Dentsply Sirona Cercon ht Instrucciones De Uso página 73

Separating the sintering reinforcement in the case of large-span bridges:
Objects are separated from the "tongue" after sintering using irrigated rotary diamond cutters.
Manual finishing after sintering:
• Sandblast the inside and outside of the framework with aluminium oxide (110–125 μm, max. 2–3 bar,
45 ° angle).
• Eliminate premature contacts one by one until the framework has reached its final position on the die(s).
• During the try-on and fitting of the framework, keep the dies on the cast and try on the framework as a whole.
• Once the try-on and fitting has been completed, do not perform any additional adjustments such as
finishing the entire framework.
Note: Zirconia crown or bridge abutments should fit passively, without friction. The rationale for requiring a
passive fit if zirconia frameworks lies in the physical properties of the material itself: Ceramics will tolerate
compressive stress but not tensile stress. In crowns that exhibit a friction fit, this friction is generated by certain
"bearing" parts of the framework, as the crown itself never rests completely on the die due to processing-
related surface roughness (the same actually holds for cast-metal frameworks). So it is only the peaks of the
surface roughness (the named "bearing" parts) that are in contact with the die surface. This converts the
compressive forces generated by masticatory pressure into tensile forces, which may damage the crown.
Adapt the framework margins exactly to the preparation margins.
Note: Sintered zirconia should be finished using diamond instruments under proper irrigation only. Keep the
pressure on the framework material to a minimum and work only in one direction.
• Sandblast the finished areas once again with aluminium oxide (110–125 µm, max. 2-3 bar, 45 ° angle).
• Finally, clean the framework using a steam cleaner.
Veneering/staining:
Adjust your build-up technique to the respective Cercon ht shade.
Note that the light transmission of Cercon ht is very high due to its translucency.
General
The reproduction of the individual patient's tooth colour can be significantly influenced by:
• Shade of the die
• Shade of the material used for temporary or definitive cementing
• Framework wall thickness
• Liner, if applied
Cercon® ht Instructions for Use 69