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Endodontics · single question

What concentration of NaOCl is used for intracanal irrigation during root canal treatment?

  1. 10% — maximum antibacterial effect
  2. 1–2% — moderate efficacy
  3. 3–6% (optimal ~4%) — best balance of efficacy and safety
  4. 0.5% — minimal cytotoxicity
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Correct answer: C. 3–6% (optimal ~4%) — best balance of efficacy and safety

NaOCl is used at 0.5–6%. Source states 3–6% with 4% cited as optimal ('siendo mejor 4%'). Clinically 2.5–5.25% is most common. Higher concentrations = greater efficacy but more cytotoxicity. 5.25% is the classic concentration in North American endodontics.
  • A. 10% is dangerously cytotoxic — NOT used clinically.
  • B. 1–2% — moderate effectiveness; less commonly used than 2.5–5.25%.
  • C. CORRECT. 3–6%, best ~4% per source. Balance of antimicrobial efficacy and tissue-dissolving properties.
  • D. 0.5% — least effective; insufficient tissue dissolution and antibacterial effect.

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