ABSTRACT
This study aimed to present a reliable way to determine the arbitrary relation using the divine proportion method. The study relied on statistical analysis between different conventional ways to put the patient at rest versus the use of divine proportion method. One hundred completely edentulous patients were selected to determine the correct rest vertical dimension using the divine proportion method versus three other conventional methods which are the lip moisten and the relax, swallowing and phonetics through the letter [M]. There was marked statistical significant difference between the recorded rest vertical dimension between the divine proportion method and the other three conventional methods while on comparing the conventional methods to each other the results showed no statistical significant difference. The results of this study suggested the use of more than one method for determination of rest vertical dimension to assure proper measurement. Since the divine proportion method depends on fixed and unchanged anatomical landmarks occupying the middle third of the face, it should be the method of choice for measuring the rest vertical dimension