steps of rpd construction
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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