CLASP RETAINED REMOVABLE PARTIAL DENTURES

1. CLASP RETAINED REMOVABLE PARTIAL DENTURES

2. Retentive Arm Bracing or Reciprocal Arm or Plate Rest Minor Connector Major Connector Grid Retention Areas Tissue Stop Indirect Retainer Denture Base Denture Teeth COMPONENT PARTS OF AREMOVABLE PARTIAL DENTURE

3. Cast RPD FrameworkComponents • Major Connector • Minor Connectors • Clasp Assembly • Retention for Replacement Teeth

4. Cast RPD FrameworkComponents • MAJOR CONNECTOR

5. A major connector is the part of a RPD that connects the components on one side of the arch to the components on the opposite of the arch.

8. Major Connector Requirements • Rigidity • Should be contoured • Should avoid circumjacent structures • Minimum bulk

9. Maxillary Major Connectors • Palatal Strap • Anterior Posterior (A-P) Palatal Strap • Palatal Plate • Palatal Bar • U-Shaped (Horseshoe) Palatal Connector

10. Palatal Strap

11. Palatal Strap

13. A-P Bar

14. Palatal bar is defined as being 8mm or less in width. • A palatal strap is greater than 8mm in width • OBVIOUSLY,THIS IS NOT BRAIN SURGERY

15. Palatal Plate

16. Strap or Bar ? Anterior edge should follow contour of rugae

17. A-P Strap or Bars ????

18. Maxillary framework should be 6mm from free marginal gingiva, if this is not possible than the framework should end on teeth.

19. Maxillary Major Connectors • Palatal Strap • Anterior Posterior (A-P) Palatal Strap • Anterior Posterior (A-P) Palatal Bar • Palatal Plate • Palatal Bar • U-Shaped (Horseshoe) Palatal Connector

20. Mandibular Major Connectors

21. Mandibular Major Connectors • Lingual Bar • Lingual Plate • Double Ling Bar (Kennedy Bar) • Labial Bar • Swinglock

22. Mandibular Major Connectors Lingual Plate Lingual Bar

23. The superior border of a lingual bar should be at LEAST 4 mm below the free marginal gingiva.

24. Lingual Bar and Lingual Plate

26. Indications For Use Of A Lingual Plate • For stabilization of periodontally involved teeth. • In Class I situations in which residual ridges have undergone excessive vertical resorption. • When the lingual frenum is high or the space available between the gingival margin and the floor of the mouth is <8 mm. • Lingual bar approximately 4mm + 4mm clearance from free marginal gingiva = 8mm and want no impingement of lingual frenum.

27. Indications for use of a Lingual Plate, continued • When the patient has found a lingual bar objectionable in the past • When the future replacement of one or more incisor teeth will be facilitated by the addition to the lingual plate.

28. Lingual plates must always terminate in a prepared rest seat and never on an inclined surface.

32. Labial Bar

33. Double Lingual Bar or Kennedy Bar

34. Palatal torus U Shaped

35. Swing Lock Major Connector Or Clasp???

36. Mandibular Major Connectors • Lingual Bar • Lingual Plate • Double Ling Bar (Kennedy Bar) • Labial Bar • Swinglock

37. Cast RPD FrameworkComponents • MAJOR CONNECTOR • MINOR CONNECTORS

38. Minor connectors are those components that serve as the connecting link between the major connector and the other components. • Many times a minor connector will be continuous with a lingual or palatal plate rather than a distinct element.

40. Reciprocal Arm Retentive Arm

41. APPLICATION OF CLASP ASSEMBLY TO TOOTH

43. Minor connectors may play a critical role by serving as a connector for indirect retainers that minimize the rotation of free end saddles.

44. An indirect retainer is that part of an RPD that assists the direct retainer in preventing displacement of distal extension denturebases by resisting lever action from the opposite side of the fulcrum line. It is the rest within the rest seat that prevents the displacement.

46. Indirect retention

47. The ideal position for an indirect retainer is at a right angle to the fulcrum and located on the strongest tooth.