Site Map ADD TO FAVORITE
knowlegde Applications of White Fused

What type of porcelain is used for the overlay materials for zirconia c…

  • There are a number of zirconia-optimized porcelain systems available. Most zirconia ceramics have a coefficient of thermal expansion (CTE) of about 10. Make sure the overlay porcelain has a CTE close to 10. Do not use porcelain intended for PFM.

What is the best substructure design to provide sufficient support?

  • The overlay porcelain should not be thicker than 1.5 to 2 mm depending on the location and should be adequately supported by the zirconia coping.

How much strength do you really need with zirconia at the marginal ridg…

  • How much strength do you really need with zirconia at the marginal ridge areas if the overlay materials have less strength that can result in fractures?The fractures are most likely caused by insufficient support of the overlay porcelain in the marginal r

Is preparation design of a zirconia coping important since the zirconia…

  • Preparation design of the zirconia coping is very important. The thickness of unsupported porcelain should not exceed 2 mm. The zirconia coping should be as thick as needed to avoid unsupported porcelain.

Is it ok to grind on a zirconia coping without water spray?

  • Water spray is necessary when grinding on a zirconia ceramic coping. The white light or hot spot you see between a diamond and a zirconia ceramic has been measured at 1500 C. If the temperature of zirconia ceramic rises above 1000 C, a phase change can oc

Does silane treatment improve the bond strength of a resin cement to a …

  • No, but the use of Rocatec/Cojet (3M ESPE) does. Silica particles are embedded into the surface of zirconia and then silanated. This treatment can increase the bond strength of a resin cement to a zirconia coping.

Is the fit of a zirconia coping important since the zirconia ceramic is…

  • The thicker the cement the weaker the all-ceramic restoration. Cements are not as rigid as zirconia ceramic, so a thicker cement layer will cause more flexural deformation of a ceramic core, increasing the potential for fracture.

Is the fit of a zirconia coping important since the zirconia ceramic is…

  • The thicker the cement the weaker the all-ceramic restoration. Cements are not as rigid as zirconia ceramic, so a thicker cement layer will cause more flexural deformation of a ceramic core, increasing the potential for fracture.

Does shading or coloring zirconia ceramic reduce the strength as compar…

  • Weakening of colored zirconia ceramic copings has not been observed.

Does it takes longer to remove a zirconia crown with a bur compared to …

  • Fine diamond burs can cut thru a zirconia crown just as fast as a PFM crown.
< < 12 > >
SERVICE
phone

0086-731-8486-2982