Correlação da curva de spee com overbite, overjet e padrão facial / Spee curve correlation with overbite, overjet and facial pattern

RESUMO

Objetivou-se com o presente estudo verificar a relação entre a profundidade da curva de Spee superior e inferior com o overjet, overbite e o padrão facial. Quarenta e três modelos e radiografias cefalométricas laterais iniciais foram selecionados de pacientes do arquivo do Curso de Especialização de Ortodontia da Faculdade de Odontologia da UERJ, pós-surto de crescimento, com dentição permanente completa e apresentando overjet de 1 a 3 mm. Os modelos foram digitalizados e a profundidade máxima da curva de Spee superior e inferior, o overjet e o overbite foram calculados, utilizando-se o programa 3Shape Ortho Analyser. O padrão facial foi determinado a partir do ângulo SN.GoGn. As associações da curva de Spee superior e inferior com overbite, overjet e padrão facial foram avaliadas através do teste de correlação de Pearson. Encontrou-se associação da profundidade da curva de Spee inferior com o overjet e com a curva de Spee superior. Não houve significância estatística na correlação da curva de Spee inferior com o overbite e padrão facial, nem da curva de Spee superior com o overbite, com o overjet ou com o ângulo do plano mandibular, sugerindo que a curva de Spee inferior acentuada está mais frequentemente associada ao overjet aumentado.(AU)

ABSTRACT

The aim of this study was to verify the relationship between the depth of the lower and upper curves of Spee with overjet, overbite and facial pattern. Forty-three initial casts and lateral cephalometric radiographs were selected from the archives of the Graduate Program in Orthodontics of Rio de Janeiro State University. All patients were postpubertal, with permanent dentition and presenting an overjet varying from 1 to 3 mm. The cast models were scanned and the maximum depth of the upper and lower curve of Spee, the overjet and the overbite were calculated using the 3Shape Ortho Analyzer software. The facial pattern was determined from the SN.GoGn angle. The associations of the upper and lower curve of Spee with overbite, overjet and facial pattern were assessed using the Pearson correlation test. An association was found between the depth of the lower curve of Spee with the overjet and with the upper curve of Spee. There was no correlation of the lower curve of Spee with the overbite and facial pattern, neither between the upper curve of Spee with the overbite, overjet or the mandibular plane angle, suggesting that a marked lower curve of Spee is more frequently associated with increased overjet. (AU)