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interface question

 
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Pcus



Joined: 17 May 2005
Posts: 434
Location: toronto

PostPosted: Tue May 17, 2011 9:40 pm    Post subject: interface question Reply with quote

Just took a course with Byong Sah with Bisco. He was mentioning that when you receive HFL acid etched procelain to be bonded back from the lab it should be cleaned with phosphoric acid and then silanated right away before try in. Once you try in, clean with alcholol, dry and apply bond resin. His studies found that if you try first, then use silane, the bond strengths drop ( his nunbers were from 41.5 to 28.9 did not get the units)

John, does interface have this same property? has this even been tested..

Also has anyone heard of this Z Prime Plus, It is a Zirconia Primer.

Speaking of Zirconia he also said

do not grind it
light sandblast is OK (27-50micron 20-50psi)
use as fine a diamond if adjustments are needed
and do not clean it with phosphoric acid, it reduces retention
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john kanca



Joined: 14 May 2005
Posts: 6342

PostPosted: Wed May 18, 2011 9:56 am    Post subject: Reply with quote

There is a cleaner coming from Ultradent that will be highly valuable here to clean the porcelain after try-in.

I don't agree about the data. Ours is different. I am fine trying it in first and then silanating, at least with Interface.

We've done some testing with that Z prime. It's ok, but nothing super. Zirconia is tough.

I do agree with sandblasting zirconia. I cannot believe that H3PO4 would have any effect on zirconia at all.
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Pcus



Joined: 17 May 2005
Posts: 434
Location: toronto

PostPosted: Thu May 19, 2011 11:04 am    Post subject: Reply with quote

he showed some SEM's of the surface. the phosphoric acid makes the surface less mechanically retentive, somewhat smoother looking) at least it looked that way on the slides, you could see the difference
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scottie



Joined: 21 May 2005
Posts: 360
Location: Albuquerque NM

PostPosted: Fri May 20, 2011 6:53 pm    Post subject: Reply with quote

While we're on the subject of Interface, I had another question about it.
When I read the original instructions, after you added the second liquid you waited till the bubble disappeared.
Now my assistant tells me you don't have to wait for that to happen. She puts the second liquid in, agitates it pretty good, and then hands it to me.
Are we using it correctly?
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d2thdr



Joined: 16 Oct 2005
Posts: 402
Location: Cincinnati, Ohio

PostPosted: Sat May 21, 2011 7:24 am    Post subject: Reply with quote

Confused

Scottie, when I have asked John questions about material viability, his response is that the dissolving of #2 after deposit into #1, is a sign that the material is doing what it should.

If it doesn't, it's not still a good batch.

If you don't wait, you don't know.
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john kanca



Joined: 14 May 2005
Posts: 6342

PostPosted: Sat May 21, 2011 8:53 am    Post subject: Reply with quote

scottie wrote:
While we're on the subject of Interface, I had another question about it.
When I read the original instructions, after you added the second liquid you waited till the bubble disappeared.
Now my assistant tells me you don't have to wait for that to happen. She puts the second liquid in, agitates it pretty good, and then hands it to me.
Are we using it correctly?


No offense, Scottie, but from what knowledge base does your assistant draw? Is she a materials guru?

The answer to your question is no.
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john kanca



Joined: 14 May 2005
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PostPosted: Sat May 21, 2011 8:55 am    Post subject: Reply with quote

Pcus wrote:
he showed some SEM's of the surface. the phosphoric acid makes the surface less mechanically retentive, somewhat smoother looking) at least it looked that way on the slides, you could see the difference


I do not question what you saw, but I do not accept the premise. Zirconia is so non-reactive that no acid is going to have any effect on it at all. The only possibility I see is that something in the Bisco H3PO4 gel could be contaminating the zirconia.
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scottie



Joined: 21 May 2005
Posts: 360
Location: Albuquerque NM

PostPosted: Sat May 21, 2011 11:42 pm    Post subject: Reply with quote

Thanks John
She said she had read the instructions and gave me the impression they were newer instructions. I will correct this and go back to the way we were using the Interface as per the original instructions, which I knew. We will wait until the bubble disperses in the first liquid.
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john kanca



Joined: 14 May 2005
Posts: 6342

PostPosted: Sun May 22, 2011 6:33 am    Post subject: Reply with quote

scottie wrote:
Thanks John
She said she had read the instructions and gave me the impression they were newer instructions. I will correct this and go back to the way we were using the Interface as per the original instructions, which I knew. We will wait until the bubble disperses in the first liquid.


That will give you the best result, Scottie.
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