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Home page  |  Techniques  |  Technical info about dental attachments  |  The casting

The casting


Casting is a technique adopted in dentistry from the 80’s to cast attachments directly positioned in the wax.
Such a technique is applied only with attachments made of a special burnout plastic that is eliminated by calcination and susbstituted by metal.
The calcinable component, patrix or matrix, is generally situated in the primary part, while the other component of the attachment (in plastic or metal) is fitted in the framework.
This method eliminates some drawbacks caused by the traditional systems (soldering and casting-on), but it will never reach the level of precision of a mass produced attachement. That’s why to achieve a good result the following indications must be respected:

  1. Casting alloys must have mechanical strength similar to alloys suitable for milling (type 4);
  2. Use phosphate-bonded investments avoiding quick pre-heating cycles;
  3. Avoid using stress-relieving agents;
  4. Make the surface finishing by blasting with glass beads and then handly polish.

Only some shapes of attachments (such as Swift-Art) allow the attachment surface to be rectified with a milling machine.
  • Cost-effective components
  • Adaptable to the gum contour

  • Matrix and patrix hard coupling
  • Misfit of the connection
  • Lost of retentive life
  • Undefined mechanical strength
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