Chromium Alloys

Chromium Alloys

Classify the denture base materials. How far does cobalt chromium alloy fulfill the requirements for a partial denture base?
Answer:

The material which is used for forming the denture base is called “Denture base material”.

Classification of Denture Base Materials:

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Cobalt-chromium Alloy is used as a Denture Base Material:

Cobalt-chromium alloy is the base metal alloy that is used for denture bases.

• They possess high strength: Their excellent corrosion resistance, especially at high temperatures, makes them useful for several applications.
• They are also known as “satellites” because of their shiny, star-like appearance.

Read And Learn More: Dental Materials Question And Answers

Properties Of Denture Base Material:

The Cobalt-chromium alloys have replaced type IV gold alloys, especially for making cast partial RPDs, because of their lower cost and good mechanical properties:

• The density is half that of gold alloys, so they are lighter in weight.
• Being a much larger structure, the lighter weight aids in retention in the mouth.

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Dental Chromium Alloys

• They are twice as stiff as gold alloys, which aids in making the casting thinner.
• This is important, especially in the palate region where having a thin palatal portion makes it more comfortable to the patients.
• The high stiffness prevents the frame from bending under occlusal forces.
• They have good fatigue resistance. This property is important for clasps.
• Clasps have to flex when inserted or removed from the mouth.
• If they do not have good fatigue resistance, they break after repeated insertion and removal (less than gold).
• Less expensive than gold alloy, a large structure would require more metal therefore the cost of the alloy should be low.
• Tarnish and corrosion resistant because chromium forms a layer of chromium oxide on the surface of alloys and prevents tarnish and corrosion.

Medical-Grade Chromium Alloys

• This is called “passivation”.

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