California Registered Dental Assistant (RDA) Written Practice Exam

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What is the most commonly used irrigation material during root canal therapy?

  1. Normal saline

  2. Diluted Sodium Hypochlorite

  3. Chlorhexidine

  4. Hydrogen Peroxide

The correct answer is: Diluted Sodium Hypochlorite

During root canal therapy, the most commonly used irrigation material is diluted sodium hypochlorite. Normal saline (option A) is not commonly used for irrigation as it has limited antimicrobial properties. Chlorhexidine (option C) is not commonly used as an irrigation material because it can cause stains and discoloration of the teeth. Hydrogen peroxide (option D) is a commonly used irrigation material, but is not the most commonly used. Diluted sodium hypochlorite (option B) is the most commonly used material as it has strong antimicrobial properties and can dissolve organic tissue.

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