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#1 (permalink) |
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Buell
Join Date: Aug 2007
Location: PA
Age: 33
Posts: 1101
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The lastest CRA (Clinical Research Associates) report on zirconia restorations.
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#2 (permalink) |
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Member
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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.
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#3 (permalink) |
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Extended Member
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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) |
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