76 - 77
The porcelain restorations were tried in and evaluated and modifications were completed prior to beginning the adhesive process. To prevent contamination during the adhesive procedure, a 3-0 silk cord (3-0 Silk Suture, Ethicon) is gently placed in the sulcus using a bimanual technique. This silk cord seals the sulcus and prevents contamination of the preparation from blood or crevicular fluid during the adhesive protocol. (76 - 77) The internal surface of the zirconium crowns are microetched with a tribochemical silica coating (Rocatec/CoJet System, 3M™ ESPE™) followed by an application of an MDP-containing bonding/silane coupling agent mixture (Porcelain Bond Activator mixed with Clearfil SE™ Bond Primer, Kuraray). The microetching of highly crystalline ceramics such as zirconium with a tribochemical silica coating creates binding sites for the silane molecules while the silane provides wettability and a chemical coupling with the methacrylate based cements. (78 - 79)
78 - 79
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