Dental India
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Subject: galvanic reaction 
Date: 2001-03-17 16:44:06 PST 

would gold crowns in a mouth that also has porcelain to metal crowns
cause a galvanic reaction? - Mrsralph 

Subject: Re: galvanic reaction 
Date: 2001-03-17 19:08:02 PST 

If the two metals have a different electrovoltaic potential.  I have
rarely found this to be a problem though.  Most frequently, it is when
two dissimilar metals are actually in contact with each other. - Steve

WHat if the two differing crowns were side by side and the porcelain started to
wear off?

Subject: Re: galvanic reaction 
Date: 2001-03-18 07:00:07 PST 

Generally, porcelain doesn't wear much in the mouth.  It does crack.  But
because the contact of a pfm crown is almost always in porcelain, there
wouldn't be any metal to metal contact.  Now, if the whole proximal surface
of the pfm crown sheared off and the crown wasn't repaired for enough time
for the teeth to drift together, there could be a problem.  But who's gonna
wait that long? - Steve