IL17A and periodontitis: Meanwhile, in the group of patients with periodontitis, significant correlations were found between: IL‐23R and IL‐23 [r = 0.469 (p = 0.021)]; as well as between IL‐17RA and IL‐17A [r = 0.713(p  < 0.001)] and with IL‐23 [r = 0.637 (p = 0.001)].