The Pure-Press Restoration: Step By Step
Posted Apr 28, 2011 in Technical
Using the Pure Press technique I developed, I'm able to create crowns with the strength of a PFM and the esthetics of an all-porcelain restoration. By pressing porcelain to electroformed copings, the ceramic has a bright yellow core instead of a dark oxidized conventional cast metal core.
These restorations are also biocompatible, reduce the cost of materials by plating only to the shoulder of the preparation, reduce labor time and simplify cementation since the dentist can use traditional zinc phosphate cement. Pure Press restorations can also be used on implant components or custom made-abutments.
In all cases, the proper relationship between the unsupported mass of porcelain and the framework should be critically observed. Furthermore, the thermal expansion of your press porcelain must match the thermal coefficiency of gold.
Following is a step-by-step look at how I used the Pure Press technique for a female patient who needed to have teeth #7 and #9 replaced (see top photo at right). In order to create an overall pleasing appearance, she opted for restoring all four anterior teeth. The color matched her existing teeth and she is very pleased with the improvement and her beautiful smile.
The margins were perfect and the incisal translucent effect was acceptable even without a cutback. For optimal cement bonding, I sandblasted the inside of the crowns before insertion.
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