RPD Manual 11 - Removable Prosthodontics - Dalhousie University

Interim Removable Partial Dentures - 94
Fabrication:
1. Make preliminary impressions
2. Pour diagnostic casts, survey, design a definitive partial denture
3. Optional Step (preferred)
- Prepare guide planes, rest seats that will be used in the definitive RPD
- Make new alginate impression, pour, survey, select path of insertion, tripodize
4. Maxillo-mandibular relations (facebow, occlusal vertical dimension, centric record if
there are unstable contacts, protrusive record)
5. Articulate the casts
6. Draw design for interim partial denture
Interim Partial Denture Design:
Clasps (Wrought wire 0.02”)
- Circumferential
- Adams clasps
- Ball clasps
Bracing
- the lingual/palatal acrylic of the RPD provides bracing through contact with the teeth at
the heights of contour of the teeth
Rests
- wrought wire can be bent on itself and/or flattened and placed into the rest seats
- acrylic may be used over cingulum rest seats
- if longer term use is expected, cast rests and bracing arms can be embedded in the acrylic
Major Connectors
- Full palatal coverage increases strength and stability
- Generally extend the denture to at least the first molar for stability
- Retentive clasps are embedded into the acrylic major connector
Prescription writing:
1. Mark any teeth to be extracted on the cast and write the teeth number on the
prescription, draw a line where the cast to where the cast should be surgerized
2. Survey the cast and mark height of contour and retention areas (0.02”)
3. Indicate type of retentive clasp, rest and bracing.
4. Indicate where rests, retention arms and bracing are to be placed, state tooth # and
surface
5. Draw the outline of the denture on the cast
6. Identify the shade and mould of teeth selected
7. State the type of occlusion required
Laboratory Steps: To improve results, interim partial dentures should be sent to the lab for
three distinct procedures:
1. Blockout & duplication of casts, fabrication of record bases & occlusion rims. The lab
will return these for you to make jaw relations records and mount casts
2. Setting of teeth. The lab will return the partial dentures for a full wax try-in
3. At the final lab phase, the technicians will place retainers, scribe post dam, process