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      Comparison of mesiodistal tooth widths in Caucasian, African and Japanese individuals with Brazilian ancestry and normal occlusion

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          Abstract

          OBJECTIVE: To observe the presence of sexual dimorphism and compare the mesiodistal width of the teeth in Caucasian, African and Japanese individuals with Brazilian ancestry not orthodontically treated and with normal occlusion. METHODS: One hundred pairs of dental casts were used. It was measured, from first molar to first molar in both arches, the teeth's mesiodistal widths, using a digital caliper. For the statistical analysis of results Kolmogorov-Smirnov, t test, ANOVA and Tukey's test (p < 0.05) were used. RESULTS: Sexual dimorphism occurred on the three evaluated groups, and the highest mesiodistal widths were found in males. There was statistically significant difference between racial groups in all evaluated teeth in males. However, in females, this same difference was found only on upper lateral incisor and first molar; and lower lateral incisor, canine, first premolar and first molar. CONCLUSION: Most of mesiodistal measures present particular characteristics in relation to gender, with higher values for males, and to race, with a tendency for African to present greater mesiodistal distance of the teeth, followed by Japanese and Caucasians, respectively, important for the correct diagnosis and orthodontic planning.

          Translated abstract

          OBJETIVO: observar a presença de dimorfismo sexual e comparar a largura mesiodistal dos dentes em indivíduos brasileiros leucodermas, melanodermas e xantodermas não tratados ortodonticamente e com oclusão normal. MÉTODOS: foram utilizados 100 pares de modelos de gesso ortodônticos. As larguras mesiodistais dos dentes foram medidas de primeiro molar a primeiro molar, em ambas as arcadas, utilizando um paquímetro digital. Para a análise estatística dos resultados foi utilizado o teste de Kolmogorov-Smirnov, o teste t, a Análise de Variância (ANOVA) a um critério e o teste de Tukey (p < 0,05). RESULTADOS: ocorreu dimorfismo sexual nos três grupos avaliados, sendo que as maiores larguras mesiodistais foram encontradas no sexo masculino. Houve diferença estatisticamente significativa entre os grupos raciais em todos os dentes avaliados para o sexo masculino. Já no sexo feminino, essa mesma diferença foi encontrada apenas nos dentes incisivo lateral e primeiro molar superior, e incisivo lateral, canino, primeiro pré-molar e primeiro molar inferior. CONCLUSÃO: a maioria das medidas dentárias mesiodistais apresentam características próprias em relação ao sexo, com valores maiores para o sexo masculino; e em relação à raça, com uma tendência dos melanodermas apresentarem maior distância mesiodistal dos dentes, seguidos pelos xantodermas e leucodermas, respectivamente. O conhecimento dessas diferenças é importante para o correto diagnóstico e planejamento ortodôntico.

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          Most cited references31

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          The clinical application of a tooth-size analysis

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            Comparisons of mesiodistal and buccolingual crown dimensions of the permanent teeth in three populations from Egypt, Mexico, and the United States.

            The purpose of this study is to examine the mesiodistal and buccolingual crown dimensions in three populations--57 subjects (35 boys and 22 girls) from Iowa City, Iowa; 54 subjects (30 boys and 24 girls) from Alexandria, Egypt; and 60 subjects (26 boys and 34 girls) from Chihuahua, Mexico. All subjects had normal Class I occlusion, with no history of orthodontic treatment. Comparisons of single teeth as well as sums of groups of teeth were performed between boys and girls within and between the two populations. The analysis of variance general linear models procedure was used for statistical comparisons. The findings from this investigation indicated that (1) differences between antimeres are of small magnitude and of no statistical significance; (2) all populations have significant differences in tooth dimensions between the sexes with boys having larger canines and first molars; (3) there is greater variation in the buccolingual than in the mesiodistal dimensions among the three populations; (4) there is a greater similarity in tooth dimensions among the boys from the three populations than among the girls, but the magnitude of these differences is considered to be of little clinical significance; and (5) standards for the buccolingual diameters were developed for the three populations. As a result, it was concluded that prediction equations used for space analysis in the mixed dentition to determine tooth size-arch length discrepancies in the Iowa population can also be used for persons from Egypt and from the northern part of the Mexican Republic, with some suggested modifications.
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              A biometric study of tooth size and dental crowding.

              A study was conducted for the purpose of comparing mesiodistal tooth widths between a group of patients with good tooth alignment and a group of patients with crowded dental arches. Crowded arches were defined as those with more than 4 mm. of space deficiency. The hypothesis tested was whether the arches with more than 4 mm. of crowding consistently had larger teeth than the ones with lesser or no crowding. The difference in sizes between the groups (forty males and forty females) for all teeth measured was found to be statistically significant (p less than 0.001). The multivariate data analysis indicated that the two groups were derived from two different populations and that the maxillary lateral incisors and second premolars and the mandibular canines and premolars were particularly different in these groups. It was also determined that the teeth in males were uniformly larger than in females, but not to a statistically significant level. There was less correlation, however, between the sex and the status of the tooth alignment in dental arches, so that both sexes had similar distribution of crowding versus noncrowding. On the basis of this study of eighty North American Caucasians, it is suggested that one should consider the sum of mesiodistal widths of teeth, in addition to the arch length analysis, in formulating an orthodontic treatment plan. When the cumulative tooth mass of the twenty permanent teeth is 140 mm. or more, the clinician may want to consider extraction therapy for such a case.
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                Author and article information

                Journal
                dpjo
                Dental Press Journal of Orthodontics
                Dental Press J. Orthod.
                Dental Press International (Maringá, PR, Brazil )
                2176-9451
                2177-6709
                June 2013
                : 18
                : 3
                : 130-135
                Affiliations
                [01] orgnameNorth Paraná University
                [02] Bauru orgnameUSP
                [03] Bauru orgnameUSP orgdiv1Orthodontics and Public Health orgdiv2Pediatric Dentistry Department
                Article
                S2176-94512013000300021 S2176-9451(13)01800300021
                10.1590/S2176-94512013000300021
                a5635d7c-1803-4aa7-ad70-ce396a345067

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 27 April 2011
                : 24 November 2009
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 31, Pages: 6
                Product

                SciELO Brazil

                Categories
                Original Articles

                Tooth,Orthodontics,Ortodontia,Balanced dental occlusion,Dente,Oclusão dentária balanceada

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