ResumoIntrodução: A má oclusão de Classe III é uma discrepância anteroposterior, que pode ser caracterizada por crescimento mandibular excessivo e/ou retrusão maxilar. Objetivo: Avaliar as características tegumentares de pacientes Classe III na cidade de Mossoró, Estado do Rio Grande do Norte, além de apontar se há associação entre as variáveis cefalométricas e o gênero. Material e método: Foi selecionada uma amostra retrospectiva de 52 telerradiografias em norma lateral de indivíduos adultos, com perfil facial côncavo e valores de ANB e AOBO negativos. As telerradiografias selecionadas foram analisadas no programa Radiocef Studio 2. Posteriormente, realizou-se uma análise descritiva das variáveis, calculando-se média, desvio-padrão, mínimo e máximo. O teste t para dados independentes foi utilizado para detectar diferenças entre os gêneros. Resultado: O perfil facial apresentou valor médio de 176,9°±5,9; o ângulo nasolabial, 91,9°±13,1; o sulco mentolabial, 137,9°±13,3, e a projeção nasal, 16,2 mm±4,5. Os terços faciais superior e inferior apresentaram as seguintes médias: 60,7 mm±14,3 e 70,5 mm±19. Para as espessuras labiais superior e inferior, obtiveram-se as médias 13,4 mm±5,1 e 13,9 mm±4,8, respectivamente. A protrusão labial superior revelou como média 3,3 mm±2,7 e a inferior, 4 mm±3,1. Conclusão: As principais características cefalométricas encontradas foram: perfil facial côncavo; ângulo nasolabial normal; sulco mentolabial pouco profundo e projeção nasal normal. Quanto aos terços faciais, apenas o inferior apresentou-se aumentado. Ambos os lábios mostraram-se espessos, mas somente o inferior revelou-se protruso. Tais características não foram diferentes entre os gêneros e demonstraram maior participação mandibular no perfil. Porém, para melhor conhecimento do tema, são necessários mais estudos, com amostras maiores e desenhos metodológicos mais sofisticados.Descritores: Cefalometria; má oclusão; má oclusão de Classe III. AbstractIntroduction: Class III malocclusion is defined as anteroposterior discrepancy, which may occur as result of maxillary deficiency and/or mandibular excess. Objective: Evaluate the characteristics of the soft tissue of individuals with Class III in the city of Mossoró, state of Rio Grande do Norte and to observe if there is association between these characteristics with male and female genders. Material and method: It was selected a retrospective sample of 52 lateral cephalometric radiograph of adults, with concave facial profile, negative ANB and negative AOBO. The radiographs were analyzed in the program Radiocef Studio 2. Then, descriptive analysis was performed for all cephalometric variables, calculating mean, standard deviation, maximum and minimum . In order to detect the differences between genders, the t test for independent data was used. Result: The facial profile presented as mean 176,9°±5,9; the nasolabial angle, 91.9º±13.1; the mentolabial sulcus, 137.9º±13.3; and the nasal projection, 16,2mm±4,5; the upper and lower facial thirds, 60,7mm±14,3 and 70,5mm±19, respect...

a b s t r a c tBackground: Orthodontists evaluate the cephalometric analysis in order to determine a correct diagnosis. In clinical practice, oral radiologists are the group of specialists who run this test. However, due to several factors, some orthodontists feel the need to confirm the results reported by oral radiology clinics and perform the cephalometric analysis again. The main objective of this study was to assess the consistency among cephalometric measurements obtained by orthodontists and radiologists using computerized cephalometric analysis software. Methods: Thirty orthodontists and 30 oral radiologists identified 18 cephalometric landmarks using the same computer, as directed by the software Radiocef Studio 2 Ò . From there, 14 cephalometric parameters were generated. In order to verify the intraexaminer agreement, 10 professionals from each group repeated the identification of the landmarks with a minimum interval of 8 days between the two markings. The intragroup variability was calculated based on the coefficients of variation. The comparison between groups was performed by using the Student t-test and the ManneWhitney test. Results: In the group of orthodontists, the measurements of Pog and 1-NB, SL, line S-Ls, Line S-Li, and 1.NB showed high internal variability. In the group of radiologists, the same occurred with the values of Pog and 1-NB, line S-Ls, Line S-Li, and 1.NA. In the comparison between groups, all the analyzed linear measurements (Pog and 1-NB, SL, Line S-Ls, and Line S-Li) and two angular measurements (1.SN and AF) showed statistically significant differences between radiologists and orthodontists (P < 0.05). Conclusion: All linear measures assessed (and only two angular measures) indicated an inconsistency between orthodontists and radiologists.