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Dentists have a wide variety of treatment options available to improve the patient's oral health and solve any dental issues. In most cases, dental problems can be solved by performing the restoration directly on the tooth. However, there are some cases where the restoration needs to be crafted outside the mouth and later bonded to the tooth.
These restorations are crafted in a dental laboratory by a dental technician. Depending on the type of restoration and the material used, the technician possesses different tools and methods to make it.
However, a centrifugal casting machine is one of the most versatile and traditional crafting methods.
A centrifugal casting machine is a usual dental laboratory machine. As the name suggests, this machine uses centrifugal forces to cast restorations.
Casting is the term given to the process of forming or creating an object inside a mold. In this case, the crafted item is a dental restoration or dental prosthesis.
The centrifugal casting machine can turn multiple materials into restorations, such as ceramic and precious metals. However, titanium can't be used to cast a dental restoration.
These machines can be spring-driven or function by a motor. Nonetheless, both versions are highly effective and capable of creating accurate and precise restorations.
The centrifugal casting machine possesses different elements. It has a large round base that is safely fixed to the workbench. On top of the base, there is a spinning mechanism that is responsible for casting the restorations.
The machine possesses a spinning arm where the material is placed. On one end, this arm has a ring where the casting is done and a crucible to load the metal. Finally, the spinning arm has a counterweight on the opposite end to balance the machine while it spins.
To perform a casting, the laboratory technician needs to load the metal or any other material inside the crucible. Once loaded, the technician heats the material until it turns liquid. This is usually done through a special blowtorch and can take a few seconds or minutes.
Afterward, the centrifugal casting machine is activated, causing the arm to spin at high speed. The centrifugal forces create enough pressure to make the liquid material move from the crucible into the mold inside the casting ring.
To ensure the procedure's success, the tension produced by the centrifugal forces must be maintained for at least 4 seconds after the casting is done.
Once finished, the laboratory technician just needs to remove the casting from the mold inside the ring and adjust any details on the restoration.