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Os metodos, mais divulgados na literatura, para a avaliacao da relacao ânteroposterior entre a maxila e a mandibula, receberam consideracoes. Alguns utilizavam pontos cefalometricos em estruturas anatomicas longe da regiao avaliada (ângulo ANB), outros como a avaliacao Wits apresentavam instabilidade e variacao do plano oclusal e, o plano MM° Bisector ou a avaliacao ProjUSP que utilizavam muitos pontos cefalometricos e uma complexa tecnica de tracado cefalometrico. Para facilitar esta avaliacao, propusemos a utilizacao do plano PmA, com projecao ortogonal apenas do ponto B, para que somente com 3 pontos fosse possivel alcancar uma confiavel avaliacao da relacao ântero-posterior entre a maxila e a mandibula. Para tanto a correlacao entre a avaliacao (PlanUSP) e os ângulos ANB e FABA e as avaliacoes Wits e Tpi foi pesquisada em uma amostra com 85 individuos, sendo 47 Classe I e 38 Classe II de Angle. Com a analise estatistica obtivemos significativa correlacao entre a avaliacao PlanUSP e as outras medidas e avaliacoes pesquisadas, tanto para individuos Classe I como Classe II de Angle. Conclusao: a avaliacao PlanUSP mostrou ser um metodo com significativa correlacao e homogeneidade com as medidas dos ângulos ANB e FABA e com os metodos Witse TPi, na avaliacao da relacao ântero-posterior entre a maxila e a mandibula. The most published methods, for the anteroposterior jaw relationship appraisal, have got consideration. Some of them used cephalometric points in the anatomical structures far from the evaluated area (ANB angle), others as the Wits appraisal got instability and alteration of the occlusal plane and some others like MMo Bisector plane and ProjUSP evaluation used many cephalometric points and a complex cephalometric tracing technique. The aim of this paper is making easier the assessment of the anteroposterior jaw relationship by using the PmA plane with perpendicular drawing from just point B, with only a 3 point way, that may get possible a reliable anteroposterior jaw relationship assessment. The correlation among the PlanUSP appraisal and the ANB and FABA angles and the Wits and TPi appraisals was researched with a sample of 85 subjects (47 Class I and 38 Class II). The statistical analysis showed a significant correlation between the PlanUSP appraisal and the others measurements and evaluations researched, as if Class I or Class II subjects. Conclusion: The PlanUSP appraisal showed to be a method with a significant correlation and homogeneity with the ANB and FABA angles measurements and the Wits and TPi methods for the anteroposterior jaw relationship assessments.

Proposta de um plano cefalométrico na avaliação da relação ântero-posterior entre a maxila e a mandíbula