After hydrofluoric acid etching of the ceramic a layer of salts develops on the surface which acts as a barrier preventing good priming of the surface. Phosphoric acid is thought to remove these salts and dissolve them for a fresh surface. (However this is an arguable matter and some argue against its use)
@@drabyad2498 the phosphate groups in the phosphoric acid fight to bind with the phosphate groups in the cement less adhesion to the crown/tooth interface. Not recommended anymore
Porcelain is brittle like natural tooth but porcelain is so hard to withstand chips and cracking although wrong or heavy frequent compact forces could cause fracture by the way. So it's indicated as veeners or full crowns just for anterior teeth where no heavy forces might be applied on likewise posterior teeth
@@dr.davident actually I need to know if it’s ok or we will face problems later ,there is a theory says do one step curing (bonding ,cement and veneers) so we will not lose the fitting
@@user-hd3hy4co1h You can not ensure that you get a proper hybrid layer if you co-cure. You need to cure the bonding agent on tooth surface separately to make sure you get a good hybrid layer. As for sitting issues, you need to completely air thin the bonding agent.
Quick question Mario, what do you think about curing the bond prior to cement application? Does it make any difference? I see you cure everything all at once, does this give better results? Thanks for sharing!
Louis Barros I cure the adhesive layer prior to bonding the restoration. For me it is critical to have a fully polimerized hybrid layer and curing all at once can create some problems if it does not reach the adhesive layer with the needed energy.
@@puneetsekhon3436 the use on bonding agent in the intaglio surface is only to improve “wetability” of the resin cement to the silanated glass surface.
@@AHMEDSAlAH-qv3ss dry by air only then put your adhesive..with variolink you don t need to put adhesive in the veneer..you put it only in the tooth surface
This video is supposed to show the process of cementation, not color matching. You commented negatively in only way you knew how. It says three things: You don't know much. You're craving negativity. Your comment is irrelevant.
