American Board of Orthodontics (ABO) Practice Exam

Question: 1 / 660

Chromium cobalt alloy wires typically contain what percentage of cobalt?

20%

30%

40%

Chromium cobalt alloy wires are used in orthodontics primarily for their properties, which include strength, stiffness, and resistance to corrosion. The typical composition of these wires includes a significant percentage of cobalt, generally around 40%. This level of cobalt is important as it contributes to the wire's mechanical properties and its ability to withstand the forces used during orthodontic treatment.

The presence of cobalt enhances the wire's overall performance, making it suitable for various clinical situations where durability and resilience are required. The other percentages listed, such as 20%, 30%, and 50%, are not representative of the standard compositions found in these alloys, as they either underestimate or overestimate the cobalt content, failing to provide the optimal balance of properties desired in orthodontic materials.

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50%

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