Guidelines for cement
All our materials are processed using a unique grinding technology after sintering and thus have good mechanical retention. Therefore, handling of our material differ from any other zirconia. The materials may be cemented with both conventional techniques and adhesive. There are currently many different makes and manufacturers of cement, while it constantly brings new. We always refer to the manufacturer’s recommendations, and handling instructions.
Zn phosphate cement
Zn phosphate cement is due to long clinical experience and ease of handling a very good option in most cases. Zn phosphate cement has been shown to work well for most patients with allergy problems. The aesthetics may be affected due to Zn-phosphate is somewhat opaque. For exclusively aesthetic reasons, we do not recommend Zn-phosphate cement for thin incisors.
Glass ionomers cements
Featured Glass ionomers cements is largely known as resin reinforced (composite), which makes them much stronger and better than previous generations. All Glass ionomers cements works for use with our materials.
Composite cements generally have a great aesthetic advantage thanks to the translucency and color choice. In addition, composite cement have a nonexistent solubility and very good resistance to micro-leakage. The purely chemically curing composite cement works great if all manufacturers recommendations for bonding are followed. Dual -curing composite cement has a chemically curing component and a light-curing . These works today very well. 3M ESPE RelyX Unicem and Ivoclar Vivadent Multilink are good examples that show excellent clinical results. Unicem is recommended as first choice for cementing Denzir Maryland bridges .
All of our materials, unlike many other ceramics can be advantageously used with temporary cementation without demonstrated risk. Traditional temporary cement can of course be used. However, one should be careful with the amount of modifier because you can not turn loose structure, but must be able to pull it off with a floss or probe. Coltène Whaledent TempoSIL is a great option for temporary cementation of restorations for up to one week.
Management of the core
Clinical cleaning of the surface prior to cementation should be done with alcohol. When using composite cement the inside of the crown must be etched with phosphoric acid to remove any protein layer and thus provide greater bonding ability to wet the surface.
The etching of the surface does not provide increased retention because phosphoric acid does not affect the surface. Silansiering not give enhanced binding effect.
Blasting is recommended only for cleaning the surface when necessary. We recommend lightly blasting from the lab with 50 my aluminum oxide and 2 bar.
Abrasive blasting of the surface gives no increased retention. Grinding grooves with its “peaks” from the machine-processing is rounded by too much blasting and you have in effect a smoother surface. However, the “polished” grinding grooves is removed and the surface looks dull.
Thanks to our unique manufacturing process that comprises the surface of small abrasive tracks. A good micro-mechanical retention is provided.