At two years, zirconi and metal frameworks performed equally well with no breaks. Alumina had a 26% breakage, which indicates a high risk in posterior multi-unit restorations. Veneer ceramics pressed to zirconia and metal had significantly fewer defects than layered ceramics. At this point, veneer ceramics designed for zirconia need close clinical observation with an eye to improvement in formulation and handling.
You can read the full results of the study HERE.
-Eric P.
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