69 Differences in perceived intra-oral dryness MAIN CONCLUSIONS The present study shows that the RODI questionnaire was able to identify differences between perceived intra-oral dryness in various dry-mouth patient groups. Dry-mouth patients differed with regard to the regions they experienced as the most and least dry. Controls and SS patients experienced the posterior palate as the most dry, and Low Med and High Med patients the anterior tongue. The RODI scores for the various intra-oral regions differed significantly among dry-mouth patients. SS and SS + High Med patients had the highest RODI scores for all intra-oral regions, while controls and Low Med patients had the lowest. These findings suggest that the RODI questionnaire might be a useful additional diagnostic tool for dry-mouth diagnostics, as it may be used to discriminate between potential causes of oral dryness in patients. With the help of this questionnaire, SS patients could be easily differentiated from controls, Low Med, and High Med patients. The RODI might play an important role in early dry-mouth diagnostics as the floor of the mouth, and the anterior and posterior tongue of the RODI may play important roles in dry-mouth perception. 3
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