Here is a new report on zirconia

Travis · 11-24-2008, 02:48 PM

The lastest CRA (Clinical Research Associates) report on zirconia restorations.

sixonice · 11-25-2008, 12:41 AM

Thanks for posting this report Travis. This is not the best news for zirconia folks. Dr. Gordon Christiansen (founder & CEO of CRA-Clinical Research Associates) has many dentist "followers". It is amazing that when he gives the "thumbs-up"... how a product or material can prosper & when he gives a less than ideal evaluation....that it can cause a big ripple. I personally do not think this is to much to worry about, although I have talked to some friends about this report already. We all will probably receive a few calls from dentists. We just have to be prepared to help the dentist understand it is a very good material WHEN PROCESSED CORRECTLY. Looking at the pictures of the failures, it is very clear that these units were overlayered, underfired or ground on. The delaminations I believe were caused in part to perhaps no liner being used before the bulk build up. Liners are a very important step in obtaining a strong, sound bond between zirconia and ceramic overlay. The pictures also "scream out" a under-supported zirconia coping. Labs have spent millions on zirconia milling systems. We are all still learning and fine-tuning better processing techniques for zirconia. I suppose time will tell with the impact.

DMC · 01-05-2009, 06:16 AM

That data is more than one year old. The porcelain was underfired on the LavaCeram unit. I have heard stories round and round about this test. Dr Christiansen's wife is a poor scientist and tester IMO.

I've used LavaCeram for years. ???

(Made in same place as GC)

Al. · 01-05-2009, 07:51 AM

Quote:

Originally Posted by DMC

That data is more than one year old. The porcelain was underfired on the LavaCeram unit. I have heard stories round and round about this test. Dr Christiansen's wife is a poor scientist and tester IMO.

I've used LavaCeram for years. ???

(Made in same place as GC)

Well mabey the makers of LavaCeram didnt donate as many $'s as the makers of GC towards Christiansen's scientific studies.

TheLabGuy · 01-06-2009, 07:48 AM

Quote:

Originally Posted by Al.

Well mabey the makers of LavaCeram didnt donate as many $'s as the makers of GC towards Christiansen's scientific studies.

sad but true.......

01-05-2009, 06:16 AM	#3 (permalink)
DMC Extended Member Join Date: Sep 2008 Location: Richmond VA Age: 36 Posts: 24 Gallery: 0 Rating: 0% (0) Rep Power: 0	That data is more than one year old. The porcelain was underfired on the LavaCeram unit. I have heard stories round and round about this test. Dr Christiansen's wife is a poor scientist and tester IMO. I've used LavaCeram for years. ??? (Made in same place as GC) __________________ www.dominionmillingcenter.com

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11-25-2008, 12:41 AM	#2 (permalink)
sixonice Member Ms.pacman New Champion! Homeland Defense Champion! Grand Prix Challenge 2 Champion! Join Date: Sep 2007 Posts: 47 Gallery: 0 Rating: 0% (0) Rep Power: 0	Thanks for posting this report Travis. This is not the best news for zirconia folks. Dr. Gordon Christiansen (founder & CEO of CRA-Clinical Research Associates) has many dentist "followers". It is amazing that when he gives the "thumbs-up"... how a product or material can prosper & when he gives a less than ideal evaluation....that it can cause a big ripple. I personally do not think this is to much to worry about, although I have talked to some friends about this report already. We all will probably receive a few calls from dentists. We just have to be prepared to help the dentist understand it is a very good material WHEN PROCESSED CORRECTLY. Looking at the pictures of the failures, it is very clear that these units were overlayered, underfired or ground on. The delaminations I believe were caused in part to perhaps no liner being used before the bulk build up. Liners are a very important step in obtaining a strong, sound bond between zirconia and ceramic overlay. The pictures also "scream out" a under-supported zirconia coping. Labs have spent millions on zirconia milling systems. We are all still learning and fine-tuning better processing techniques for zirconia. I suppose time will tell with the impact.