Incidence of antibiotic resistance in microorganisms isolated from root canals

Acute pulpal-alveolar cellulitis syndrome. II. Clinical assessment of antibiotic effectiveness against microbes isolates from intact teeth

Ten antibiotics were comprehensively screened for effectiveness against 105 microbes, specifically isolated from seventy-eight teeth involved with acute pulpal-alveolar cellulitis. On the basis of effectiveness and compatibility, erythromycin was regarded as the drug of choice for initial therapy. Streptococci were the predominant class of microbes isolated; enterococci were the most resistant. No resistance was noted wit erythromycin; 52 percent resistance was obtained with clindamycin. Tetracycline was the most effective of the common drugs for aerobic gram-negative rods. Polyantibiotic resistance was noted among microbes of all types. A clinical perspective in drug therapy for acute oral infection is discussed.

Klebsiella pneumoniae in endodontic therapy. Report of a case

A 48-year-old man underwent endodontic treatment of the lower left central incisor. In the course of treatment two acute exacerbations occurred. Penicillin therapy was initiated at the time of the first exacerbation. It was ineffective, and a culture of the purulent exudate was taken at the time of the second acute response. The causative organism was Klebsiella pneumoniae, which was found to be sensitive to tetracyclines. After tetracycline therapy, endodontic therapy was completed. Healing has been uneventful.