Essential for the model analysis in order to be able to transfer the course of the alveolar ridge into the area of the posteriors to the outer edge of the edentulous lower model. The position of the largest masticating unit is determined on the basis of the alveolar ridge; this is usually the first lower molar. This procedure has been known since GYSI and was adopted by GERBER as well as for the model analysis for full dentures (TiF).