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Framework preparation
After finishing with tungsten-carbide cutters, unless otherwise recommended by the alloy manufacturer, sandblast the alloy framework with aluminium oxide (100-150 µm) at a pressure of 2 bars (non-precious alloys: up to 4 bars). When creating a ceramic margin (such as the one shown above), use a carbide bur to reduce the crown margin so it ends 0.5-0.8 mm above the lowest part of the chamfer or shoulder. Also, care must be taken to ensure that the crown margin tapers off softly to avoid tension within the ceramic material. |
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