Identifying the risk factors for tooth loss

tooth loss periodontitis
Photo: Tanita Seton, Dental Stock Photos

With currently available treatment options for periodontitis often proving inadequate, there is a pressing need to understand the beginning and development of the disease better. Now researchers from Okayama University, Japan, reveal insightful findings that could provide new directions to the treatment strategies for periodontitis and resulting tooth loss.

The physiology of an individual directly affects the development of infection. Genetic differences among hosts contribute to differences in susceptibility to specific pathogens and the chance of developing certain diseases. 

In their study—published in the International Journal of Environment and Public Health Research—the team focused on understanding the microbes associated with the presence of periodontitis and the host genetic factors that might facilitate the development of the conditions. 

“Several studies on periodontitis have shown that the development of the disease is associated with the nature of the oral microbiome as well as with genetic ‘polymorphism,’ the most common type of genetic variation among people,” Dr Naoki Toyama said.

“However, there is no study that simultaneously assesses the importance of these two risk factors in developing the disease.”

Accordingly, the team conducted a cross-sectional study in which they genotypically analysed 14,539 participants and conducted saliva sampling of 385 individuals. They finally retained 22 individuals for statistical analysis, and based on their periodontal status, divided them into ‘periodontitis’ and ‘control’ groups.

The team found that the ‘β-diversity’ of the microbes, which refers to the ratio between regional and local species diversity, was significantly different between the periodontitis and control groups. Furthermore, they attributed the presence of the bacteria species, P. gingivalis and the bacterial families, Lactobacillaceae and Desulfobulbaceae, to periodontitis. 

In contrast, they found no relation between genetic polymorphism and periodontitis. 

Taking these inferences into account, the team concluded that our oral microbiome affects the status of periodontitis more than our genes.

“The fact that the prevalence of periodontitis is associated with the members of the microbiome rather than the genetic identity of the individual would motivate clinicians to pay more attention to microbiome composition than to host factors in the routine work of periodontal examination, and design customised treatment strategy for periodontitis,” Dr Toyama said.

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