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Hyun-Kyung Kang 1 Article
Risk of dementia according to the severity of chronic periodontitis in Korea: a nationwide retrospective cohort study
Seon-Rye Kim, Minkook Son, Yu-Rin Kim, Hyun-Kyung Kang
Epidemiol Health. 2022;44:e2022077.   Published online September 21, 2022
DOI: https://doi.org/10.4178/epih.e2022077
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
We investigated the risk of dementia in older adults with chronic periodontitis according to the severity of periodontitis.
METHODS
Data on patients with chronic periodontitis were extracted from the National Health Insurance Service-Senior cohort database from 2002 to 2014. Among 52,728 subjects eligible for inclusion, 11,953 subjects had newly diagnosed mild chronic periodontitis (MCP), and 40,775 subjects had newly diagnosed severe chronic periodontitis (SCP). Two 1:1 propensity score matched cohorts were created with 8,624 patients each in the MCP and SCP groups. To analyze the risk of dementia, a Cox proportional-hazard model was used to calculate hazard ratios with 95% confidence intervals (CIs).
RESULTS
In the Kaplan-Meier curve, the disease-free probability was significantly lower in the SCP group than in the MCP group (p for log-rank=0.001). In the multivariable-adjusted model, the HR for the occurrence of dementia in the SCP group compared to the MCP group was 1.15 (95% CI, 1.04 to 1.27; p=0.009). A subgroup analysis revealed a significant association between dementia and the severity of periodontitis, especially in subjects who were male, aged ≥70 years, and had comorbidities.
CONCLUSIONS
Reducing the severity of chronic periodontitis can help to reduce the risk of dementia. Therefore, it is necessary to aggressively conduct early dementia-prevention programs for males under the age of 70 that include dental health to prevent the progression of periodontitis from mild to severe.
Summary
Korean summary
본 연구는 만성치주질환을 가진 노인의 만성치주질환 중등도에 따른 치매 발생위험 차이를 분석하였다. 그 결과, 만성치주질환 중등도가 높은 그룹에서 만성치주질환 중등도가 낮은 그룹에 비해 치매 발생위험이 높았으며, 특히, 남성과 70세 이상 그룹에서 유의한 차이가 있었다. 따라서 70세 이하 남성 노인을 대상으로 만성치주질환이 진행되지 않도록 효과적인 구강관리가 필요할 것이다.
Key Message
In this study, we confirmed that the severity of chronic periodontitis is related to the risk of dementia, so efforts for effective oral care will be needed.

Epidemiol Health : Epidemiology and Health