ABSTRACT
The purpose of this study was to determine the frequency of psychiatric disorders in patients with oral lichen planus. In this descriptive cross sectional study, all the patients with oral lichen planus referred to Oral Medicine Department of Mashhad dental school [from September to October 2003] were examined by a psychiatrist and according to the criteria set by DSM-IV-IR, the presence and type of psychiatric disorders were evaluated. The data were analysed by chi-square and t-tests. Among 56 patients examined, 54 [96/43%] subjects were diagnosed with at least one psychiatric disorder. 96.41% of subjects were categorized as anxiety disorders. In this study, majority of the patients, with oral lichen planus had psychiatric disorders. So psychiatric disorders could have a role in developing oral lichen planus