National Dental Examining Board of Canada (NDEB) Practice Exam

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Master your National Dental Examining Board of Canada (NDEB) exams with our comprehensive practice guide. Achieve excellence in your dental certification with expertly crafted questions and detailed explanations.

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GP may be softened or dissolved within a root canal by?

Water
Alcohol
Chlorhexidine
Xylene

The correct answer is: Xylene

Xylene is the correct answer because it is a solvent commonly used in endodontic procedures to soften or dissolve gutta-percha (GP). Water, alcohol, and chlorhexidine are not effective in softening or dissolving GP. Water has a tendency to cause GP to swell and become harder, while alcohol is not strong enough to dissolve GP. Chlorhexidine can delay the dissolution of GP, but is not suitable for completely dissolving it. Therefore, the most appropriate option is Xylene.