Resin retained FPDs (RRFPDs):

By Dr.Swathi Pai on Tuesday, January 13, 2009 with 0 comments

The bond strength of resin to metal is 2-3x greater than the bond strength of resin

to etched enamel.

6 advantages to RRFPDs:

  1. conservative (all margins are in enamel)

  2. all margins are supragingival

  3. no pulpal involvement

  4. their hygienic

  5. good esthetics

  6. no anesthesia is required

  7. less cost

3 disadvantages to RRFPDs:

  1. applications are restricted

  2. there’s no trial period

  3. it may appear easy to do

There should be only one path of insertion!!

The prep should extend past the proximal line angles to resist displacement in a lingual direction. If this cannot be achieved, then small grooves are indicated.

A vertical stop in the form of a rest-seat should be established.

Margins should be 1mm supragingival

Metal commonly used for RRFPDs:

rexillium-Ticonium (Ni-Cr-Be)

biobond- (Ni-Cr-Vanadium)

vitallium- (Cr-Co)

Use these because base metals give maximum strength.

4 reasons for RRFPD failures:

  1. inadequate preparation (no resistance/retention form)

  2. contamination of etched enamel

  3. unfavorable occlusion

  4. faulty etching of the metal surface

Category: Prosthodontics Notes



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