Characterization of the Subgingival Cultivable Microbiota in Patients with Different Stages of Periodontitis in Spain and Colombia. A Cross-Sectional Study.

The objective was to characterize and compare the subgingival microbiota in patients diagnosed according to the World Workshop on the Classification of Periodontal and Peri-Implant Diseases and Conditions 2018. For this cross-sectional study, Spanish and Colombian subjects (characterized as health/gingivitis, periodontitis in stages I-II or stages III-IV) were clinically assessed, and subgingival samples were taken and processed by culture. The comparisons among patients with periodontal status (and between countries) was made using Mann-Whitney, Kruskal-Wallis, ANOVA and chi-square tests. The final sample consisted of 167 subjects. and were more frequently detected in health/gingivitis and in periodontitis ( < 0.05). Higher total counts were observed in Colombia ( = 0.036). In Spain, significantly higher levels of and were observed, and of , , , , and spp. in Colombia ( < 0.001). was more prevalent in health/gingivitis and stage I-II periodontitis in Colombia, and in all periodontitis groups in Spain ( < 0.05). As conclusions, significant differences were detected in the microbiota between health/gingivitis and periodontitis, with minor differences between stages of periodontitis. Differences were also relevant between countries, with Colombia showing larger counts and variability of bacterial species.