INBDE (Integrated National Board Dental Examination) Practice Exam

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Primary Endodontic infection is mainly caused by what bacterium?

  1. Streptococcus

  2. Bacteroides

  3. E. coli

  4. Actinomyces

The correct answer is: Bacteroides

Endodontic infections involve the inflammation or infection of the soft inner tissue, or pulp, of the tooth. Bacteria are the main cause of these infections, with the most common being Bacteroides. Other bacteria such as Streptococcus, E. coli, and Actinomyces can also contribute to endodontic infections but are less common.

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