Sand blasting zirconium affects the cte??!!!

[user name]

So, If you type: 'zirconia regeneration firing' into the google machine, quite a few hits come up. Even studies have been made (attached link)... I am no scientist, but if it helps to prevent the porcelain from chipping, I don't mind doing it.

https://pdfs.semanticscholar.org/e78e/b2cda363989daa138e4245fdd59b54df3b83.pdf

I guess when you search for it, you get results because the Goolge algorithm knows your history. Poor CHL. Hit one key and it wants to autofill with robot porn.

 

[CoolHandLuke]

i tried adding Fake, Myth and false. found no results over 10 pages that do not include those terms.

 

[Contraluz]

i tried adding Fake, Myth and false

I guess google filters them out, in wake of the recent "fake news" and manipulation issues... .

 

[FASTFNGR]

It

I heard that sand blasting zirconium affects the cte of it . So it's prohibited .
But why and how can the cte be affected by sand blasting??

It does change the cte but nothing that you should be worried about. It is not prohibited, as a matter of fact some companies ask you to sandblast the surface before you put your glaze or stains before that.

 

[Patrick Coon]

Hi everyone, sorry it has taken me so long to get back to you on this like I said I would, I've been traveling a lot in the last few weeks, along with trying to find the paper I thought I had gotten from someone years ago.

As it turns out, I could not find the paper. Ended up at the company last week for some projects and stopped in to our ceramic engineers office to talk zirconia and specifically to get this report. So here's the part where i eat a little crow. . .



I asked about getting the literature on the effect on CTE that blasting/grinding has on the CTE of zirconia, and got the deer in the headlights look from him. He then went on to explain that blasting/grinding does not have an effect on the CTE. It does cause the spontaneous crystal phase transformation and build stress in the zirconia which can have an effect on the way that layering ceramic bonds to the framework. The Regeneration Firing that we have in our furnaces and IFUs, (and I knew this correctly) does not get hot enough to reverse the crystal phase transformation (that would have to go to 1370C or higher),but does help to relieve the stress that is built up helping to prevent fractures of the layering ceramic.

I was told by a technician that is no longer with us that the CTE changes, and must have convinced myself that I had seen that papers confirming it. I'm sorry for the confusion, but definitely willing to admit when I'm wrong.

 

[2thm8kr]

I was told by a technician that is no longer with us that the CTE changes

Glad you bounced that joker out of there.

 

[rkm rdt]

Glad you bounced that joker out of there.

Patrick runs a tight ship.

 

[Patrick Coon]

Patrick runs a tight ship.

I'm just a sailor, not the Captain!

 

[rkm rdt]

 

[ps2thtec]

 

[rkm rdt]

 

[Patrick Coon]

Good Buffett sailing song.

Better Buffett sailing songs!



or



or

 

[Adi]

Hi everyone, sorry it has taken me so long to get back to you on this like I said I would, I've been traveling a lot in the last few weeks, along with trying to find the paper I thought I had gotten from someone years ago.

As it turns out, I could not find the paper. Ended up at the company last week for some projects and stopped in to our ceramic engineers office to talk zirconia and specifically to get this report. So here's the part where i eat a little crow. . .



I asked about getting the literature on the effect on CTE that blasting/grinding has on the CTE of zirconia, and got the deer in the headlights look from him. He then went on to explain that blasting/grinding does not have an effect on the CTE. It does cause the spontaneous crystal phase transformation and build stress in the zirconia which can have an effect on the way that layering ceramic bonds to the framework. The Regeneration Firing that we have in our furnaces and IFUs, (and I knew this correctly) does not get hot enough to reverse the crystal phase transformation (that would have to go to 1370C or higher),but does help to relieve the stress that is built up helping to prevent fractures of the layering ceramic.

I was told by a technician that is no longer with us that the CTE changes, and must have convinced myself that I had seen that papers confirming it. I'm sorry for the confusion, but definitely willing to admit when I'm wrong.

Thanks for your concern and your time

 

[Eric Hill]

From what I understand, sandblasting can reverse some ill-effects of grinding by making the surface smoother and therefore minimizing microfractures. So, as long as you keep the pressure low it may even make zirconia that was finished very slightly stronger.

 

[K M]

New High-Translucent Cubic-Phase–Containing Zirconia: Clinical and Laboratory Considerations and the Effect of Air Abrasion on Strength

www.aegisdentalnetwork.com