Changes in Oral Subgingival Microbial Distribution and Community Structure in CP-T2DM Patients Before and After Combined Periodontal-Endodontic Treatment.

Objective: This study aims to investigate the oral subgingival microbial community in patients with chronic periodontitis with type 2 diabetes mellitus (CP-T2DM) before and after combined periodontal-endodontic treatment.
Methods: A retrospective selection of 88 patients with CP-T2DM (CP-T2DM group) treated at our hospital from May 2021 to June 2022 was conducted. Additionally, 90 patients with CP were selected as the control group (CP group). The study compared the distribution of oral subgingival microbial communities between the two groups and analyzed differences in the distribution of oral subgingival microbial communities in patients with different clinical characteristics within the CP-T2DM group, both before and after treatment.
Results: The CP-T2DM group showed lower relative abundances of Cilia and Streptococcus while higher relative abundances of Tannerella and Citrobacter (P < .05) compared to the CP group. Furthermore, the relative abundance of Cilia was found to be negatively correlated with fasting blood glucose (FBG) and HbA1c, whereas the relative abundance of Citrobacter was positively correlated with FBG and HbA1c (P < .05).
Conclusions: Significant differences were observed in the oral subgingival microbial communities distribution between CP-T2DM and CP patients. The relative abundance of ciliate and citrate bacteria was found to be associated with the blood glucose level of patients.