steps of rpd construction

STEPS OF RPD CONSTRUCTION

STEPS OF CONSTRUCTION

1. EXAMINATION

2. PRIMARY IMPRESSION

3. POURING PRIMARY CAST

4. PRIMARY SURVEYING

5. MOUTH PREPARATION

6. FINAL IMPRESSION

7. POURING MASTER CAST

8. SURVEYING THE MASTER CAST

9. DRAW THE DESIGN

10. PREPARING MASTER CAST FOR DUPLICATION

11. DUPLICATION

12. POURING REFRACTORY CAST

13. DRAWING DESIGN

14. MAKE WAX PATTERN AND SPRUE

15. INVESTING AND CASTING

16. FINISHING AND POLISHING

17. METAL FRAMEWORK TRYIN

18. BITE REGISTRATION

19. ACRYLIC TEETH TRYIN

20. PROCESSING OF ACRYLIC

21. FINISHING AND POLISHING.

Surveyor

The Horizontal Base

Vertical Upright Column

Cross Arm with Spindle Housing

The Vertical Spindle With Tool Holder

The Surveyor Table

Tool Holder

SURVEY LINE

UNDERCUT AREA

NON UNDECUT AREA

HEIGHT OF CONTOUR

Carbon Marker

SURVEYED MASTER CAST

PREPARATION OF MASTER CAST

Wax Trimmer

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

B- Shaped blackout Ledges for location of reciprocal clasp

Ledges for location of retentive clasp arms

C- Arbitrary blockout (Smoothed arbitrarily with wax spatula

All gingival crevices Gross tissue

undercuts Labial and buccal

tooth and tissue undercuts not in volved in denture design

2-Relief Beneath lingual bar Areas in which major

connec tors will contact, thin tissue

Beneath framework extension onto ridge areas for attach ment 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

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.

Duplicating flask

opened closed

Duplication of the master cast

REFRACTORY CAST

PENCIL OUTLINE ON CAST

WAX FRAMEWORK

FILLING OF BEADED AREAS

LAYING SHEET OF WAX

SHEET CUT TO SHAPE

SECOND HALF ADAPTED

SECTIONS SEALED TOGETHER

POSITION MESHWORK IN PLACE

MESHWORK IS TRIMMED

FINISH LINE

FINISH LINE

LEDGE IN REF. CAST

ADAPTATION OF WAX IN LEDGE

RETENTIVE ARM IN LEDGE

RECOPRICAL ARM IN PLACE

FILLING OCCLUSALREST WITH WAX

FINISHED OCCLUSAL REST

CLASP UNIT ATTACHED TO FRAMEWORK

GINGIVALLY APPROACHING CLASP

OCCLUSAL REST CONNECTED TO MINOR CONNECTOR

DISTAL PROXIMAL PLATE

FINISHED WAX FRAMEWORK

WAX PATTERN

WAX PATTERN SPRUED

SECTIONAL VIEW OF WAXING, INVESTING AND SPRUE

CASTING AND METAL INGOTS

FINISHED AND POLISHED R.P.D

METAL FRAME WORK

FINISHED DENTURE