Dr. A. asks:
My sales rep told me that I should not use a dual cure resin cement to cement veneers because over time, they will stain. Something in the dual cure cement is supposed to degrade and that is what causes the staining. I have been cementing my veneers with Rely X-Unicem (3M) which is a dual cure resin cement. I know 3M has resin cements specific for veneers but I like the RelyX-Unicem and use it for everything. Is this true about the cement staining over time? Should I use a different cement for the veneers?
Using Dual Cure Resin Cement for Veneers: Stain Over Time?
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Dr A
No you shouldn’t dual cure veneers. I don’t know about staining but they will grey/lower value out over time. Unicem was designed for restorations like crowns, onlays and inlays only. Veneers should only be lightcured which rely X has a system for this.
If you use Unicem for zirconia restorations make sure you use metal primer silane on the internal surface for a better bond.
Rick
I don’t think that dual cure resin cement is appropriate for cementing your veneers. I know such cases that after a very short period veneers were colored because of dual cure resin cement. In any case follow your dentist’s advice.
No you shouldn’t use dual or self cure cements for veneers, they contain tertiary amines which discolour over time. Therefore you should only use a light cured cement for them. Unicem is a self adhesive cement and should only be used for a restoration which has a strength of 360 mpa or above, eg Emax or stronger. I personally don’t use unicem for anything as the strength of self adhesive cementation is very low.