Infection Control · single question
Which of the following disinfectants is MOST appropriate for smooth counter surfaces in a dental office?
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Correct answer: C. Phenolic compound (phenol-based disinfectant)
Phenolic compounds (phenol-based disinfectants) are the recommended choice for smooth, hard environmental surfaces in dental offices. They have broad-spectrum activity against bacteria, viruses, and fungi. Glutaraldehyde is a high-level disinfectant/sterilant used for heat-sensitive instruments — too harsh and impractical for counter surfaces. Bleach (sodium hypochlorite) is effective but corrosive to some surfaces. Alcohol evaporates quickly and has limited residual activity.
- A. ❌ Glutaraldehyde is used for high-level disinfection of heat-sensitive semi-critical instruments — not routine surface disinfection.
- B. ❌ Ethyl/isopropyl alcohol is an intermediate-level disinfectant with good activity but limited residual effect and not ideal for large surface areas.
- C. ✅ CORRECT – Phenolic compounds are the preferred disinfectant for smooth environmental surfaces (counters, dental chair) in dental settings.
- D. ❌ Bleach (diluted sodium hypochlorite) is effective but can be corrosive and has a strong odor — phenolics are preferred for routine surfaces.
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