Background and Objectives: Oral lichen planus (OLP) is a common T-cell-mediated inflammatory oral mucosal disease. One of the complaints among OLP patients is xerostomia. However, the relationship between oral dryness and a decreased salivary-flow rate in these patients is not yet conclusive. So, we investigated oral dryness and the salivary-flow rate in OLP patients using various measurements. Material and Methods: Thirty OLP patients and 30 controls were included. The oral-dryness symptoms were collected using the Xerostomia Inventory (XI) and Bother Index (BI). The salivary-flow rate was measured using a Modified Schirmer Test (MST) and the spitting method. The clinical signs of dry mouth were determined by the clinical oral-dryness score (CODS). The Thongprasom score was used to evaluate the severity of OLP. The data were analyzed using the Mann-Whitney U test and Spearman’s rank correlation coefficient. Results: The XI score and BI score in the OLP group were significantly higher than in the control group. However, CODS, MST, the unstimulated salivary-flow rate, and the stimulated salivary-flow rate were not significantly different between the two groups. There was no correlation between oral dryness and the salivary-flow rate in OLP patients. The severity of OLP was also not correlated to oral dryness and the salivary-flow rate. Conclusion: OLP patients had more complaints about mouth dryness than the controls. However, the salivary-flow rates between the two groups were not different. Additionally, the severity of OLP was not related to dry mouth or the salivary-flow rate. The possible reasons for oral dryness among people with OLP require further investigation.
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