Association between caries and periodontal diseases in a sample of employed adults in Spain: a cross-sectional study

Objectives To study whether there is an association between caries and periodontitis in a representative sample from employed Spanish adults. Materials and methods This cross-sectional study is part of a wide epidemiological survey (WORALTH, Workers' ORAL healTH). Oral examination was carried out in 5130 dentate subjects. Periodontal status was assessed by clinical attachment level (CAL) and Community Periodontal Index (CPI) in index teeth. For caries, all teeth were classified as healthy, decayed (D), filled (F), or missed (M), and DMFT index and prevalence of cavitated caries were calculated. ANOVA, Chi-square tests, and regression models were performed. Results DMFT increased with CAL values, being 7.8, 9.6, and 10.5 for CAL 0-3 mm, 4-5 mm, and >= 6 mm, respectively. After adjustment for confounders, subjects with CPI >= 3 showed an odds ratio of 1.6 (95% confidence interval (CI) [1.3; 1.8]; p < 0.001) for presenting cavitated caries, and patients with CAL >= 6 mm had 0.8 higher mean DMFT (95% CI [0.2; 1.5]; p = 0.015), and 0.3 higher mean DFR (95% CI [0.2; 0.5]; p < 0.001) than those with CAL < 6 mm. Conclusions The presence of CAL >= 6 m mm was associated with an increased DMFT and DFR, and the presence of CPI >= 3 was associated with a higher prevalence of cavitated caries in this representative sample. Clinical relevance There is a tendency to present higher prevalence of dental caries among patients with periodontitis. Therefore, common preventive measures in dentistry, such as oral hygiene practices, should ideally include actions aimed to prevent at the same time dental caries and periodontitis.