CE0197

Waxing-up

Wall thickness (in wax) should not be less than 0.35 mm diameter.
Apply indirect spruing. For the casting sprues use round wax wires with a diameter of 3.5 mm for single-unit crowns and of 3.5 to 4 mm for bridges. For large structures with 4 pontics and more use a feed channel of 0.4 mm.

Investing and Casting

Phosphate-bonded crown and bridge investment materials can be used. The preheating temperatures range between 850 and 900 °C. The holding time after the final temperature has reached is at least 30 minutes. It is imperative to follow the relevant casting machine manufacturer's instructions for use. Use always a new ceramic crucible for ADORBOND CN to avoid contaminations which may occur by residuals from previously used alloys. Clean crucible after each casting process. Casting should be started after all the cylindrical ingots are melted together and the melt shows a uniformly light appearance. When melting with the torch, take care that the correct flame is adjusted according to the manufacturer's instructions. With a loose circular motion of the flame in the reducing zone, continue the melting process until the metal is seen to move under the pressure of the flame. Allow casting ring (muffle) to cool down to hand temperature and divest.

Ceramic build-up

Ducera, Ivoclar or De Trey, for non-precious dental ceramic bonding alloys can be used. Observe the respective manufacturer's instructions for use. After separation of the sprues and finishing:

1.    Sandblast the framework surface in a pencil blaster using aluminium oxide    100 or 250 μm.

2.    Clean the framework with distilled water in an ultrasonic bath, or degrease   in ethyl acetate.

3.    Carry out oxide firing under vacuum for 5 to 10 minutes at approx. 960 °C.

4.    Always sandblast the oxide layer again after the oxide firing!

5.    Apply a thin layer of opaque. Apply uniform cover only at the second            opaque firing. Always allow paste opaque to cure at room temperature        before heating.

6.    Ceramic build-up according to the porcelain manufacturer's instructions.

7.    Cool down after firing in a normal manner.

Final works

After completion smoothen unveneered sections of the framework with rubber polishers and polish to high lustre using a polishing paste for cobalt-based alloys or rotating polishing tools.

Soldering and Welding

Use a cobalt-based solder and high-temperature flux for soldering.
For laser welding use a standard Co-Cr laser wire as filling material.

Safety Hints

Metal dust is harmful to your health. When finishing and blasting us a suction/extraction system

Warranty

Our recommendations of use are based upon our own experience and trials and can only be considered as approximate values and guidelines. Solely the user is responsible for the correct processing of products.

Rev. B/17.08.11