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5.full metal crown

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Dr. lama khaled El Banna

Faculty of Oral and Dental Medicine

Al – Azhar University
Fixed prosthodontic

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5.full metal crown

  1. 1. FIXED PROSTHODONTIC I Department of Endodontics Fixed Prosthodontics
  2. 2. The complete cast Crown
  3. 3. 1.Indications, Contra-indications 2.Disadvantages and Advantages of Full Metal Crowns 3.Steps of Tooth preparation
  4. 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. 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.
  6. 6. 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(.
  7. 7. 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
  8. 8. 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.
  9. 9. Visualize Outer Contour Before Cutting Preparation
  10. 10. Depth orientation grooves are placed on the occlusal surface with round end tapered diamond or with Round diamond wheels.
  11. 11. The use of guiding grooves for occlusal reduction is helpful only if the tooth is in good occlusal relationship before preparation.
  12. 12. 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.
  13. 13. The exact number of guiding grooves is vary
  14. 14. Reduction parallels opposing triangular ridges Correct depth (0.8 mm for the central groove and nonfunctional cusps, 1.3 mm for the functional cusps(.
  15. 15. OCCLUSAL REDUCTION 1.5mm of clearance of functional cusp and at least 1.0 mm on the nonfunctional cusp.
  16. 16. After the guiding grooves are placed, the occlusal reduction is performed.
  17. 17. Half the occlusal surface is reduced first so that the other half can be maintained as a reference.
  18. 18. Measure clearance with RGS 3 Instrument fits loosely
  19. 19. 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. A B
  20. 20. Axial Reduction & Chamfer -Axial walls at least 3 mm long. -3-6degree taper between opposing walls. -Chamfer depth from 0.3-0.7 mm. -Follow gingival contours. -Finish line 0.5 mm supragingival.
  21. 21. Line Of Draw -IMAGINARY line -BEFORE preparation is begun -CENTER of all possible paths of withdrawal or seating of the restoration
  22. 22. 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.
  23. 23. 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.
  24. 24. Non Functional Cusp Bevel 0.2-0.3mm wide
  25. 25. The completed preparation is characterized by a smooth, even chamfer; a 6-degree taper; and gradual transitions between all prepared surfaces.
  26. 26. Exact visible finishing line (no undercuts(
  27. 27. 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.
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Dr. lama khaled El Banna Faculty of Oral and Dental Medicine Al – Azhar University Fixed prosthodontic

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