INBDE (Integrated National Board Dental Examination) Practice Exam

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P. intermedia, T. denticola, P. gingivalis, AA feed on amino acids and are considered what type of colonizers?

  1. Early

  2. Late

  3. Secondary

  4. Tertiary

The correct answer is: Late

These particular bacteria are considered "late" colonizers, meaning that they appear later in the process of biofilm formation compared to early or secondary colonizing bacteria. Early colonizers are the first to attach to the tooth surface and predominantly use sucrose as a source of energy. Secondary colonizers typically arrive later and feed on the byproducts of sucrose metabolism. Tertiary colonizers are the last to arrive and are often associated with periodontitis, as they feed on tissue and host proteins instead of primary or secondary products. Late colonizers, such as P. intermedia, T. denticola, P. gingivalis, and AA, feed on amino acids and are known for their ability to cause periodontitis.

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