INBDE (Integrated National Board Dental Examination) Practice Exam

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>60% noble, 40% at least gold is classified as?

high noble
noble
base metal
non-noble

The correct answer is: high noble

A restoration that consists of over 60% noble metals and at least 40% gold is classified as "high noble." This category is reserved for the highest quality of metal alloys used in dental restorations due to their superior biocompatibility, corrosion resistance, and strength. Noble metals typically include elements like gold, platinum, and palladium, and they are highly valued for their non-reactive nature within the oral environment. Therefore, when a restoration contains such a high percentage of noble metals and gold, it falls into the high noble category. The other options are not correct: - "Noble" alone typically refers to restorations with a lower noble metal content than high noble. - "Base metal" refers to alloys with a predominance of non-noble metals like nickel and chromium. - "Non-noble" is a broader category encompassing materials with little to no noble metal content.