Microbiome Signatures in Periodontitis: plaque vs. saliva

This study investigates the differences in microbiome profiles between pooled plaque samples from the full mouth and saliva in patients with stage III, grade C periodontitis. Both plaque and saliva are commonly used to study oral microbiota, but their specific characteristics had not been fully understood. The research included three systemically healthy, non-smoking patients who underwent nonsurgical periodontal treatment. Before treatment, plaque and saliva samples were collected and analyzed using advanced shotgun sequencing techniques, revealing a wide range of microbial species, including bacteria, archaea, viruses, and protists. The results showed that plaque samples had a more consistent microbial composition, predominantly featuring key periodontal pathogens such as Porphyromonas gingivalis and Tannerella forsythia. In contrast, saliva displayed a more varied microbial distribution, with the most abundant species making up a smaller proportion of the total microbiome. This study is significant as it underscores the distinct microbiota profiles between plaque and saliva, emphasizing the need for careful selection of the source material for microbiome analysis. Understanding these differences is essential for enhancing the accuracy and relevance of microbiome research in the context of periodontal disease