Objectives: To assess the prevalence of systemic pathologies associated with periodontal diseases to determine multimorbidity patterns and risk factors for periodontal care. Methods: A single-center cross-sectional study analyzed patient records from 1 January 2019 to 31 December 2021 at the Department of Periodontology, part of the Dental Service of a hospital-based dental school in Lyon, France. The anonymized data included patient-reported medical history (questionnaire) and billing for periodontal procedures. Data were compared between patients in the Department of Periodontology and from Other Departments of the Dental Service. The association between clinically relevant pathologies, as defined as multimorbidity, and admission in the Department of Periodontology were assessed with logistic regression. Prevalences between the Department of Periodontology and the Other Departments of the Dental Service were compared with chi-squared tests. Relationship among pathologies was described through correlation analysis. Statistical analyses were conducted using R software with a significance level set at p < 0.05. Results: This study included records of 20,945 patients in the Dental Service with 1205 periodontal procedures performed in the Department of Periodontology. Patients admitted for periodontal care were older and mostly female (p-value < 0.001). The most frequent systemic pathologies were hypertension and diabetes in the Department of Periodontology. Hypertension associated with diabetes was the most frequent multimorbidity pattern, while the most frequent triad of multimorbidity was hypertension/diabetes/cardiac rhythm disorders. Patients with diabetes had a 1.49 times higher likelihood of admission to the Department of Periodontology (OR = 1.49 [1.20; 1.86]), with age also being a significant risk factor but with a smaller effect size (OR = 1.02 [1.01; 1.03]). Conclusions: Within the limitations of this study, hypertension, diabetes, cardiac rhythm disorders, and chronic renal insufficiency were identified as prevalent multimorbidity in the Department of Periodontology. Multimorbidity including diabetes seems to constitute a risk factor requiring periodontal care.
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