Anaerobic bacteria in dentoalveolar abscesses

Area of Science:

• Oral microbiology
• Infectious diseases
• Dental surgery

Background:

• Orofacial abscesses of dental origin are common infections.
• Antibiotic pre-treatment can alter the microbial landscape of these abscesses.
• Understanding the bacteriology is crucial for effective treatment.

Purpose of the Study:

• To determine the bacterial species present in orofacial abscesses.
• To investigate the impact of prior antibiotic use on bacteriology.
• To assess antibiotic susceptibility patterns of isolated bacteria.

Main Methods:

• Bacteriological analysis of 40 orofacial abscess specimens.
• Isolation and identification of aerobic, facultative anaerobic, and obligate anaerobic bacteria.
• Antibiotic susceptibility testing of predominant isolates.

Main Results:

• Bacteria were isolated from 38 of 40 specimens.
• Aerobic/facultative anaerobic bacteria (21 cases) and obligate anaerobic bacteria (17 cases) were identified.
• Polymicrobial growth occurred in 11 cases, with an average of 2.1 species per specimen.
• Gram-positive aerobic organisms, including Staphylococcus epidermidis, Streptococci (group A), and Staphylococcus aureus, predominated.
• Among obligate anaerobes, Gram-positive peptostreptococci and peptococci were most frequent.
• Ampicillin showed activity against aerobes, and cefoxitin against anaerobes.

Conclusions:

• Gram-positive aerobic bacteria are the predominant isolates in dental orofacial abscesses.
• Obligate anaerobic bacteria, particularly Gram-positive species, are also significant contributors.
• Antibiotic susceptibility testing reveals ampicillin and cefoxitin as potentially effective treatments for aerobic and anaerobic components, respectively.