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STEPS OF RPD CONSTRUCTION

STEPS OF RPD CONSTRUCTION. STEPS OF CONSTRUCTION. EXAMINATION PRIMARY IMPRESSION POURING PRIMARY CAST PRIMARY SURVEYING MOUTH PREPARATION FINAL IMPRESSION POURING MASTER CAST. SURVEYING THE MASTER CAST DRAW THE DESIGN PREPARING MASTER CAST FOR DUPLICATION DUPLICATION

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STEPS OF RPD CONSTRUCTION

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  1. STEPS OF RPD CONSTRUCTION

  2. STEPS OF CONSTRUCTION • EXAMINATION • PRIMARY IMPRESSION • POURING PRIMARY CAST • PRIMARY SURVEYING • MOUTH PREPARATION • FINAL IMPRESSION • POURING MASTER CAST

  3. SURVEYING THE MASTER CAST • DRAW THE DESIGN • PREPARING MASTER CAST FOR DUPLICATION • DUPLICATION • POURING REFRACTORY CAST • DRAWING DESIGN • MAKE WAX PATTERN AND SPRUE

  4. INVESTING AND CASTING • FINISHING AND POLISHING • METAL FRAMEWORK TRYIN • BITE REGISTRATION • ACRYLIC TEETH TRYIN • PROCESSING OF ACRYLIC • FINISHING AND POLISHING.

  5. Cross Arm with Spindle Housing The Vertical Spindle With Tool Holder Tool Holder Surveyor Vertical Upright Column The Surveyor Table The Horizontal Base

  6. SURVEY LINE NON UNDECUT AREA Carbon Marker UNDERCUT AREA HEIGHT OF CONTOUR

  7. SURVEYED MASTER CAST

  8. PREPARATION OF MASTER CAST Wax Trimmer

  9. Waxing the master cast: • 1- Blocking-out the undesirable undercuts: A- Paralleled blockout: • Proximal tooth surfaces to be used as guiding planes • Beneath all minor connectors • Tissue undercuts to be crossed by rigid connectors • Tissue undercuts to be crossed by origin of bar clasps • Deep interproximal spaces t

  10. B- Shaped blackout • Ledges for location of reciprocal clasp • Ledges for location of retentive clasp arms

  11. C- Arbitrary blockout (Smoothed arbitrarily with wax spatula • All gingival crevices • Gross tissue undercuts • Labial and buccal tooth and tissue undercuts not in­volved in denture design

  12. 2-Relief • Beneath lingual bar • Areas in which major connec­tors will contact, thin tissue • Beneath framework extension onto ridge areas for attach­ment of resin bases • 3-Tissue Stops • Two small squares of 2 mm, usually an anterior and posterior, of relief wax is removed at the distal end the edentulous ridge

  13. 4-Formation of internal finishing lines • are carved in the relief wax covering the edentulous ridge at the metal resin junction. This line is trimmed with blade held at 900 to the cast surface in order to produce a sharp junction having a uniform depth of at least 1mm.

  14. Duplicating flask opened closed

  15. Duplication of the master cast

  16. REFRACTORY CAST

  17. PENCIL OUTLINE ON CAST

  18. WAX FRAMEWORK

  19. FILLING OF BEADED AREAS

  20. LAYING SHEET OF WAX

  21. SHEET CUT TO SHAPE

  22. SECOND HALF ADAPTED

  23. SECTIONS SEALED TOGETHER

  24. POSITION MESHWORK IN PLACE

  25. MESHWORK IS TRIMMED

  26. FINISH LINE

  27. FINISH LINE

  28. LEDGE IN REF. CAST

  29. ADAPTATION OF WAX IN LEDGE

  30. RETENTIVE ARM IN LEDGE

  31. RECOPRICAL ARM IN PLACE

  32. FILLING OCCLUSALREST WITH WAX

  33. FINISHED OCCLUSAL REST

  34. CLASP UNIT ATTACHED TO FRAMEWORK

  35. GINGIVALLY APPROACHING CLASP

  36. OCCLUSAL REST CONNECTED TO MINOR CONNECTOR

  37. DISTAL PROXIMAL PLATE

  38. FINISHED WAX FRAMEWORK

  39. WAX PATTERN

  40. WAX PATTERN SPRUED

  41. SECTIONAL VIEW OF WAXING, INVESTING AND SPRUE

  42. CASTING AND METAL INGOTS

  43. FINISHED AND POLISHED R.P.D

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