Overview of Interim Removable Partial Dentures: Purpose, Design, and Fabrication

1. Interim Removable Partial Dentures

2. Interim Removable Partial Dentures • Short period of time • Prior to a definitive denture • Acrylic major connector, wrought wire clasps

3. Indications • Large pulps (can’t fabricate bridge) • Clinical crowns too short • No usable undercuts

4. Indications • Children - permanent prosthesis would be quickly outgrown • Temporary space maintenance (caries, trauma, congenitally missing teeth)

7. Indications • Temporary time or financial constraints • Sudden loss of teeth, before sufficient healing has occurred (accidents, after extractions)

11. Indications • Transitional Denture • Transition to a complete denture • Teeth need to be extracted but not immediately (medically compromised) • Patient is not psychologically prepared

15. Indications • Treatment Denture • Improve a condition before a definitive denture

16. Indications • Treatment Denture • Tissue conditioning

17. Indications • Treatment Denture • Implant healing

18. Indications • Treatment Denture • Alteration of vertical dimension / occlusion • Determine how patient will respond to changes (TMD) • Surgical Splint • Removal of palatal tori

21. Interim Prosthesis Fabrication • Preliminary impressions • Design the definitive partial denture (interim denture will use similar design)

22. Interim Prosthesis Fabrication • Optional Step • Tooth preparations for definitive RPD • New alginate impression

23. Interim Prosthesis Fabrication • Maxillo-mandibular relations • Articulate casts

24. Design • Clasps (Wrought wire 0.02”) • Circumferential

25. Design • Clasps (Wrought wire 0.02”) • Ball clasps • Rest and retentive elements

26. Design • Clasps (Wrought wire 0.02”) • Adams clasps • Rest and retentive elements

27. Design • Bracing • Lingual/palatal major connector provides bracing • Contacts teeth at the heights of contour

28. Design • Rests • Usually wrought wire • Acrylic may be used over cingulum rest seats • Longer term use - cast retainers

29. Design • Major Connector • Full palatal coverage increases strength & stability • Extend denture to first molar • Retentive clasps embedded into major connector

30. Prescription Writing • Mark teeth to be extracted on cast & write teeth #’s on prescription • Draw a line around teeth where cast should be surgerized

31. Prescription Writing • Survey the cast & mark height of contour & retention areas (0.02”) • Indicate type of retentive clasp, rest & bracing

32. Prescription Writing • Indicate location of rests, retentive & bracing arms • Draw outline of denture base on cast • Identify shade & mould of teeth • State type of occlusion required

33. Adjustment Commonly adjust: • interproximal extensions (A) • where clasp exits from resin (B) • tissue undercuts (C) (McCracken's Removable Partial Prosthodontics, 11th Edition. Elsevier, 2005)

34. ‘Flipper’ • Slang - No Clasps