The Prevalence of Periodontitis Is Increased in Psoriasis and Linked to Its Inverse Subtype

: Periodontitis and psoriasis are suggested to be co-occurring, chronic inflammatory conditions with overlapping characteristics. However, respective evidence is rare and data on risk factors of periodontitis in psoriasis patients are minimal. The aim of this study was to expand the evidence of psoriasis-associated periodontitis and establish a potential risk profile for periodontitis. In total, data from 209 exacerbated psoriasis patients were retrospectively analyzed on recordings of periodontitis and compared with those of 91 patients with chronic spontaneous urticaria (CSU). Analysis showed a significantly increased prevalence of periodontitis in psoriasis compared to CSU patients with an odds ratio of 3.76 (95% CI = 1.60-10.27, p = 0.001). Within the psoriatic subtypes, the presence of the inverse type (affecting intertriginous body areas) was strongly linked to periodontitis with an odds ratio of 5.11 (95% CI = 1.36-20.38, p = 0.006). These results are enlarging the evidence for psoriasis-associated periodontitis and identify a link between the inverse type of psoriasis and periodontitis.