When making a titanium framework, the Bridge Support – Titanium should be used. The prefabricated Bridge Supports are sent to the precision laboratory together with the framework.

When working with the Bridge Support - Burnout the Bridge Supports have to be casted separately in the same alloy as the framework. This is done by the Method Laboratory and the casted Bridge Supports are sent to the Precision Laboratory together with the framework.

To get the best possible final result from the casted Bridge Support, it is important to carry out the investing and casting procedure with care and follow the instructions.

1. Place the wax sprue in the occlusal end of the Bridge Support. The wax sprue should not interfere with the thin groove on the Bridge Support. After the casting procedures, the Bridge Support will be cut at the thin groove, and it is important that there should be no residual material on the final Bridge Support.

2. Mount the wax sprue, together with the Bridge Support, onto the investment cone so as to facilitate investing. Usually this means placing the Bridge Supports as vertically as possible, with the apical end facing upwards.

Note: Preparations for investing may vary with different investment techniques and casting processes. Follow the investment material manufacturer’s instructions.

The Bridge Support can usually be invested and cast in the same investment as the framework, but sometimes the expansion properties call for separate investment material.

Note: Follow the instructions given by the investment
material and equipment supplier. Do not use a wetting agent during the investing procedures. This may affect the casting of the Bridge Support.

3. Pour the investment material and allow the investment to fill the screw access hole from below upwards. This to ensure that the holes are filled properly. Note: Avoid using speed investment techniques and speed burnout processes. This may cause the investment material to crack as a result of the pressure of the expanding acrylic.

4. Devest after casting and clean the supports using aluminum oxide and low pressure.

5. Cut the Bridge Support at the thin groove. This will give the cast Bridge Support the correct length. It is important that there should be no residual material on the final Bridge Support.Check that all the investment material has been removed and that no casting flaws, such as porosities or external bubbles are present. The Bridge Supports will undergo a reaming process, using a Reamer and a Reamer Jig, at the Precision Laboratory to optimise the design of the cast Bridge Support and the fit to the restoring platform.

Note: The reaming process can only correct minor flaws. It is important to deliver the cast Bridge Support to the Precision Laboratory, as close to final design as possible.

6. Finalize the cast framework. Grind the framework until the final design is reached. This facilitates the handling procedures after the precisioning process.

7. Distortion of the cast framework is usually inherent to the casting of a one-piece frameworks and is a consequence of the cooling phase of the casting procedure.

The distortion does not need to be taken into consideration at this point. After the precision process, the framework will have a perfect passive fit.