1. Ro IK, Moon HS, Paik DI, Kim JB. A study on the percentage of extraction required by causes in Korea. J Korean Acad Oral Health. 1998; 22:183–194.
2. Lee SK, Lee KW, Chang KW. Reasons for extracted permanent teeth in Korean population. J Korean Acad Oral Health. 2001; 25:139–163.
3. Ha JE, Bae KH. Reasons for extraction of permanent teeth in Korea. J Korean Acad Oral Health. 2012; 36:32–37.
4. Health Insurance Review & Assessment Service. 2017 Statistics of Healthcare expenses: 17. Healthcare service reimbursement by the ranking of multi-frequency occurring diseases according to the list of three-character categories of Korea Standard Classification of Diseases: out-patients. Seoul: Ministry of Health and Wealfare;2017. p. 59–62.
5. Page RC. Gingivitis. J Clin Periodontol. 1986; 13:345–359.
6. Wara-aswapati N, Howell TH, Needleman HL, Karimbux N. Periodontitis in the child and adolescent. ASDC J Dent Child. 1999; 66:167–174.
7. Ministry of Health and Welfare. Korea National Children's Oral Health Survey in 2018. Sejong: Ministry of Health and Welfare;2018. p. 3p. 25–77. p. 124–127.
8. Page RC, Offenbacher S, Schroeder HE, Seymour GJ, Kornman KS. Advances in the pathogenesis of periodontitis: summary of developments, clinical implications and future directions. Periodontol 2000. 1997; 14:216–248.
9. Kwon YH, Kim BW, Kim SJ, Kim CK, Park JB, Suh JY, et al. Periodontology. Seoul: Koonja Publishing Co.;2001. p. 213–216.
10. Sabbah W, Tsakos G, Chandola T, Sheiham A, Watt RG. Social gradients in oral and general health. J Dent Res. 2007; 86:992–996.
11. Dalla Vecchia CF, Susin C, Rösing CK, Oppermann RV, Albandar JM. Overweight and obesity as risk indicators for periodontitis in adults. J Periodontol. 2005; 76:1721–1728.
12. World Health Organization. Oral health surveys: basic methods. 5th ed. Geneva: World Health Organization;2013. p. 35–56.
13. Broadbent JM, Thomson WM, Poulton R. Oral health beliefs in adolescence and oral health in young adulthood. J Dent Res. 2006; 85:339–343.
14. Ministry of Health and Welfare. Korea National Children's Oral Health Survey in 2015. Sejong: Ministry of Health and Welfare;2015. p. 80–91.
15. Loe H, Silness J. Periodontal disease in pregnancy. I. Prevalence and severity. Acta Odontol Scand. 1963; 21:533–551.
16. El Tantawi M, AlAgl A. Association between gingivitis severity and lifestyle habits in young Saudi Arabian males. East Mediterr Health J. 2018; 24:504–511.
17. Baiju RMP, Peter E, Nayar BR, Varughese JM, Varghese NO. Prevalence and predictors of early periodontal disease among adolescents. J Indian Soc Periodontol. 2019; 23:356–361.
18. Sharma U, Gill N, Gulati A, Passi S, Verma L, et al. Effect of oral health behavior and demographic variables on gingival health in 11-16-year-old school children in Chandigarh, India: A cross-sectional study. J Investig Clin Dent. 2019; 10:e12405. DOI:
10.1111/jicd.12405.
19. Pawlaczyk-Kamieńska T, Torlińska-Walkowiak N, Borysewicz-Lewicka M. The relationship between oral hygiene level and gingivitis in children. Adv Clin Exp Med. 2018; 27:1397–1401.
20. Taani DQ. Trends in oral hygiene, gingival status and dental caries experience in 13-14-year-old Jordanian school children between 1993 and 1999. Int Dent J. 2001; 51:447–450.
21. Ballouk MA, Dashash M. The gingival health status of 8-12 year-old children in Damascus city in Syria during the Syrian Crisis: a cross-sectional epidemiological oral health survey. BMC Res Notes. 2018; 11:887. DOI:
10.1186/s13104-018-3998-x.
22. Egelberg J. Permeability of the dento-gingival blood vessels. 3. Chronically inflamed gingivae. J Periodontal Res. 1966; 1:287–296.
23. Berhan Nordin EA, Shoaib LA, Mohd Yusof ZY, Manan NM, Othman SA. Oral health-related quality of life among 11-12 year old indigenous children in Malaysia. BMC Oral Health. 2019; 19:152. DOI:
10.1186/s12903-019-0833-2.
24. Kinane D. Causation and pathogenesis of periodontal disease. Periodontol 2000. 2001; 25:8–20.
25. Pattanaporn K, Navia JM. The relationship of dental calculus to caries, gingivitis, and selected salivary factors in 11- to 13-year-old children in Chiang Mai, Thailand. J Periodontol. 1998; 69:955–961.
26. Kukletova M, Izakovicova Holla L, Musilova K, Broukal Z, Kukla L. Relationship between gingivitis severity, caries experience and orthodontic anomalies in 13-15 year-old adolescents in Brno, Czech Republic. Community Dent Health. 2012; 29:179–183.