Avaliação do espaço adicional requerido no perímetro do arco inferior para o nivelamento da curva de Spee

Abstract

OBJETIVO: determinar o perímetro de arco adicional necessário para o nivelamento da curva de Spee através de uma técnica laboratorial em modelos de estudo. MÉTODOS: foram utilizados 70 modelos inferiores nos quais se mediu a profundidade da curva de Spee e o perímetro do arco (de segundo molar a segundo molar). Nos mesmos modelos, após a simulação do nivelamento da curva de Spee, o perímetro de arco foi novamente avaliado, mantendo sua forma e comprimento. RESULTADOS: foi confirmada a correlação entre a profundidade da curva de Spee e o perímetro de arco adicional, sendo deduzida a fórmula [Paa = 0,21 CSmax - 0,04]. CONCLUSÃO: a técnica proposta permitiu, através da avaliação do perímetro de arco com curva de Spee nivelada, a determinação do espaço disponível para o alinhamento dentário.

Assessment of Long-Term Stability ofLeveling of theCurve of Spee after Orthodontic Treatment in Mesocephalic Patients -A Pilot Study

“…A prefabricated acrylic plate, resting on three points of the lower model worked as a reference plane (Figure 1 If a tooth prevented the contact of the acrylic plate with any of these three points, the lower surface of the plate was abraded up to all three contacts were simultaneously obtained. The thickness of the acrylic plate (1,61mm) was discounted from the measure found because the caliper and the cast were in contact with opposite surfaces of the plate [15].…”

Measurement of Spee curve in individuals with temporomandibular disorders: a cross-sectional study

“…This reference plane was obtained by supporting an acrylic plate on three points of the mandibular cast: the distalbuccal cusps of the right and left second molars and the most evident incisal edges of the inferior central incisors. If a tooth prevented the contact of the acrylic plate with one of the points, the lower surface of the plate was worn until the three contact points were obtained [5,6].…”

“…The distance between the acrylic plate and the lowest buccal cusp tips in each hemi-arch was then measured with the aid of a digital caliper (Kingtools ® 150 mm, São Paulo/SP) placed on the acrylic plate, passing through a perforation (figures 1 and 2). Because the caliper and the mandibular cast was in contact with the opposed surfaces of the acrylic plate, the thickness was subtracted (1.7 mm) from the measurement found to obtain the cusp deepness [5,6].…”