Australian Dental Council (ADC) Test 2026 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 1390

What is the recommended depth of undercut for Cobalt Chrome's retentive arm clasp?

0.50mm

0.75mm

0.25mm

The recommended depth of undercut for a cobalt-chrome retentive arm clasp is typically around 0.25mm. This specific measurement is crucial for the effective retention and function of the clasp within a removable partial denture.

A depth of 0.25mm is sufficient to provide adequate resistance against dislodgment forces while avoiding excessive occlusal interference and ensuring that the clasp engages the undercut adequately. It strikes a balance between retention and comfort, which is vital for the patient’s satisfaction.

In practical scenarios, deeper undercuts can lead to increased stress on the dental tissues and discomfort for the patient, while shallower undercuts may not provide the necessary retention. Therefore, the 0.25mm guideline is strategically chosen to optimize both retention and patient comfort in cobalt-chrome clasps.

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