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General preparation information

  • * The preparation can be carried out either using a chamfer or a shoulder preparation with rounded interior angle.
  • * A circular cutting depth of one millimeter is required.
  • * The vertical preparation angle should be 3°, however, parallel preparation is also possible if clinically required.
  • * All transitions from the axial towards the occlusal surfaces must be rounded.

 

CAST PARTIAL DENTURES

Removable Partial Dentures with cast metal frameworks offer numerous advantages over the conventional partial dentures commonly used. The frameworks of these dentures are cast to fit the teeth. Since they sit on the teeth, as well as being attached to them, they are extremely stable and retentive. The teeth have to be altered slightly beforehand in order that the partial denture can rest upon them without interfering with the way the patient bites the teeth together.
The metal framework does not contact the gums. Thus, as the gums resorb, this type of partial denture does not sink with them and rarely requires relining. Because the teeth are altered beforehand, there are fewer limitations in the placement of clasps, and they are less likely to be seen than the wrought wire clasps of the conventional treatment partial denture. Modern frameworks are cast from an extremely strong alloy called chrome cobalt which can be cast very thin and are much less likely to break than the all plastic variety. They are also much less noticeable to the tongue.

The largest single advantage that cast metal framework partial dentures have over the other types of partials is that sore spots are almost never an issue since neither the framework, nor the plastic extensions contact the soft oral tissues with any force! Patients who exhibit the symptoms of TMJ, or who are known bruxers are much better off with cast metal partials than with flexible framework