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Restorative & Materials · single question

Which of the following is correct about the function of saliva?

  1. It binds to calcium and phosphate ions to reduce them
  2. It decreases calculus build-up
  3. It impedes bacterial growth
  4. It binds to and dissolves hydroxyapatite
Show answer and explanation

Correct answer: C. It impedes bacterial growth

  • A. Saliva is SUPERSATURATED with calcium and phosphate and DELIVERS these ions to REMINERALIZE enamel — it does not bind them away.
  • B. Saliva actually contributes minerals that can favor calculus FORMATION (mineralization of plaque); it does not decrease calculus build-up.
  • C. Correct. Saliva has antimicrobial functions — lysozyme, lactoferrin, salivary peroxidase, and secretory IgA all inhibit/impede bacterial growth (and are 'cytotoxic' to cariogenic bacteria like S. mutans). This is the keyed answer on the source's official item.
  • D. Saliva (via the pellicle and mineral ions) protects and remineralizes hydroxyapatite; it does not dissolve it.

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