1. The document discusses the complete cast crown restoration, including its advantages of greater retention and strength compared to other restorations. 2. It indicates the complete cast crown is used for teeth with extensive damage from caries or trauma, or when maximum retention is needed. It also discusses contraindications and tooth preparation steps. 3. Preparation involves placing guiding grooves, reducing the occlusal surface, tapering the axial walls, creating a chamfer, and ensuring adequate clearance and margins. The finished preparation has a smooth, even chamfer and gradual transitions.

1. FIXED PROSTHODONTIC I
Department of Endodontics Fixed
Prosthodontics

2. The complete cast Crown

3. Indications, Contra-indications. 1
Disadvantages and Advantages of Full Metal Crowns. 2
Steps of Tooth preparation. 3

4. Advantages
The complete cast crown has greater retention than a-
.more conservative restoration on the same tooth
A complete cast crown preparation has greater-
resistance from than a partial-coverage restoration on
.the same tooth
The strength of a complete cast crown is superior to-
.that of other restorations

5. Indications
The complete cast crown is indicated on teeth that exhibit-
.extensive coronal destruction by caries or trauma
It is the restoration of choice whenever maximum retention and-
.resistance are needed
On short clinical crowns or when high displacement forces are-
.anticipated
The complete cast crown is indicated on endodontically treated-
teeth. Its superior strength compensates for the loss of tooth
structure that results from previous restorations, carious lesions,
.and endodontic access
The restoration also may be used to support a removable partial-
.denture

7. Contraindications
The complete cast crown is contraindicated if-
treatment objectives can be met with a more
.conservative restoration
A complete crown is not indicated. If a high-
(.esthetic need exists ( e.g., anterior teeth

8. Preparation Steps
The clinical procedure to prepare a tooth for a
complete cast crown consists of the following
:steps
Guiding grooves-
Occlusal reduction-
Axial reduction-
Finishing-

9. Recommended dimensions for a complete cast crown. On functional cusps (buccal
mandibular and palatal maxillary( the occlusal clearance should be equal to or greater
than 1.5 mm. On nonfunctional cusps, a clearance of at least 1 mm is needed. The
.chamfer should allow for approximately 0.5 mm of metal thickness at the margin
.The functional (Centric( cusp bevel will be placed at about 45 degrees to the long axis

10. Visualize
Outer Contour
Before Cutting Preparation

18. Depth orientation grooves are placed on the occlusal surface with round end tapered
.diamond or with Round diamond wheels

19. The use of guiding grooves for occlusal reduction is helpful only if the tooth is in good
.occlusal relationship before preparation

20. Guiding grooves are placed on the occlusal surface. They are deeper on the functional
cusp, and for the functional cusp bevel they diminish in depth from the cusp tip to the
.cervical margin

21. The exact number of guiding grooves is vary

22. Reduction parallels opposing triangular ridges
Correct depth (0.8 mm for the central groove and nonfunctional cusps, 1.3 mm for the
(.functional cusps

24. OCCLUSAL REDUCTION
.mm of clearance of functional cusp and at least 1.0 mm on the nonfunctional cusp 1.5

25. . After the guiding grooves are placed, the occlusal reduction is performed

26. Half the occlusal surface is reduced first so that the other half can be maintained as a
.reference

35. Measure clearance with RGS 3
Instrument fits loosely

40. A
Evaluation of the adequacy of occlusal
clearance. A, The patient closes into softened
wax / silicon. B, The thickness of the wax /
silicon is assessed visually and measured
with a caliper after it has been removed from
.the mouth
B

41. Axial Reduction & Chamfer
.Axial walls at least 3 mm long -
.degree taper between opposing walls 3-6 -
.Chamfer depth from 0.3-0.7 mm -
.Follow gingival contours -
.Finish line 0.5 mm supragingival -

42. Line Of Draw
IMAGINARY line-
BEFORE preparation is begun -
CENTER of all possible paths of -
withdrawal or seating of the restoration

46. Interproximal Reduction
Extend below adjacent tooth contact-
Avoid-
Adjacent tooth damage-
Overtapering -
Excessive axial reduction -
Initial proximal axial reduction
with short needle diamond
followed by the round-end
.tapered diamond

48. Place the cervical chamfer concurrently with axial reduction. Its width should be
approximately 0.5 mm, which will allow adequate bulk of metal at the margin. This
.chamfer must be smooth and continuous mesiodistally

60. Non Functional Cusp Bevel
mm wide 0.2-0.3

66. The completed preparation is characterized by a smooth, even
chamfer; a 6-degree taper; and gradual transitions between all
.prepared surfaces

67. (Exact visible finishing line (no undercuts

79. Complete cast crowns used to restore the molar teeth. The canines and premolars,
which are more visible because of their more anterior arch position, have been restored
.with metal-ceramic crowns