2. Genco RJ, Borgnakke WS. Risk factors for periodontal disease. Periodontol 2000 2013;62:59-94.
3. Grossi SG, Genco RJ, Machtei EE, Ho AW, Koch G, Dunford R, et al. Assessment of risk for periodontal disease. II. Risk indicators for alveolar bone loss. J Periodontol 1995;66:23-9.
4. Haffajee AD, Socransky SS. Relationship of cigarette smoking to attachment level profiles. J Clin Periodontol 2001;28:283-95.
5. Nelson RG, Shlossman M, Budding LM, Pettitt DJ, Saad MF, Genco RJ, et al. Periodontal disease and NIDDM in Pima Indians. Diabetes Care 1990;13:836-40.
7. Jepsen S, Suvan J, Deschner J. The association of periodontal diseases with metabolic syndrome and obesity. Periodontol 2000 2020;83:125-53.
8. Hilgert JB, Hugo FN, Bandeira DR, Bozzetti MC. Stress, cortisol, and periodontitis in a population aged 50 years and over. J Dent Res 2006;85:324-8.
9. Shaddox LM, Morford LA, Nibali L. Periodontal health and disease: the contribution of genetics. Periodontol 2000 2021;85:161-81.
10. Wu L, Zhang SQ, Zhao L, Ren ZH, Hu CY. Global, regional, and national burden of periodontitis from 1990 to 2019: results from the global burden of disease study 2019. J Periodontol 2022;93:1445-54.
12. Sejnowski TJ, Destexhe A. Why do we sleep? Brain Res 2000;886:208-23.
13. Irwin MR. Sleep and inflammation: partners in sickness and in health. Nat Rev Immunol 2019;19:702-15.
15. Maggio M, Colizzi E, Fisichella A, Valenti G, Ceresini G, Dall’Aglio E, et al. Stress hormones, sleep deprivation and cognition in older adults. Maturitas 2013;76:22-44.
16. Suri JC, Sen MK, Adhikari T. Epidemiology of sleep disorders in the adult population of Delhi: a questionnaire based study. Indian J Sleep Med 2008;3:128-37.
18. Tonetti MS, Greenwell H, Kornman KS. Staging and grading of periodontitis: framework and proposal of a new classification and case definition. J Periodontol 2018;89(Suppl 1):S159-72.
19. Buysse DJ, Reynolds CF 3rd, Monk TH, Berman SR, Kupfer DJ. The Pittsburgh Sleep Quality Index: a new instrument for psychiatric practice and research. Psychiatry Res 1989;28:193-213.
21. Page RC, Kornman KS. The pathogenesis of human periodontitis: an introduction. Periodontol 2000 1997;14:9-11.
22. Cochran DL. Inflammation and bone loss in periodontal disease. J Periodontol 2008;79(8 Suppl):1569-76.
24. Lorton D, Lubahn CL, Estus C, Millar BA, Carter JL, Wood CA, et al. Bidirectional communication between the brain and the immune system: implications for physiological sleep and disorders with disrupted sleep. Neuroimmunomodulation 2006;13:357-74.
27. Backhaus J, Junghanns K, Broocks A, Riemann D, Hohagen F. Test-retest reliability and validity of the Pittsburgh Sleep Quality Index in primary insomnia. J Psychosom Res 2002;53:737-40.
28. Sitasuwan T, Bussaratid S, Ruttanaumpawan P, Chotinaiwattarakul W. Reliability and validity of the Thai version of the Pittsburgh Sleep Quality Index. J Med Assoc Thai 2014;97(Suppl 3):S57-67.
29. Alqaderi H, Goodson JM, Agaku I. Association between sleep and severe periodontitis in a nationally representative adult US population. J Periodontol 2020;91:767-74.
30. Han DH, Kim MS, Kim S, Yoo JW, Shen JJ. Sleep time and duration are associated with periodontitis in a representative sample of Koreans. J Periodontol 2022;93:210-9.
32. Romandini M, Gioco G, Perfetti G, Deli G, Staderini E, Laforì A. The association between periodontitis and sleep duration. J Clin Periodontol 2017;44:490-501.
33. Iwasaki M, Usui M, Ariyoshi W, Nakashima K, Nagai-Yoshioka Y, Inoue M, et al. Sleep duration and severe periodontitis in middle-aged Japanese workers. J Clin Periodontol 2022;49:59-66.
34. Karaaslan F, Dikilitaş A. The association between stage-grade of periodontitis and sleep quality and oral health-related quality of life. J Periodontol 2019;90:1133-41.