CAD CAM Laboratory - Zirconia

• I would like to start offering all-ceramic bridges to my patients, but am not sure of the long-term durability?
• What kind of adhesive is used to bond a milled zirconia framework to the layered porcelain in an all-ceramic restoration?
• Are there any testing protocols that a dental laboratory can use to determine that his substructure has been processed to provide maximum strength and durability? If so, what are those protocols?
• What are the long-term clinical results of using zirconia in the anterior or posterior?
• Do different zirconia products have different CTEs?
• Do the new feldspathic veneering porcelains for zirconia offer a different (better/worse) bond strength to zirconia substructures?
• What blasting or grinding procedures are recommended for zirconia?
• What is a typical fracture rate in zirconia restorations?
• Does the wiggle room of a milled restoration compromise the retention of a crown?
• What is the connector size for multiple-unit zirconia fixed restorations?
• What is the difference in strength between pressed-porcelain-to-zirconia versus traditional stacked or layered porcelain-to-zirconia?
• How does blasting or grinding affect the zirconia?
• How does bonding affect a zirconia restoration?
• How many unsupported elements (pontics) can you put side by side in a bridge using zirconia?
• How strong is a zirconia-based restoration when the substructure has a flexural strength of 1,200 MPa and the surface ceramic has a flexural strength of 110 MPa?
• How strong is strong enough when it comes to zirconia?
• What type of bonding material should be used with zirconia-based restorations?
• What type of porcelain is used for the overlay materials for zirconia copings?
• What's a closed zirconia milling system and what is the benefit of an open system?
• Where do the fractures of the bonded zirconia restorations compared to the PFM restoration occur?
• Why use zirconia – is this clinician driven or manufacturer driven?
• With porcelain-fused-to-metal systems, ceramic bonds to the oxide layer on the metal. What does the zirconia veneering ceramic bond to?
• Some clinical studies have shown that there is a weakness in the overlay materials that causes fractures at the marginal ridge areas. How much strength do you really need with zirconia if the overlay materials have less strength that can result in fractures?
• Are there differences among zirconia ceramics?
• What is the best substructure design to provide sufficient support for the proximal overlay ceramics?
• What is zirconia?
• Zirconia substructures have high flexural strength, 900-1200 MPa, but what is the flexural strength of the zirconia/porcelain system?
• Does it takes longer to remove a zirconia crown with a bur compared to a PFM crown?
• Does shading or coloring zirconia ceramic reduce the strength as compared to the uncolored zircona?
• Does silane treatment improve the bond strength of a resin cement to a zirconia coping?
• Does zirconia ceramic degrade in strength intraorally in 5-10 years?
• Is it ok to grind on a zirconia coping without water spray?
• Is preparation design of a zirconia coping important since the zirconia ceramic is so strong?
• Is the fit of a zirconia coping important since the zirconia ceramic is so strong?
• Is the fit of crowns and bridges based on zirconia copings as good as that of PFM crowns and bridges?
• What are Lava crowns?