The current malocclusion classification systems, routinely used in orthodontic practice, still yield different disagreement values among examiners who evaluate one and the same clinical case. Objectives: The purpose of this study was to evaluate the agreement effectiveness of a Newly Proposed System for malocclusion classification - in the anteroposterior orientation -, conceived by the present authors.Thirty-four examiners evaluated 15 malocclusion cases using Angle's, Katz’s and the Newly Proposed System classifications to determine which system shows the highest degree of agreement and accuracy when results were communicated among examiners. A comparison of the classifications attributed to each individual case and the mean figures found for the total data in each classification showed that the methods advanced by the Newly Proposed System yielded a higher degree of agreement (73.33%) than Angle’s (26.66%) and Katz’s (26.66%). The Newly Proposed System proved to be an outstanding malocclusion classification system with a high degree of agreement among examiners. On the other hand, however, further studies involving a wider sample of malocclusions and a greater number of examiners are strongly recommended if more conclusive results are to be achieved.

Los sistemas actuales de clasificación de maloclusión, habitualmente utilizados en la práctica de ortodoncia, siendo los distintos valores un desacuerdo entre los examinadores que evalúan un caso clínico y o el mismo caso. El objetivo de este estudio fue evaluar la eficacia de una nuevo sistema propuesto para la clasificación de maloclusión - en la orientación anteroposterior -, concebida por los autores de este estudio. Treinta y cuatro examinadores evaluaron 15 casos de maloclusión utilizando las clasificaciones de Angle, Katz y el nuevo sistema propuesto de clasificación, para determinar cual de los sistemas muestran el mayor grado de acuerdo y precisión cuando los resultados fueron comunicados entre los examinadores. La comparación de las clasificaciones atribuidas a cada caso particular y las medias encontrada para los datos totales de cada clasificación mostró que los métodos avanzados del nuevo sistema propuesto dió un mayor grado de acuerdo (73,33%) que (Angle 26,66%) y Katz (26,66%). El nuevo sistema propuesto demostró ser un sistema de clasificación de la maloclusión con un alto grado de acuerdo entre los examinadores. Sin embargo, otros estudios con una muestra más amplia de maloclusiones y un mayor número de examinadores se recomienda para alcanzar resultados más concluyentes.

O presente estudo foi realizado em modelos de gesso e radiografias cefalométricas laterais de 30 indivíduos brasileiros, leucodermas, sendo 15 do sexo feminino e 15 do sexo masculino, com idades variando de 18 anos a 27 anos e 4 meses, todos portadores de oclusão excelente e bom perfil facial. Os objetivos foram verificar a existência de discrepância dentária de Bolton, obter valores médios para a sobremordida (overbite), sobressaliência (overjet), curva de Spee e ângulo interincisivo e verificar a existência de correlação entre essas variáveis. As medições foram realizadas por um único avaliador e o procedimento realizado duas vezes com auxílio de um paquímetro digital modificado de alta precisão. Observou-se que a amostra de oclusão normal não apresentou discrepância dentária entre os doze dentes dos arcos opostos e as razões total (91,46) e anterior (77,83) foram próximos aos dos propostos por Bolton. Os valores médios encontrados como padrão para a amostra de oclusão normal de indivíduos brasileiros foram determinados em: 2,45 mm para a sobremordida; 1,92 mm para a sobressaliência; 1,01 mm para a curva de Spee e 129,57(0) para o ângulo interincisivo, havendo apenas correlação significativa entre sobressaliência e as classes de sobremordida.

The present study was performed on dental casts and lateral cephalometric films of 30 Caucasian Brazilian individuals (15 males and 15 females) aged 18 to 27 years and 4 months, all presenting normal occlusion and satisfactory facial profile. The aims were to investigate the existence of dental discrepancies according to Bolton's criteria, to obtain mean values for overbite, overjet, curve of Spee and interincisal angle, and to demonstrate any correlation among these parameters. A single calibrated operator measured each variable characteristics and the process was recorded twice with an accurate modified digital caliper. It was observed that the sample of normal occlusion did not present any dental discrepancy among the 12 teeth of opposite arches. The overall ratio (91.46) and anterior ratio (77.83) were in accordance with those proposed by Bolton. The mean values for normal occlusion in this Brazilian sample were defined as: 2.45 mm for overbite; 1.92 mm for overjet; 1.01 mm for curve of Spee and 129.57° for interincisal angle. A statistically significant correlation was found between overjet and overbite.