Frequently asked question.

Q: Do the new feldspathic veneering porcelains for zirconia o…

  • A: New veneering porcelains for zirconia are formulated to match the coefficient of thermal expansion of the zirconia and to bond to the zirconia coping. Some systems require an initial application of a wash layer.

Q: Are there any testing protocols that a dental laboratory c…

  • A: Flexural properties of sintered zirconia specimens can be measured but this test is destructive in nature. It is crucial that the dental laboratory work with a reputable milling center.

Q: What is the difference in strength between pressed-porcela…

  • A: Both techniques should produce adequate strength if the heating and cooling temperatures encountered during processing do not create adverse thermal gradients that cause residual stresses.

Q: Does the wiggle room of a milled restoration compromise th…

  • A: The better the fit, the better the retention. Highly retentive zirconia-based crowns can be cemented, whereas poorly fitting crowns should be bonded to tooth structure. Use a self-adhesive resin cement or bonded resin cement for cases with poor retenti

Q: How strong is strong enough when it comes to zirconia?

  • A: It is important that zirconia-based restorations be stronger initially than PFM due to a small amount of potential deterioration of properties intraorally over time. A zirconia with a flexural strength of 800 MPa should be adequate.

Q: What are the long-term clinical results of using zirconia …

  • A: THE THE DENTAL ADVISOR has been monitoring approximately 500 clinical case restorations over a five-year period with no failures of the zirconia in copings or three- or four-unit bridges.

Q: Where do the fractures of the bonded zirconia restorations…

  • A: Failures of zirconia-based restorations typically involve chipping or delaminating of the overlaid porcelain. These failures can be minimized by proper design of the zirconia coping to properly support the overlaid ceramic.

Q: What is the connector size for multiple-unit zirconia fixe…

  • A: A cross section of 9 mm2 is recommended.

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