Prismatik UniPack Technique Manual - Glidewell Dental Labs

We may conclude from these tests that Prismatik Ceramic powders are compatible
with a wide variety of frequently used alloys with the thermal expansion ratios
covering a broad range from 13.6 ppm to 14.8 ppm (25-500ºC). Due to the vast
number of ceramic alloys on the market today it is impossible to recommend compatible
alloys that can be successfully employed in partnership with the Prismatik
Ceramic System. Please contact your alloy manufacturer’s technical department for
a list of CTE compatible alloys in accordance with the CTE data chart.
Wear and Opposing Compatibility Factors
One of the prime considerations when selecting a ceramic material has to be the
wear factor of the material and how it affects the opposing dentition. Prismatik
Ceramic exhibits much less wear loss compared to conventional porcelain-fusedto-metal
restorations because of the small leucite crystals. Many dental patients
with Prismatik restorations in place are already benefiting from its superior kindness
to opposing dentition and low ceramic wear.
Time and Temperature/Optical and Physical Characteristics
Most of the desired esthetics in ceramic materials is established during the first
body bake. (See Figure 2 - Prismatik UniPack Firing Parameters.) The firing chart
is provided to give you a recommended starting point in order to achieve the
proper high sintering temperature in your furnace. To achieve a natural glaze on
the restoration if desired and to ensure proper sintering of the porcelain mass it is
always better to err on the higher end of the ideal sintering temperature rather
than the lower end. Overfusion reduces porosity but it also lowers value. Repeated
firings at the high end of the proper sintering phase will also lower the coefficient
of thermal expansion of the porcelain.
Under-fusion results in more opacity of the material and it lowers chroma. It also
produces higher value restorations. Underfiring produces a weak restoration
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