REMOVABLE PARTIAL DENTURE

800.00

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Minimum number of clasp required to retention of the removable partial den­tures is 2

Undercut for

  • Cast alloys clasp—0.01 inches
  • Wrought alloy—0.02 inch
  • Combination clasp—0.03 inch

Shoulder of the clasp prevents horizontal dislodgement.

Additional function of clasp is for distribution of stresses to the abutment teeth.

Retention provided by direct retainer support provided by occlusal rest.

Distal extension RPD

  • Combination clasp— Wrought + cast—used in lower distal extension RPD.
  • Wrought wire clasps are more ductile and resilient compared to cast gold alloys.

First step in altering abutment contour for clasp retention in RPD is place­ment of guiding planes after disking the proximal surfaces.

Position of the clasp on the abutment depends on:

  • Position of the horizontal undercut
  • Height of contour.

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