1. Lopez AD, Shibuya K, Rao C, Mathers CD, Hansell AL, Held LS, et al. Chronic obstructive pulmonary disease: current burden and future projections. Eur Respir J. 2006; 27:397–412.
Article
2. Kim DS, Kim YS, Jung KS, Chang JH, Lim CM, Lee JH, et al. Prevalence of chronic obstructive pulmonary disease in Korea: a population-based spirometry survey. Am J Respir Crit Care Med. 2005; 172:842–847.
3. Mathers CD, Loncar D. Projections of global mortality and burden of disease from 2002 to 2030. PLoS Med. 2006; 3:e442.
Article
4. Lee GD, Doh SR, Lee JS, Noh CS, Lee SD, Kim DS, et al. Trends and factors in health care utilization of patients with chronic obstructive pulmonary disease in Korea: A nationwide survey from 1990 through 2008. Tuberc Respir Dis. 2011; 70:307–314.
Article
5. Lee GY. Review: Epidemiology of chronic obstructive pulmonary disease. Tuberc Respir Dis. 2003; 55:333–343.
6. Rabe KF, Hurd S, Anzueto A, Barnes PJ, Buist SA, Calverley P, et al. Global strategy for the diagnosis, management, and prevention of chronic obstructive pulmonary disease: GOLD executive summary. Am J Respir Crit Care Med. 2007; 176:532–555.
7. Seymour GJ, Ford PJ, Cullinan MP, Leishman S, Yamazaki K. Relationship between periodontal infections and systemic disease. Clin Microbiol Infect. 2007; 13(Suppl 4):S3–10.
Article
8. Wang Z, Zhou X, Zhang J, Zhang L, Song Y, Hu FB, et al. Periodontal health, oral health behaviours, and chronic obstructive pulmonary disease. J Clin Periodontol. 2009; 36:750–755.
Article
9. Sharma N, Shamsuddin H. Association between respiratory disease in hospitalized patients and periodontal disease: a cross-sectional study. J Periodontol. 2011; 82:1155–1160.
Article
10. Terpenning MS. The relationship between infections and chronic respiratory diseases: an overview. Ann Periodontol. 2001; 6:66–70.
Article
11. Hayes C, Sparrow D, Cohen M, Vokonas PS, Garcia RI. The association between alveolar bone loss and pulmonary function: the VA Dental Longitudinal Study. Ann Periodontol. 1998; 3:257–261.
Article
12. Scannapieco FA, Ho AW. Potential associations between chronic respiratory disease and periodontal disease: analysis of National Health and Nutrition Examination Survey III. J Periodontol. 2001; 72:50–56.
Article
13. Liu Z, Zhang W, Zhang J, Zhou X, Zhang L, Song Y, et al. Oral hygiene, periodontal health and chronic obstructive pulmonary disease exacerbations. J Clin Periodontol. 2012; 39:45–52.
Article
14. Didilescu AC, Skaug N, Marica C, Didilescu C. Respiratory pathogens in dental plaque of hospitalized patients with chronic lung diseases. Clin Oral Investig. 2005; 9:141–147.
Article
15. Ministry of Health and Welfare. 2009 Korean National Oral Health Survey. Seoul: Ministry of Health and Welfare;2009. p. 7–12.
16. WHO. Oral health surveys: basic methods. 4th ed. Geneva: World Health Organization;1997. p. 16–52.
17. Viegi G, Scognamiglio A, Baldacci S, Pistelli F, Carrozzi L. Epidemiology of chronic obstructive pulmonary disease (COPD). Respiration. 2001; 68:4–19.
Article
18. Garcia RI, Henshaw MM, Krall EA. Relationship between periodontal disease and systemic health. Periodontol 2000. 2001; 25:21–36.
Article
19. Prasanna SJ. Causal relationship between periodontitis and chronic obstructive pulmonary disease. J Indian Soc Periodontol. 2011; 15:359–365.
Article
20. Vestbo J, Hurd SS, Agusti AG, Jones PW, Vogelmeier C, Anzueto A, et al. Global Strategy for the diagnosis, management and prevention of chronic obstructive pulmonary disease: GOLD Executive Summary. Am J Respir Crit Care Med. 2013; 187:347–365.
21. Deo V, Bhongade ML, Ansari S, Chavan RS. Periodontitis as a potential risk factor for chronic obstructive pulmonary disease: a retrospective study. Indian J Dent Res. 2009; 20:466–470.
Article
22. Scannapieco FA, Wang B, Shiau HJ. Oral bacteria and respiratory infection: effects on respiratory pathogen adhesion and epithelial cell proinflammatory cytokine production. Ann Periodontol. 2001; 6:78–86.
Article
23. Wan ES, DeMeo DL, Hersh CP, Shapiro SD, Rosiello RA, Sama SR, et al. Clinical predictors of frequent exacerbations in subjects with severe chronic obstructive pulmonary disease (COPD). Respir Med. 2011; 105:588–594.
Article
24. Katancik JA, Kritchevsky S, Weyant RJ, Corby P, Bretz W, Crapo RO, et al. Periodontitis and airway obstruction. J Periodontol. 2005; 76:2161–2167.
Article
25. Hyman JJ, Reid BC. Cigarette smoking, periodontal disease: and chronic obstructive pulmonary disease. J Periodontol. 2004; 75:9–15.
Article