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I send all of my zirconia work out to be scanned and milled. A full zirconia crown was made, finished and sent to the dentist. During the appointment to insert the crown, the dentist was making some adjustments and he said that a translucent 'coping' detached from the inside of the crown. It was as if a coping was made first and then a full zirconia crown was placed on top of that coping. The dentist ended up cementing everything into the patient's mouth. He's asking me why that happened to a full zirconia crown and I don't know what to tell him. I've asked the same question to the milling centre and they don't have an answer for me. The milling centre has offered a free remake, but I'm really curious why that happened. Any ideas?