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Article Abstract
Objectives: This study aimed to evaluate the association between the frequency of dental scaling and the risk of stroke among individuals with moderate-to-severe periodontal diseases and verify the effect of regular dental scaling on stroke risk in this population.
Methods: In this retrospective study, 25,758 subjects with moderate-to-severe periodontal diseases were selected from the Korean National Health Insurance Service-National Health Screening Cohort database. Based on the frequency of dental scaling, the subjects were divided into three groups: regular, occasional, and infrequent. Restricted cubic splines were used to evaluate hazard ratios (HRs) with 95% confidence intervals (CIs) for stroke. Additionally, landmark analysis was conducted to strengthen the reliability of the results.
Results: There were 293, 111, and 38 stroke cases in the infrequent, occasional, and regular group, respectively. The adjusted HR for stroke in the regular group, compared to that in the infrequent group, was 0.40 (95% CI, 0.29 to 0.57). In the landmark analysis with follow-up after 1 year and after 2 years, the adjusted HR in the regular group compared to that in the infrequent group was 0.41 (95% CI, 0.28 to 0.60) and 0.50 (95% CI, 0.33 to 0.76), respectively.
Conclusions: Regular dental scaling was significantly associated with a reduced risk of stroke in patients with moderate-to-severe periodontal diseases. These findings may suggest a potential preventive role of dental scaling beyond oral health. Further studies are needed to explore the underlying biological mechanisms linking periodontal care to stroke prevention and to explore causal relationships between dental scaling and stroke risk.
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