Re: Re: Expansion in amalgam

[Guest guest]

Many thanks Anu.Ahmed.

From:

Anu Arora <dr.anuarora@...>;

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Subject:

Re: Expansion in amalgam

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Mon, Mar 5, 2012 11:32:41 AM

silver increses the expansion on setting due to gamma 1 phase (Ag2Hg3).Volume of gamma 1 is greater than Ag/Hg independently.{phillips dental material book UG}zinc causes delayed expansion if amalgm mix is contaminated witjh moisture during manipulation

REGARDSAnu

[Guest guest]

Thanks,Megha

From:

Anu Arora <dr.anuarora@...>;

To:

< >;

Subject:

Re: Expansion in amalgam

Sent:

Mon, Mar 5, 2012 11:32:41 AM

silver increses the expansion on setting due to gamma 1 phase (Ag2Hg3).Volume of gamma 1 is greater than Ag/Hg independently.{phillips dental material book UG}zinc causes delayed expansion if amalgm mix is contaminated witjh moisture during manipulation

REGARDSAnu

[Guest guest]

Thanks balaji.Ahmed.

From:

balaji <balajidbaste@...>;

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Re: Expansion in amalgam

Sent:

Mon, Mar 5, 2012 4:31:10 PM

its not silver but zinc in amalgam that leads to delayed expansion.

moisture contamination during trituration/condensation of amalgam leads to the formation on zinc oxide and hydrogen gs,which is released nd gives rise to the symptoms seen on the 3-5day after the cavity is filled.

silver in amalgam is the major constituent forming the bulk but does not cause expansion

hope this helps