results: Gender dimorphism (P < 0.001) was found in both upper and lower arches. In the upper arch, the best regression models for data analysis of female, male and both were, respectively, p5 and p6”, p25 and p35, and p35 and 75, whereas in the lower arch were p15, p35 and p75, with “p75 being the best-fitted percentile following application of correction equations for both genders. Conclusions: The Moyer’s prediction table can be applied for estimating the mesio-distal diameters of canines and pre-molars, provided that a correction factor is used for the population under study.

Highlights

  • The majority of malocclusions are related to an imbalance between mesio-distal diameter of the teeth and their bone support [1]

  • As there are several changes within the alveoli due to bone growth during the phase of mixed dentition, the majority of malocclusions occur in these sites

  • All the plaster moulds of 12-18-year-old patients who attended the Brazilian Association of Orthodontists Dental School Clinic in the city of João Pessoa, State of Paraiba, between 2010 and 2015 were evaluated for selection, resulting in a sample of 100 moulds according to inclusion and exclusion criteria

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Summary

Introduction

The majority of malocclusions are related to an imbalance between mesio-distal diameter of the teeth and their bone support [1]. Because some teeth (e.g. canines and pre-molars) are still unerupted, it is complicated to evaluate any discrepancy between teeth and bone supports. The Moyer’s analysis is based on a statistical method in which one can predict the sum of mesiodistal measurements of unerupted canines and pre-molars through its relationship with the sum of the mesio-distal measurements of the already erupted lower incisors [6]. The objective of this work was to assess the applicability of the Moyer’s prediction tables to

Materials and Methods
TABLES I
Discussion
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