1. WAX PATTERN FABRICATION FOR FPD
dr shabeel pn

2. INTRODUCTION
USUALLY WAX PATTERN FABRICATION DENOTES THE WAX PATTERN FABRICATED TO CAST METAL OR CASTABLE GLASS CERAMICS (DICOR). WAX PATTERN FABRICATION INVOLVES THREE MAJOR STEPS NAMELY FABRICATION OF THE RETAINER,THE PONTIC AND CONNECTOR

3. FABRICATION OF THE RETAINER WAX PATTERN
THE METHOD OF FABRICATION OF THE RETAINER COMPONENT WILL VARY ACCORDING TO THE MATERIAL USED AND THE DESIGN OF THE RESTORATION

4. DIRECT TECHNIQUE
WAX PATTERN IS FABRICATED DIRECTLY OVER THE PREPARED TOOTH IN THE ORAL CAVITY
DONE WITH TYPE-I WAX,HENCE NOT USED FOR FIXED PARTIAL DENTURE PATTERN

5. 2. INDIRECT TECHNIQUE ADVANTAGES:
PATTERN IS FABRICATED OVER THE PREPAIRED TOOTH IN THE DIE OR CAST
MADE USING TYPE-II WAX
ADVANTAGES:
DONE IN THE LAB THEREBY REDUCING THE CHAIRSIDE TIME
DONE BY TECHNICIAN THEREBY REDUCING WORK LOAD OF DENTIST
ALLOWS BETTER VISUALISATION OF THE MARGINS OF THE RESTORATION ESPECIALLY FROM THE GINGIVAL ASPECT

6. PROCEDURE
FABRICATED BY PREPARING A WAX COPING FOLLOWED BY ADDING LAYERS OF WAX TO BUILD UP AXIAL AND OCCLUSAL CONTOUR

7. COPING PREPARATION PROCEDURE
SURFACE CONTOURING AND MARGINAL FINISH ARE NECESSARY FOR ALL METAL OR DICOR CERAMIC RETAINER
IN METAL CERAMIC RETAINER COPING IS ALONE PREPARED AND CASTED USING METAL CERAMIC ALLOY
THE COTOURS AND MARGINS ARE DIERECTLY PREPARED USING CERAMIC AND FIRED

8. COPING PREPARATION DONE USING WAX OR HEATED SHEET OF RESIN
WAX COATED ON THE TOOTH USING A WAX SPATULA OR BY DIPPING THE DIE INTO THE HOT WAX

9. WHILE ADDING NEW LAYERS OF WAX THE PREVIOUS LAYER SHOULD BE MELTED TO AVOID FORMATION OF VOIDS
COPING SHOULD BE WAXED IN EXCESS MESIALLO DISTALLY TO PRESERVE PROXIMAL CONTACT

10. PREPARING THE AXIAL CONTOURS
ESTABLISHING THE PROXIMAL CONTACT
USUALY THE PROXIMAL CONTACT OCCUR AT HE OCCLUSAL THIRD WHEN VIEWED FROM SIDE
PROXIMAL CONTACT SHOULD BE FACIALLY LOCATED WHEN VIEWED OCCLUSALLY

11. CONTACT AREA SHOULD BE OPTIMUM

12. AXIAL SURFACE BELOW THE CONTACT SHOULD NEVER BE CONVEX
LINGUAL PROMINENCE IS GREATER FOR MANDIBULAR POSTERIORS THAN MAXILLARY POSTERIORS

13. HEIGHT OF CONTOUR ON THE LINGUAL SURFACE MAXILLARY POSTERIORS OCCUR IN CERVICAL THIRD AND THE SAME IN MANDIBULAR POSTERIORS OCCUR IN MIDDLE THIRD

14. PREPARING THE OCCLUSAL CONTOUR OR DEVELOPING OCCLUSAL MORPHOLOGY
IT SHOULD BE IN HARMONY WITH ADJUSENT OR OPPOSITE TEETH
P.K. THOMAS CARVERS ARE USED TO CARVE THE OCLUSAL SURFACE
PROCEDURE:
TAIL END OF PKT CARVER SHOULD BE USED TO BUILT CONES OF WAX OVER THE AREAS WHERE THE CUSPS ARE TO BE FORMED

15. MARGINAL RIDGES AND CUSP RIDGES ARE BUILT USING SAME INSTRUMENT
PARTIALY WAXED OCCLUSAL SURFACE IS OCCLUDED AGAINST THE OPPOSING CAST

17. INTERNAL INCLINES OF THE CUSP ARE CONTORED
RIDGES SHOULD BE CONVEX
OCCLUSAL MORPHOLOGY SHOULD BE MODIFIED ACCORDING TO SURROUNDING TEETH

18. FINISHING THE MARGINS OF THE PATTERN
MARGINS ARE FINISHED TO A FINE EDGE USING BURNISHER
A COTTON PELLET SOAKED IN DIE LUBRICANT IS USED TO FINISH THE OCCLUSAL GROOVES

19. THE AXIAL SURFACE IS FINISHED WITH A COTTON ROLL DIPPED IN A DIE LUBRICANT
REMOVE THE LUBRICANT AFTER FINISHING

20. PONTIC FABRICATION
FABRICATION OF WAX PATTERN FOR METAL CERAMIC AND RESIN VENEERED PONTICS :
PROCEDURE :
AXIAL SURFACES ARE CONTOURED AS DESCRIBED FOR A RETAINER
INLAY WAX IS SOFTENED AND FUSED TOOTH RETAINER IN THE FORM OF A CYLINDER

21. WAX CONE SHOULD BE PLACED ON THE FLAT OCCLUSAL SURFACE INORDER TO CONTOUR THE OCCLUSAL SURFACE
THE RETAINER PATTERNS ARE FINISHED AND THE PROXIMAL AND THE GINGIVAL SURFACE OF THE PONTIC ARE CONTOURED ACCORDING TO THE NEIGHBOURING TEETH

22. GINGIVAL SURFACE IS CONTOURED ACCORDING TO DESIGN OF THE PONTIC

24. THANK YOU
THANK YOU
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