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Re: whitestrips unhealthy?

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Re: whitestrips unhealthy?

Dr Steve27 Jun 2005 20:27
I am trying to think of what oxidation reaction will result in a purple
color.  I need help from someone more recent on chemical reactions.  Cu
would turn green (with a slight bluish tint),  What would add red to create
purple?  Mg?  Cannot remember for the life of me.

Anyway, any reaction on the surface of amalgam from a oxidizer like H2O2
should vary by the degree of polish/oxidation on the amalgam and by the
mineral content of the particular alloy.

Could the purple color simply be a gelling agent of flavoring agent in the
bleaching product?

Signature

~+--~+--~+--~+--~+--
Stephen [What's a Temporary?], D.D.S.
Michigan, USA
....................................................

This posting is intended for informational or conversational purposes only.
Always seek the opinion of a licensed dental professional before acting on
the advice or opinion expressed here.  Only a dentist who has examined you
in person can diagnose your problems and make decisions which will affect
your health.
......................

>> I have done lots of bleaching in my day.  I still have the old Almore
>> Monarch II bleaching instrument from the days of using superoxol heated
[quoted text clipped - 21 lines]
> Occasionally a slight purple coloration may appear in the tray following
> bleaching adjacent to amalgam fillings.

Matt27 Jun 2005 19:37
> I have done lots of bleaching in my day.  I still have the old Almore
> Monarch II bleaching instrument from the days of using superoxol heated with
> this device.  [Want to buy it?  :-) ]   Many vital and non-vital bleaching
> cases.  Even more cases done with custom fitted trays and take home
> chemistry.  I have never seen amalgam discolor from it.

Hmmm ... I thought it was common knowledge ...

Maybe I erred---maybe it only happens with carbamide peroxide and older
amalgam:

http://www.ultradent.com/products/products.php?act=faq&fid=1&pid=4#45

Why does OPALESCENCE change to a dark purple/black color when it comes
in contact with amalgam?
The dark purple coloration that may appear in the tray following
bleaching adjacent to older amalgams is normal and has proven
inconsequential, based on years of clinical use. No adverse/detrimental
effect on the amalgam restorations has been experienced. It has been
theorized that the zinc in old amalgams may be the cause of the
discoloration.

http://www1.umn.edu/dental/courses/dent_6806fall02/paper9/paper9.html

Occasionally a slight purple coloration may appear in the tray following
bleaching adjacent to amalgam fillings.

Dr Steve27 Jun 2005 18:33
I have done lots of bleaching in my day.  I still have the old Almore
Monarch II bleaching instrument from the days of using superoxol heated with
this device.  [Want to buy it?  :-) ]   Many vital and non-vital bleaching
cases.  Even more cases done with custom fitted trays and take home
chemistry.  I have never seen amalgam discolor from it.

Signature

~+--~+--~+--~+--~+--
Stephen [What's a Temporary?], D.D.S.
Michigan, USA
....................................................

This posting is intended for informational or conversational purposes only.
Always seek the opinion of a licensed dental professional before acting on
the advice or opinion expressed here.  Only a dentist who has examined you
in person can diagnose your problems and make decisions which will affect
your health.
......................

>> I have never noticed that effect.
>
[quoted text clipped - 3 lines]
> Maybe there isn't much of an effect from whitestrips since they are OTC
> and used only in the front anyway.

Matt27 Jun 2005 17:57
> I have never noticed that effect.

You have never seen a purple reaction product when peroxide touches
fillings?

Maybe there isn't much of an effect from whitestrips since they are OTC
and used only in the front anyway.

Dr Steve27 Jun 2005 15:45
I have never noticed that effect.

Signature

~+--~+--~+--~+--~+--
Stephen [What's a Temporary?], D.D.S.
Michigan, USA
....................................................

This posting is intended for informational or conversational purposes only.
Always seek the opinion of a licensed dental professional before acting on
the advice or opinion expressed here.  Only a dentist who has examined you
in person can diagnose your problems and make decisions which will affect
your health.
......................

>
>>     Can anyone shed some light on Crest Whitestrips, where the
>> active ingredient is Hydrogen Peroxide; Is it harmful/unhealthy on
>> the teeth?
>
> I believe that hydrogen peroxide corrodes amalgam fillings.

Matt26 Jun 2005 23:26
>     Can anyone shed some light on Crest Whitestrips, where the
> active ingredient is Hydrogen Peroxide; Is it harmful/unhealthy on
> the teeth?

I believe that hydrogen peroxide corrodes amalgam fillings.

Emil23 Jun 2005 15:36
Hi,

   Can anyone shed some light on Crest Whitestrips, where the
active ingredient is Hydrogen Peroxide; Is it harmful/unhealthy on
the teeth?

Thanks.

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