When we cemented the zirconia crowns, first of all, we needed to have a clean dental material

We want to talk about two zirconia crowns that had a de-cementation. They just detached from the sleeves. The cement stayed on the sleeves. You can see that you don’t have any residues of cement. You have the composite material that closes the hole, but the sleeves just detached, the crowns just detached from the sleeves.