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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What type of die stone is used for a PFM crown with a PVS impression?

  1. Type II

  2. Type III

  3. Type IV

  4. Type V

The correct answer is: Type IV

The correct type of die stone for a PFM crown with a PVS impression is Type IV. Type II is too weak and will not withstand the heat of the porcelain firing process. Type III is too strong and may cause inaccuracies in the final crown fit. Type V is typically used for implant cases, so it is not the appropriate choice. Type IV is specifically designed for use with PVS impressions and provides the optimal balance of strength and accuracy required for a PFM crown.