National Dental Assisting Examining Board (NDAEB) Practice Exam

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Prepare for the National Dental Assisting Exam with comprehensive quiz questions, including multiple choice and detailed explanations. Equip yourself for success!

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What are the most common noble metals used for crown and bridge work?

Silver and nickel
Gold and palladium
Gold, palladium, and platinum
Platinum and chromium

The correct answer is: Gold, palladium, and platinum

The most common noble metals used for crown and bridge work include gold, palladium, and platinum. These metals are categorized as noble due to their excellent resistance to oxidation and corrosion, which contributes to their longevity and suitability for dental restorations. Gold is widely used in dentistry for its biocompatibility, durability, and ability to be polished to a high sheen, which minimizes plaque accumulation. Palladium is often included in dental alloys due to its strength and resistance to tarnish, and it can enhance the mechanical properties of the alloy. Platinum, while more expensive, also contributes to the overall stability and durability of the dental restorations. The combination of these metals in various proportions helps create alloys that possess desirable properties such as strength, workability, and aesthetic appeal. These features are crucial in dental applications since crowns and bridges need to withstand the mechanical forces of chewing and resist wear over time. Thus, the choice of gold, palladium, and platinum aligns with the requirements for effective and reliable restorative materials in dental practices.