Objective: Periodontitis and peri-implantitis are oral infectious-inflammatory diseases that share similarities in their pathology and etiology. Our objective was to characterize the single-site subgingival and submucosal microbiomes of implant-rehabilitated, partially dentate Chinese subjects (n = 18) presenting with both periodontitis and peri-implantitis.
Materials and methods:Subgingival/submucosal plaque samples were collected from four clinically distinct sites in each subject: peri-implantitis submucosa (DI), periodontal pocket (DT), clinically healthy (unaffected) peri-implant submucosa (HI), and clinically healthy (unaffected) subgingival sulcus (HT). The bacterial microbiota present was analyzed using Illumina MiSeq sequencing.Results: Twenty-six phyla and 5,726 operational taxonomic units (OTUs, 97% sequence similarity cutoff) were identified. Firmicutes, Proteobacteria, Fusobacteria, Bacteroidetes, Actinobacteria, Synergistetes, TM7, and Spirochaetes comprised 99.6% of the total reads detected. Bacterial communities within the DI, DT, HI, and HT sites shared high levels of taxonomic similarity. Thirty-one "core species" were present in >90% sites, with Streptococcus infantis/mitis/oralis (HMT-070/HMT-071/ HMT-638/HMT-677) and Fusobacterium sp. HMT-203/HMT-698 being particularly prevalent and abundant. Beta-diversity analyses (PERMANOVA test, weighted UniFrac) revealed the largest variance in the microbiota was at the subject level (46%), followed by periodontal health status (4%). Differing sets of OTUs were associated with periodontitis and peri-implantitis sites, respectively. This included putative "periodontopathogens," such as Prevotella, Porphyromonas, Tannerella, Bacteroidetes [G-5], and Treponema spp. Interaction network analysis identified several putative patterns underlying dysbiosis in periodontitis/peri-implantitis sites. Conclusions: Species (OTU) composition of the periodontal and peri-implant microbiota varied widely between subjects. The inter-subject variations in subgingival/ submucosal microbiome composition outweighed differences observed between implant vs. tooth sites, or between diseased vs. healthy (unaffected) peri-implant/ periodontal sites. | 761 YU et al. vincentii ("Fusobacterium Genus Probe 2"). Our data also correlate with that reported by Maruyama et al. (2014), who found that F. nucleatum, S. oralis, and Neisseria subflava, were abundant in both periodontitis and peri-implantitis lesions sampled from the same Japanese individuals. The respective compositions of the "core" microbiota reported in several other high-throughput TA B L E 3 Bacterial taxa present at higher abundances in the four respective clinical sites a Clinically healthy (unaffected) periodontal sites (HT) Periodontitis sites (DT) Halomonas sp. (OTU0) (core) Tannerella forsythia HMT-613 (OTU15) Escherichia coli HMT-574 (OTU17) Cardiobacterium valvalum HMT-540 (OTU33) Streptococcus mutans HMT-686 (OTU27) Capnocytophaga granulosa (OTU32) Veillonella dispar HMT-160 (OTU1252) Bacteroidales [G-2] sp. HMT-274...