Abstract
Studies using graphic tracing devices have yielded conflicting results concerning mandibular movements. The purpose of this study was to determine whether graphic tracings could be affected by styli positions in relationship to changes in vertical dimension, by the shape of central bearing surfaces and by tooth contacts and functional movements. A pantograph was used on patients to study the effect of these variables. The results of this study indicate that several variables can affect graphic tracing of mandibular movements. The effects of these variables were shown and suggestions were made to reduce the inconsistencies found in studies using graphic tracings. Research criteria were suggested for conducting and reporting the results of studies of mandibular movements.
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