Question:
Since most teeth whitening systems use hydrogen peroxide, wouldn't it
be effective to simple buy some 30% hp, cut it with water down to
say, 10-15% and use it as a rinse, holding it in the mouth for some
set amount of time?
Of course tooth/gum sensitivity would likely result, but that happens
anyway with the gels used in trays, right?
Answer:
It isnt clear hydrogenium.The concentration is important .The best is
10%.Its the rule -- if you are using higher % the result is faster but it
lasts shorter.
The home -used systems could be dangerous becouse of glum.Thats the reson so
the bleaching tray is very important
Why get rushed to the ER? Don't the gels contain 15-20% hydrogen
peroxide (or carbamide peroxide)? And they're left in for hours,
sometimes overnight.
We used to use Super Oxal (35% H2O2) mixed with sodium perborate to do
internal bleaching. Very nasty, corrosive stuff. You shouldn't assume
that because 15% carbamyl peroxide is relatively safe (btw, it is quite
irritating to soft tissues) that 15% hydrogen peroxide is similarly safe.
overnight ?! It makes hypersensitivity.Dont do that.
2 hours a day 10 % Its enough.
Home made bleaching stuff seems to me dangerous and the way of application
even more
I don't know when I last did any non-vital bleaching. My results
weren't good enough to overcome my fear of apical resorption if my seal
isn't perfect.
I use Geristore after etching and bonding. It's surely hell to get thru
if you decide to put in a post afterwards, but I think a GIC product is
mandatory to seal the canal. FWIW, I asked the Local Endo Guy about
this, and he said there are no statistics on the incidence of external
root resorption induced by walking or chairside bleaching, but the
incidence would be quite low in any case.
Also, FWIW, one thing you can try is to refer your patient to a local
dentist who has a hard tissue laser and have them take out all the
stained stuff. Then you can fill the access cavity and do an external
bleach with a tray or in-house. If you have access to Endo-Cal, you can
put some of that in the access cavity and seal it in with GIC and let
that work for a few weeks. After all, that is just CaO-Ca(OH)2 and I
don't think it will cause the same problem as H2O2 does.
