Post-processing selective laser melted coping/bridges for dental ceramic veneering
The build supports that we are using during manufacturing, the post-processing is easy and less time consuming. The supports can be removed using a pliers and on the surface where supports were present, a light finishing with a burr for metal is required. Because the coping's and bridges are build in accordance with the 3D design, there is no need for intensive finishing (as is in the case of parts made using LWC method).
Finishing and cleaning
A thorough sand blasting of the surface is required, with aluminium oxide (grit 110-150 μm) at 2-3 bar. If the surface will be finished with metal burrs, this burrs must be for Co-Cr alloy (carbide burr or diamond burr). The milling/finishing with burrs must be made in such way to avoid overlapping on the alloy surface (this could cause later the bubbling of ceramic)
Before ceramic veneering, the surface must be sand blasted with new/clean aluminium oxide media (grit 110-150 μm, at 2-3 bar), cleaned with steam or water and degreased with ethyl alcohol.
The oxide firing is not required. If it is done for visual metal inspection (at 950-980°C), before ceramic veneering, the surface must be sand blasted with new/clean aluminium oxide media (grit 110-150 μm, at 2-3 bar) and cleaned.
If low temperature firing ceramic is used, the Co-Cr alloy that we use do not require slow cooling. Is important to follow the specifications of the ceramic masses manufacturer that is used for veneering.
Coefficient of thermal expansion is 14.0 μm/m°C.
Slow cooling is recommended in case of high temperature firing ceramic masses, also in case of large bridges.
Does not require extra conditions for polishing.