Comparative examination for the determination of the individual contour-curve from the incisors and from the premolar region.

The interindividual comparison of guiding contours on the base of incisors and molars shows a relation of protrusive incisal and molar contours. In practical application when no sagittal incisal curvature is obtainable the extraction from the molar region is to be valued as the first correct step to determine the individual constant "a". This allows the individual, biomechanically required reconstruction of the frontal vault of guidance.