[Comparative studies on 4 methods for the measurement of the sagittal position of the mandible in the edentulous patient with special reference to "functional relation"].

Four known registration procedures (Gerber, Schreinemakers, Fehr and adduction point) were used to determine repeatedly the mandibular positions on 24 edentulous patients. The sagittal positions of the mandible obtained as well as the reproducibility of the method was tested. The sagittal difference was of the order of +/- 0.5 mm. The reproducibility of relationship determinations depends on several factors, which are described. The closely approximating results of 384 relationship determinations with 768 measurements point to the fact that a slight scatter depends mainly on the experience of the attendant, who is responsible for a suitable of relationship determination.