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 is the most important property to consider in selecting an alloy for PFM bridge?

Weight
Color
Elastic modulus
Melting point

The correct answer is: Elastic modulus

When selecting an alloy for a PFM (porcelain-fused-to-metal) bridge, the most important property to consider is the elastic modulus. This refers to the stiffness of the material, and it is crucial because the alloy needs to have a similar elasticity to the natural teeth in order to avoid added stress on the teeth and potential damage. Option A (weight) and D (melting point) may also be considered in the selection process, but they are not as critical as the elastic modulus. Option B (color) is not relevant because the porcelain layer is responsible for the color and appearance of the bridge, not the alloy. Therefore, it is important to prioritize the elastic modulus over the other properties.