Amalgam As A Restorative Material

Amalgam As A Restorative Material

Write a short note on delayed expansion.
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Write a brief on delayed expansion.
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Write a short note on delayed expansion in silver amalgam.
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Answer briefly on the delayed expansion of silver alloy.
Answer:

“Common challenges in mastering amalgam effectively: FAQs provided”

Delayed expansion is observed in the case of zinc-containing low-copper or high-copper amalgam.

• If a zinc-containing low-copper or high-copper amalgam is contaminated by moisture during trituration or condensation a large expansion can take place. It usually starts after 3–5 days and may continue for months, reaching values greater than
• 400 mm (4%) this is known as delayed expansion or secondary expansion.

Silver Amalgam Fillings

“Understanding amalgam through FAQs: Composition, properties, and applications explained”

H₂O + Zn → ZnO + H₂ (gas)

• This hydrogen gas does not combine with the amalgam but collects within the restoration creating extreme internal pressure and expansion of the mass.
• This causes protrusion of the restoration out of the cavity, increased creep, increased microleakage, pitted surfaces and corrosion. Dental pain, recurrence of caries, and fracture of the restoration are also seen.

Dental Amalgam Restorations

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Types Of Dental Amalgam

Complications of Delayed Expansion:

• It leads to protrusion of the entire restoration out of the cavity.
• It increases the microleakage space around the restoration.

“Factors influencing success with amalgam knowledge: Q&A”

Amalgam In Cavity Filling

• It leads to the perforation in the restoration.
• It causes increased flow and creep
• It causes pain due to the pressure exerted by the expanding amalgam.