National Dental Examining Board of Canada (NDEB) Practice Exam

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How should GP cones be disinfected prior to obturation?

  1. Autoclave

  2. 5.25% sodium hypochlorite

  3. 70% ethanol

  4. Dry heat

The correct answer is: 5.25% sodium hypochlorite

Sodium hypochlorite is the most commonly used disinfectant for GP cones prior to obturation. Autoclaving, while effective, can lead to warping or melting of the cones. Ethanol and dry heat are also not recommended as they may not fully disinfect the cones. Therefore, B is the best option for disinfecting GP cones prior to obturation.

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