INBDE (Integrated National Board Dental Examination) Practice Exam

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What microbe is key in pregnancy gingivitis?

  1. P. gingivalis

  2. P. intermedia

  3. S. mutans

  4. Actinomyces

The correct answer is: P. intermedia

P. gingivalis and P. intermedia are both periodontal pathogens, but only P. intermedia has been specifically correlated with pregnancy gingivitis. S. mutans is associated with dental caries, not gingivitis. Actinomyces is a common commensal bacteria in the oral cavity and is not typically associated with disease. Therefore, the key microbe in pregnancy gingivitis is P. intermedia.