Frequently Asked Questions
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How comprehensive is the clinical experience with the CeraSys™ Crowns and Bridges?
Beginning with its introduction the CeraSys™ System has established as one of the leading All-Ceramic
Systems and looks back to a successful 5-year clinical experience. Clinical studies show very good long term
stability, no fractures of the framework, no allergic reactions as well as no negative influence on the neighboring
gingiva.
What distinguishes CeraSys™ from the other all ceramic systems and what is its composition?
CeraSys™ is based on a framework made from Zirconia (CeraBlock™) and feldspathic overlay porcelain, which
has been specially designed to meet the requirements of the framework. The Zirconia ceramic is a tetragonal
polycrystalline Zirconia partially stabilized with Yttria (admixture of approx. 3mol- %) (Y-TZP = Yttria Tetragonal
Zirconia Polycristals), which extremely qualifies them for restorations in the anterior and posterior region.
Compared to other Zirconia ceramics the CeraSys™ Zirconia frameworks can be dyed before sintering.
How does the accuracy of fit compare with typical porcelain fused to metal?
Literature indicates a theoretically required accuracy of fit of 50 - 100 µm for crowns & bridges. Investigations
show an excellent accuracy of fit below the required standard values for 4-unit CeraSys™ bridges and 4 splinted
CeraSys™ crowns (see chapter 5.7). Furthermore, Dr. S. Reich of the University of Erlangen was able to show,
that there is no significant difference of the AMO-values for 3-unit CeraSys ™ bridges and porcelain fused to
metal restorations
Is CeraSys™ sufficiently strong for posterior bridges?
Posterior applications are possible for the first time with Zirconia frameworks because their strengths exceed
the maximum load (600 N) several times. Internal and external investigations confirm that 3-unit bridges after
artificial ageing (simulation of 5 years carrying time) in the mastication simulator (1.2 million cycles) with
simultaneous thermal cycling (10.000 x 5°-55°C) have a strength of 1.450 N to 1.200 N for 3- or 4-unit bridges,
respectively.
How aesthetic are the results with CeraBlock™? Is Zirconia white/opaque?
The CeraBlock™ Zirconia framework is ideally translucent due to its high density (no residual porosity) and
homogeneity - and due to the dyeability of the CeraSys™ restorations no longer white-(opaque), as we know it
from the past or other technical/medical applications. There is the option of coloring the Zirconia framework in 7
VITA Classic shades. Highly aesthetic restorations are possible in combination with the veneering System
which matches with this basic coloring. The framework wall thickness of 0.5 or 0.3 mm, which is possible due to
the high strength of Zirconia, supports the excellent translucency and provides ample opportunity for aesthetic
layering with the overlay porcelain.
What are the preparation requirements for a successful long-term restoration?
In principle, many of the requirements for porcelain fused to metal restoration can be applied to the CeraSys™
All-Ceramic System. Fabrication of a CeraSys™ restoration requires a preparation having a circumferential
chamfer or shoulder. The preparation angle should be 4° or greater. The inside angle of the shoulder
preparation must have a rounded contour. The preparation for the CeraSys™ all ceramic restoration can be
done with removal of less tooth structure thanks to the framework’s thin wall thickness of only 0.5/0.3 mm.
Supragingival preparations are possible due to CeraSys™’s excellent fit characteristics and optical properties.
What are the recommended porcelain veneering materials used for all ceramic restorations?
The following veneers have been tested thoroughly for best quality, strength and aesthetics:
Beginning with its introduction the CeraSys™ System has established as one of the leading All-Ceramic
Systems and looks back to a successful 5-year clinical experience. Clinical studies show very good long term
stability, no fractures of the framework, no allergic reactions as well as no negative influence on the neighboring
gingiva.
What distinguishes CeraSys™ from the other all ceramic systems and what is its composition?
CeraSys™ is based on a framework made from Zirconia (CeraBlock™) and feldspathic overlay porcelain, which
has been specially designed to meet the requirements of the framework. The Zirconia ceramic is a tetragonal
polycrystalline Zirconia partially stabilized with Yttria (admixture of approx. 3mol- %) (Y-TZP = Yttria Tetragonal
Zirconia Polycristals), which extremely qualifies them for restorations in the anterior and posterior region.
Compared to other Zirconia ceramics the CeraSys™ Zirconia frameworks can be dyed before sintering.
How does the accuracy of fit compare with typical porcelain fused to metal?
Literature indicates a theoretically required accuracy of fit of 50 - 100 µm for crowns & bridges. Investigations
show an excellent accuracy of fit below the required standard values for 4-unit CeraSys™ bridges and 4 splinted
CeraSys™ crowns (see chapter 5.7). Furthermore, Dr. S. Reich of the University of Erlangen was able to show,
that there is no significant difference of the AMO-values for 3-unit CeraSys ™ bridges and porcelain fused to
metal restorations
Is CeraSys™ sufficiently strong for posterior bridges?
Posterior applications are possible for the first time with Zirconia frameworks because their strengths exceed
the maximum load (600 N) several times. Internal and external investigations confirm that 3-unit bridges after
artificial ageing (simulation of 5 years carrying time) in the mastication simulator (1.2 million cycles) with
simultaneous thermal cycling (10.000 x 5°-55°C) have a strength of 1.450 N to 1.200 N for 3- or 4-unit bridges,
respectively.
How aesthetic are the results with CeraBlock™? Is Zirconia white/opaque?
The CeraBlock™ Zirconia framework is ideally translucent due to its high density (no residual porosity) and
homogeneity - and due to the dyeability of the CeraSys™ restorations no longer white-(opaque), as we know it
from the past or other technical/medical applications. There is the option of coloring the Zirconia framework in 7
VITA Classic shades. Highly aesthetic restorations are possible in combination with the veneering System
which matches with this basic coloring. The framework wall thickness of 0.5 or 0.3 mm, which is possible due to
the high strength of Zirconia, supports the excellent translucency and provides ample opportunity for aesthetic
layering with the overlay porcelain.
What are the preparation requirements for a successful long-term restoration?
In principle, many of the requirements for porcelain fused to metal restoration can be applied to the CeraSys™
All-Ceramic System. Fabrication of a CeraSys™ restoration requires a preparation having a circumferential
chamfer or shoulder. The preparation angle should be 4° or greater. The inside angle of the shoulder
preparation must have a rounded contour. The preparation for the CeraSys™ all ceramic restoration can be
done with removal of less tooth structure thanks to the framework’s thin wall thickness of only 0.5/0.3 mm.
Supragingival preparations are possible due to CeraSys™’s excellent fit characteristics and optical properties.
What are the recommended porcelain veneering materials used for all ceramic restorations?
The following veneers have been tested thoroughly for best quality, strength and aesthetics:
APD Zirconia Dental Prosthetics Group - Accelerated Product Development
Naperville, Illinois
630-702-9100
Naperville, Illinois
630-702-9100
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