Hi Jason, thank you!!! that's what it would be. Sirona. I'm surprised that this dentist had no idea what i was talking about when I asked what block of cerec it was and instead he gives me the name of the company.

I do not know about bonding agents and what would be best. Often the dentist won't say anything about the bonding agent which is odd because that too is going in the mouth and needs to be tested or proven to be biocompatible.

I'm hoenstly tired of them all. I feel like when I phone up that I have to squeeze out any answers at all from them and often they have no idea what I am talking about. it's quite incredible. Even the ones making great claims, once you really get down to it, they are not quite as knowledgeable as you thought and you wonder who to trust.

Thank you for the link, that's a great help. I'll check it out.

Rebecca.