When to use phosphoric acid vs polyacrylic acid in etching?

[customx]

Can someone explain why sometimes it's better to use phosphoric acid and other times polyacrylic acid when etching? Thank you

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[Saddleshoes]

Can someone explain why sometimes it's better to use phosphoric acid and other times polyacrylic acid when etching? Thank you

It's been a long time since I was held responsible for this kind of chemistry judgements but here is my best guesses...
#1 The polyacrylic molecule is too big to come in close contact with the mineral component of the enamel and would therefore not be effective in "dissolving" out the non-organic portions of the enamel.
#2 Polyacrylic acid by its nature is more likely to bond itself to other chemicals then to "eat" other chemicals. So it makes for a bad etching solution.

 

[customx]

I know that phosphoric acid is more commonly used, but I saw the polyacrylic acid used on occasion at the dentist I shadowed. Could it be used to etch composite or on top of a porcelain crown?

 

[ILLchief]

i've only seen phosphoric acid used in etching (product called Uni-Etch... believe its 35%?) but who knows haha

 

[Screwtape]

We only use poly acrylic for glass ionomer materials.

 

[ktran17]

Hhaha, you should send an email to 3M 😀

 

[customx]

We only use poly acrylic for glass ionomer materials.

Thanks!

 

[AnalysisWheeler]

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