6. Temporary crown prep
Mock prep
Putty index
Diagnostic wax up
Diagnostic mounting
Diagnostic impression
Temporary crown
cementation
Master impression
Gingival retraction
Tooth prep in pt
7. Permanent cementation
Glazing
Ceramiv build up
Oxide layer formation
Casting
Investment
Sprue former
Wax pattern
Die lubricant
Die spacer
Die hardener
Diching
Removable die
Triming
Base
Die pins
Pindex
Working cast
Master cast
8. Die :- It is the positive reproduction of the form of
the prepared tooth in any suitable substance.
Cast :- A life-size likeness of some desired form. It
is formed within or is a material poured into a
matrix or impression of the desired form
Die pin:- A metal pin used in stone casts to
remove die sections and replace them accurately
in the original position
9. Dowel pin (GPT 8): a metal pin used in stone casts to remove
die sections and replace them accurately in the original position
Straight Curved
Conventional dowel pin systems
10. Straight dowel pins
Flat sided
dowel
Double straight
dowel with
common head
(Bi pin)
Rounded single
dowel pin
BI-PIN with case BI-FIXED-pin
Doubles straight dowel
with fixing wire for
accurate positioning
in impression
10
11. Working cast
•The replica of the prepared teeth, ridge areas
& other parts of dental arch
Refractory die
•A die made of material that will withstand high
temperatures with out disintegrating
12. MATERIALS USED FOR MAKING DIES
NON METALLIC METALLIC
• Gypsum materials
• Cements(Silicophospate cement)
• Refractory die materials
• Polymers (epoxy resin, polyurethane)
• Electroformed dies
• Amalgam
• Sprayed metals
13. ADA TYPE 4
stone
•Dimensional
accuracy Most
situations
Accurate
proportioning
Eessential
• Straight
forward
Technique
• Low cost
Low abrasion
resistance
ADA TYPE 5
stone
•Straight forward
technique Increased
expansion
Base metal alloy
situations
Accurate
proportioning
essential
• Low cost
•Improved strength
than type4
Materials Advantages Disadvantage Use Precaution
13
NON METALLIC
14. Materials Advantages Disadvantage Use Precaution
Electroplating High strength
Good abrasion
resistance
•Time
consuming
Complete
ceramic
crowns
•Silver uses
toxic cyanide
•Incompatible
with many
impression
materials
Amalgam •High strength
•Good abrasion
resistance
• low setting
time
• high thermal
conductivity(
wax pattren
will cools
fast-
distertion)
Complete
ceramic
crowns
METALLIC
16. Die Hardener
• Materials applied on the surface of die to
increase the surface hardness.
• Should have low viscosity
• Commonly used materials as die
hardeners:
Cyanoacrylate resins (Eg: Premabond)
Acrylic resin lacquer (Eg: Die Prep die hardener)
• Optimal Thickness 2-3 mm, but if not properly
manipulated10 mm
16
17. Die Spacer :-
An agent applied to a die to provide space for the
luting agent in the finished casting.
Types of die spacers :
• Resins
• Paint or liquids
• Model paint
• Coloured nail polish
• Thermoplastic resins dissolved in volatile solvents.
17
18. Should be applied
0.5-1mm short of margin
Brush strokes in one direction
Wait for 2 mins before
applying next coat
• Optimal thickness:-20-40 micro meter
18
19. die lub
Die Separator
The lubricants or die separators which can be used to
prevent wax from adhering to stone are oils, liquid soap,
detergents and a number of commercially available
preparations.
19
21. Die systems
Working cast with
separate die
Working cast with
removable die
Without die pins With die pins
Pre pour technique Post pour technique
21
22. Working cast with separate die
Method of
Simplest
fabrication
between
Advantages:
• Easy to fabricate
Keeps relation
abutments fixed.
• Better contours and
emergence profile while
wax pattern fabrication. 22
23. WORKING CAST WITH REMOVABLE DIE
Advantage:
Convenient to use
Various drawback of separate die are
overcome
Disadvantage:
Risk of introducing error in the
pattern if die does not seat accurately
in the working cast
23
24. WORKING CAST WITH REMOVABLE DIE
working cast with die pins preformed plastic trays
working cast without die pins
24
