Peri-implantitis-associated methanogens: a preliminary report.

Area of Science:

• Oral microbiology
• Periodontal disease research
• Implant dentistry

Background:

• Methanogens are known to be present in periodontitis.
• Their role in peri-implantitis, an inflammation around dental implants, is not well understood.
• This study investigates the presence and prevalence of methanogens in peri-implantitis.

Purpose of the Study:

• To determine if methanogens are more prevalent in peri-implantitis lesions compared to healthy peri-implant sites.
• To identify specific methanogen species associated with peri-implantitis.
• To assess the potential pathogenic role of methanogens in peri-implantitis.

Main Methods:

• Collected 30 peri-implantitis and 28 control samples from 28 patients.
• Utilized PCR-sequencing of the 16S rRNA gene for broad screening.
• Employed real-time quantitative PCR targeting mcrA genes for confirmation and load assessment.

Main Results:

• Methanogen communities, primarily Methanobrevibacter oralis, were detected in 51% of samples.
• Prevalence of Methanobrevibacter oralis and Methanobrevibacter massiliense did not significantly differ between peri-implantitis and control groups.
• Methanogen load also showed no significant difference between diseased and healthy sites.

Conclusions:

• The prevalence and load of methanogens are similar in peri-implantitis lesions and healthy peri-implant sites.
• Methanogens are likely part of the normal commensal flora of the oral cavity.
• Current data do not support a specific pathogenic role for methanogens in peri-implantitis.