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SALIVARY AND SERUM CORTISOL IN PATIENTS WITH PERIODONTAL DISEASE AND ORAL LICHEN PLANUS Positive correlation between stress and cortisol, stress and clinical parameters, and cortisol levels and patients with chronic periodontitis had been observed by Goyal S et al. (30). At the same time Shah et all, observed a positive correlation between psychological factors and salivary cortisol levels in the OLP patients (34). Giardini and co-workers, indicated an association between OLP and anxiety, but salivary cortisol levels did not differ between patients with OLP and control group (33). In our study, salivary and serum levels of cortisol were statistically increased in OLP patients versus healthy subjects. Until now there are no studies regarding the serum level of cortisol at patients with OLP. The World Health Organisation (WHO) classifies OLP as a “potentially malignant disorder” and suggests that OLP patients should be under close monitoring. OLP patients present higher levels of anxiety, depression because there are concern about the malignant transformation of this oral diseases (37). Chronic inflammation leads to cortisol release that counteracts inflammatory reactions and even immunological functions, so this stress hormone can be involved in the pathogenesis of OLP and periodontal disease. In conclusion psychological stress may influence the progression of these two oral diseases. Acknowledgements This study was supported by the Sectorial Operational Programme Human Programme Human Resources Development (SOP HRD), financed from the European Social Fund and by the Romanian Government under the contract number POSDRU/6/1.5/S/S17. Bibliography 1. Page RC, Kornman KS. The pathogenesis of human periodontitis: an introduction. Periodontol 2000.1997;14(1):9–11. 2. Ridgeway EE. Periodontal disease: diagnosis and management. J Am Acad Nurse Pract. 2000;12(3):79-84. 3. Miricescu D, Totan A, Calenic B, Mocanu B, Didilescu A, Mohora M, Spinu T, Greabu M. Salivary biomarkers: Relationship between oxidative stress and alveolar bone loss in chronic periodontitis. Acta Odonto Scand. 2014;72(1):42-47. 4. Su H, Gornitsky M, Velly AM, Yu H, Benarroch M, Schipper HM. Salivary DNA, lipid, and protein oxidation in nonsmokers with periodontal disease. Free Radic Biol Med. 2009;46(7):914-921. 5. Takane M, Sugano N, Ezawa T, Uchiyama T, Ito K. A marker of oxidative stress in saliva: association with periodontally-involved teeth of a hopeless prognosis. J Otal Sci. 2005;47(1):53-57. 6. D’Aiuto F, Nibali L, Parkar K, Patel, Suvan J, Donos N. Oxidative stress, systemic inflammation and severe periodontitis. J Dent Res. 2010; 89(11):1241-1246. 7. Miricescu D, Greabu M, Totan A, Mohora M, Didilescu A, Mitrea N, Arsene A, Spinu T, Totan C, Rădulescu R. Oxidative Stress – A possible link between systemic and oral diseases. Farmacia. 2011;6(3):329-337. 8. Mannem S, Chava VK. The effect of stress on periodontitis: A clinic-biochemical study. J Indian Soc Periodontol. 2012;16(3):365-369. 9. Akcali A, Huck O, Tenenbaum H, Davideau JL, Buduneli N. Periodontal diseases and stress: a brief review. J Oral Rehabil. 2013;40(1):60-68. STOMA.EDUJ (2015) 2 (1) 10. Totan A, Miricescu D, Parlatescu I, Mohora M, Greabu M. New possible salivary and serum biomarkers in oral lichen planus. Biotech Histochem. 2015;3:1-7. 11. Sugerman PB, Savage NW, Walsh LJ, Zhao ZZ, Zhou XJ, Khan A, Seymour GJ, Bigby M. The pathogen