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Endodontics · single question

Which property of calcium hydroxide makes it effective as an endodontic intracanal medicament?

  1. Stimulates osteoclast activity
  2. Permanently seals the apex
  3. Forms secondary dentin bridge only
  4. Bactericidal due to high alkaline pH (~12.5)
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Correct answer: D. Bactericidal due to high alkaline pH (~12.5)

Ca(OH)2 has pH ~12.5 — highly alkaline, creating unfavorable environment for bacterial survival (most bacteria cannot survive pH>10). Also stimulates reparative dentin in pulp capping. Does NOT permanently seal the apex.

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