American Board of Orthodontics (ABO) Practice Exam 2026 - Free Orthodontics Practice Questions and Study Guide

Question: 1 / 660

What is the role of chromium added to wires?

Strengthening the wire

Corrosion prevention

Chromium is primarily added to orthodontic wires to enhance their resistance to corrosion. This is particularly important in the context of orthodontics, as the oral environment can be quite hostile due to moisture, acidic conditions, and exposure to various dietary substances. The presence of chromium in the wire material forms a passive oxide layer on the surface, which helps protect the wire from corrosion and extends its lifespan.

While other properties such as strength may be relevant in wire performance, the main function of chromium in orthodontic applications focuses on ensuring durability and maintaining the integrity of the wire over time, which is critical for the success of orthodontic treatment. The use of chromium effectively keeps the wires functioning properly within the mouth, providing both aesthetic and functional outcomes for patients.

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Reducing weight

Enhancing conductivity

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