The document discusses different techniques for creating working casts with removable dies, including straight and curved dowel pins, pindex systems, and Di-Lok trays. Removable dies allow the fabrication of wax patterns on individual teeth and must return to their exact positions to ensure accurate articulation. Proper die preparation, such as trimming without reducing access or altering contours, is important for producing casts that facilitate wax pattern fabrication.

3. WORKING CAST
 is the cast that is
mounted on an
articulator. To provide
the most accurate
articulation, it
normally should
represent the entire
arch

4. REQUIREMENTS FOR GOODREQUIREMENTS FOR GOOD
CASTSCASTS
 1. bubble free1. bubble free
 especially along the finish lines of theespecially along the finish lines of the
prepared teeth.prepared teeth.
 2. distortion free.2. distortion free.
 3. trimmed3. trimmed
 to insure access for carving wax patternto insure access for carving wax pattern
margins.margins.

5. WORKING CAST WITH A
SEPARATE DIE

6. WORKING CAST WITH A SEPARATE
DIE
 disadvantages
 wax pattern must be transferred from one to the
other
 internal adaptation
 obtained from
 separate impressions
 pouring an elastomeric full-arch impression twice
 first cast is used for fabrication of the die

7. IMPRESSION POURING

8. DIE PREPARATION
Stone is added Tray is tilted

9. DIE PREPARATION
Stone is added to the
impression
The die is first trimmed on
a model trimmer

10. DIE PREPARATION
handle is slightly larger
than preparation. Improperly trimmed die

11. DIE PREPARATION
The handle should be 1 inch
long
The die is trimmed with an
acrylic bur.

12. DIE PREPARATION
Shaping near the finish
line with a scalpel
The die is with the discoid
end of a Tanner carver

13. ERROR !!!
This die is too short, and it does not
allow adequate access for margin
finishing.

14. DIE CONTOURS SHOULD BE
SIMILAR TO THOSE OF A NATURAL
TOOTH

15. DIE PREPARATION
Axial contours of the wax
pattern are influenced by
die trimming.
finish line on die outlined
with a redred pencil.

16. DIE PREPARATION
Die relief agent One-piece die

17. WORKING CAST WITH A
REMOVABLE DIE

18. IF A REMOVABLE DIE SYSTEM IS
USED, IT SHOULD SATISFY THESE
REQUIREMENTS17
 The dies must return to their exact original
positions.
 2. The dies must remain stable, even when
inverted.
 3. The cast containing the dies must be easy to
mount on an articulator

19. WORKING CAST WITH A
REMOVABLE DIE
 Most of these devices
can either be oriented
in the impression
before it is poured
 attached to the
underside of a cast
that has already been
poured
prepour technique post-pour technique

20. WORKING CAST WITH A
REMOVABLE DIE
 1. Straight dowel pin
 2. Curved dowel pin
 3. Pindex system
 4. Di-Lok tray
 5. Accutrac

21. TYPESOFANTIROTATIONAL
DEVICESUSEDFORREMOVABLE
DIES
A, flat-sided
single
dowel;
B, single
curved
dowel;
C, double
straight
dowels with
a common
head;
D, two
separate
parallel
dowels;
E, keyed
plastic outer
tray

22. STRAIGHT DOWEL PIN
Dowel pins positioned
over the impression
Paper clips are added to
nonremovable parts

23. The stone around the
dowel pins is lubricated
paper towel used to fill in
the open, center portion

24. Wax at the ends of the
dowel pins is removed
Dies are separated from
the rest of the cast

25. the ends of the dowel
pins are tapped to loosen
Base of die is trimmed
with an acrylic bur.

26. Dies are reseated into the
cast
wax is removed from the
ends of the dowel pins.

27. PART 2

28. ANY QUESTION ?

29. CURVED DOWEL PIN

30. curved dowel (A),
positioning bar (B),
straight pins (C)
first pour of die stone
(D) to the impression
Depressions are made
about 2.0 mm deep on
either side of the
dowels in the two large
segments of the cast
that will carry the
unprepared teeth
CURVED DOWEL PIN

31. coat of petrolatum is
applied to stone & dowels
Boxing wax with the tips
of the dowels sticking
CURVED DOWEL PIN

32. CURVED DOWEL PIN
The completed cast is
sawed
Segment is removed by
pressing on the exposed tip

33. CEMENTED CURVED PIN

34. CEMENTED CURVED PIN
The working cast is trimmed
to receive cemented dowels
Holes are drilled into the underside of
the cast, under the indicated locations

35. CEMENTED CURVED PIN
The cast is keyed with a
large acrylic bur
cyanoacrylate cement

36. CEMENTED CURVED PIN
The head of a curved
dowel is seated
saw cuts after the base is
poured

37. PINDEX SYSTEM

38. PARTS OF THE PINDEX MACHINE.

39. PINDEX SYSTEM
sufficient stone to allow
for trimming is added
The bottom of the cast is
trimmed

40. PINDEX SYSTEM
The cast should be 15 mm
thick
The periphery of the cast
is trimmed

41. PINDEX SYSTEM
The palate/tongue area
is trimmed
Location of the pin holes
is marked with a pencil

42. PINDEX SYSTEM
Pencil marks are placed
under illuminated dot
The thumbs are used to
stabilize the cast while
lifting the handle bar
with the fingers.

43. PINDEX SYSTEM
 Debris is removedDebris is removed  pin holes refinedpin holes refined
 Shorter pins 1stShorter pins 1st Cyanoacrylate cementCyanoacrylate cement

44. PINDEX SYSTEM
 White sleeves > long pinsWhite sleeves > long pins  bottom of cast is lubricatedbottom of cast is lubricated
 Utility wax > long pins.Utility wax > long pins. gray sleeves are blockedgray sleeves are blocked

45. PINDEX SYSTEM
 A palatal/tongue fillerA palatal/tongue filler  The filler is placed on theThe filler is placed on the
castcast
 Boxing waxBoxing wax The filler is seated to theThe filler is seated to the
castcast

46. PINDEX SYSTEM
 Microstone is pouredMicrostone is poured  The base former filledThe base former filled
 Model seated to base formerModel seated to base former Stone is vibrated on bottomStone is vibrated on bottom

47. PINDEX SYSTEM
 Wax over the long pins isWax over the long pins is
removed.removed.
 The sawThe saw cuts are premarkedcuts are premarked
 Dies are sectioned from theDies are sectioned from the
undersideunderside
 The cast is removed by tappingThe cast is removed by tapping
the pinsthe pins

48. PINDEX SYSTEM
Dies may also sectioned from
the occlusal
A large condenser also be
used to loosen
cast should be poured in a U
shape, no stone in the center.
The completed cast on the
articulator

49. PINDEX SYSTEM
The lingual side of the cast base
is trimmed with an arbor band.
Horizontal grooves are cut in
the base to give it retention

50. DI-LOK TRAY

51. DI-LOK TRAY
The cast is placed into stone
in the tray
Disassembly of the cast.
A saw cut is made on each
side of the prepared tooth
The cast is loosed by tapping
on the front of the base

52. DI-LOK TRAY
The prepared tooth is broken
free from the cast
die is trimmed
The cast and tray mounted on
the articulator
The cast and die(s) are
reassembled in the tray

54. ‫دندان‬ ‫مارژین‬ ‫که‬‫ک‬‫ک‬ ‫کورتی‬‫ک‬‫ص‬ ‫در‬‫دندان‬ ‫مارژین‬ ‫که‬‫ک‬‫ک‬ ‫کورتی‬‫ک‬‫ص‬ ‫در‬
‫مجاور‬ ‫دندان‬ ‫به‬ ‫خورده‬ ‫تراش‬‫مجاور‬ ‫دندان‬ ‫به‬ ‫خورده‬ ‫تراش‬
‫دای‬ ‫تکنیک‬ ‫کدام‬ ‫کد‬‫ک‬‫باش‬ ‫کک‬‫ک‬‫نزدی‬‫دای‬ ‫تکنیک‬ ‫کدام‬ ‫کد‬‫ک‬‫باش‬ ‫کک‬‫ک‬‫نزدی‬
‫؟‬ ‫دارد‬ ‫ترجیح‬‫؟‬ ‫دارد‬ ‫ترجیح‬