Post and core

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Post and core

  1. 1. Post and core some studies have indicated that minimally damaged endodontically treated teeth without posts are more resistant to fracture than teeth restored with posts and cores
  2. 2. Definition Dowel a post, usually made of metal that is fitted • into a prepared root canal of a tooth that • has had endodontic therapy •
  3. 3. Core the coronal aspect of the post foundation
  4. 4. Choice of Restorative Technique for the Endodontically Treated tooth Type of Tooth ( Anterior V.S. Posterior -1 • 2-amount of remaining coronal tooth structure
  5. 5. Case evaluation Endodontic Considerations • Periodontal Considerations • Prosthetic Considerations •
  6. 6. Endodontic Considerations Good apical seal. 1 • No sensitivity to pressure. 2 • No exudate. 3 • No fistula. 4 • No apical sensitivity. 5 • No active inflammation. 6 • Retreatment should occur if there are signs . 7 • or symptoms indicating failure •
  7. 7. Periodontal Considerations Extensive coronal destruction may. 1 • :require Crown Lengthening a.to Re-establish biologic width • b .to Provide coronal tooth structure to • incorporate ferrule into cast restoration •
  8. 8. Ferrule effect 1.5-2mm of coronal tooth structure to achieve resistance form
  9. 9. Prosthetic Considerations Extent of coronal destruction. 1 • Other factors to evaluate. 2 (a. Tooth type (anterior vs. posterior b. Position in arch d. Occlusal and prosthetic forces applied to Tooth
  10. 10. Factors affecting the retention . of prefabricated post restorations POST LENGTH • POST DIAMETER • POST DESIGN • LUTING AGENTS •
  11. 11. POST LENGTH The post should be longer than the. 1 • .crown The post should end halfway. 2 • between the crestal .bone and the root apex • The post should be as long as. 3 • possible without disturbing the apical seal •
  12. 12. Optimal conservative post placement, with appropriate length, width and fit, for a maxillary canine that required a crown due to the amount of lost tooth structure
  13. 13. POST DIAMETER Increasing the diameter of the post does • not provide a significant increase in the • retention of the post ; however, it can ; increase the stiffness of the post at the expense of the remaining • dentin and the .fracture resistance of the root •
  14. 14. Therefore post diameter must be controlled to preserve ,radicular dentin, reduce the potential for perforations and permit the tooth to resist fracture
  15. 15. . .Overly wide post and resultant root fracture
  16. 16. POST DESIGN smooth • Serrated • threaded •
  17. 17. POST DESIGN Prefabricated • Custom made •
  18. 18. POST DESIGN Tapered • Parallel-sided. •
  19. 19. LUTING AGENTS Luting agents, including zinc phosphate, • ,polycarboxylate glass ionomer •
  20. 20. PREPARATION OF THE CANAL SPACE AND TOOTH gutta percha should be- 1 • removed with an endodontic heat carrier • until the desired length is reached. A minimum of 4 • to 5 mm of gutta percha must remain to preserve the • apical seal
  21. 21. root canal reamers can be-2 used to widen the canal space by a reaming action to ensure a relatively round preparation
  22. 22. twist drills are-3 then used to shape the canal
  23. 23. Methods of placement of custom made posts Direct method • Indirect method •
  24. 24. Custom Made Post: Direct Technique
  25. 25. Custom Made Posts: Indirect
  26. 26. Core material Amalgam • Composite • Glass ionomer •

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