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  2. 2. Proper occlusal and proximal contactsto promote patientcomfort andmaintain toothposition.
  3. 3. Proper occlusal and proximal contactsto promote patientcomfort andmaintain toothposition.
  4. 4.  The placement of an interim covering on a tooth after preparation is a biologic mandate to maintain vitality. There are three major problems commonly associated with the clinical fabrication of temporary crown:
  5. 5. 1. The time involvement necessary for the fabrication of adequate interim tooth coverage is underestimated by the majority of the dentists.
  6. 6. 2. Treatment coverage is not always replaced by permanent restorations within the shortest possible time.
  7. 7. 3. There are presently no inexpensive, tissue compatible materials that are fabricated by the dentist.
  8. 8. ***One possible measure to combat these problems is to increase the length of the appointments to prevent hastily constructed treatment restoration. Another is to program and coordinate appointment dates with lab services to accelerate the date of insertion of the final restorations.
  9. 9. 8 Cardinal Requirements forTemporization: 1. The pulp of the tooth must be insulated from all forms of adverse stimuli. 2. Arch position of the prepared teeth should be maintained and stabilized to prevent extrusion of teeth and promote the accuracy of the impression.
  10. 10. 3. Treatment restorations should not impinge the gingival tissues causing inflammation and tissue recession.4. It should appear reasonably esthetic, particularly in the incisor and premolar areas.
  11. 11. 5. Treatment restorations should develop occlusal function to assist in the establishment of a satisfactory maxillo- mandibular relationship.6. It should also possess sufficient inherent strength to withstand light forces of occlusion.
  12. 12. 7. It should be fabricated in such a manner to permit the patient to keep the area clean and serve as a healing matrix to tissues surrounding prepared teeth and edentulous areas.
  13. 13. 8. Construction techniques should be within the realm of the average dentist and also capable of being easily removed with minimal damage to the teeth and supportive tissues.
  14. 14. Types of TemporaryCrowns: Metal (precious and non- precious) and Non-metal Materials
  15. 15.  Extensively Nickel- damaged Chromium primary teeth crown May be applied to secondary teeth but are more suitable to primary teeth Very hard
  16. 16. Aluminum shell Restricted to PM and M area crown Possess a consis- tency that permits a definite amount of molding to a px’s occlusion, but lacks NON-ANATOMIC the rigidity for ANATOMIC acceptable marginal strength and proximal contacts
  17. 17.  Employed primarily Preformed in the posterior teeth commercial metal Excessive irritation crown or recession can be prevented by contouring of the gingival margins Time saving aspect is the most attractive feature of this type of temporary crown
  18. 18. Cellulose acetate crown form Cellulose acetate crown form consists of thin, soft, and transparent material. Sizes and shape can be selected from a mold guide. The crown form is trimmed and festooned to fit the preparation without impingement on the soft tissue.
  19. 19. Preformed polycarbonate anteriors Polycarbonate crown forms are more tolerable, selected to establish contact areas***Polycarbonate crown form remains on the prepared tooth, whereas the cellulose crown matrix is removed prior to cementation.
  20. 20.  Used when multiple preparations are Heat-cured resins involved for bridges Teeth are reduced on a 2nd set of dx casts to simulate tooth prep, places the desired occlusion and contact areas on mounted models Wax is boiled off and heat-cured temporaries are fabricated Need only slight modification prior to interim cementation
  21. 21. Cold-cure alginate impression technique An alginate  After the prep., resin impression of the mixture is placed on teeth is taken on the alginate the day of the impression preparations are corresponding to the made but before crown prep. any reduction of  Alginate impression teeth with the resin mixture is placed back into Alginate impres- the mouth sion is set aside  Impression is and kept in a damp removed just prior to environment to the rigid set of the prevent excessive acrylic distortion
  22. 22.  Stone models of Template both arches are used prior to mouth technique prep. Constructed with the aid of a thermal vacuum machine that adapts a plastic sheet over the entire stone cast Plastic sheet is trimmed around the teeth to be prepared
  23. 23.  A wire or non-precious metal post is adapted to the canal. The Post-crown selected crown form is then filled with an technique acrylic resin and placed over the post, including a portion of the radicular surface of the tooth. After sufficient polymerization has taken place, the crown is removed along with the temporary post, which is set within the resin
  24. 24. Limitations of Temporization:  Lack of inherent strength  Poor marginal adaptation  Color instability  Poor wear properties  Inadequate bonding characteristics  Poor tissue response to irritation  Arduous cement removal  Detectable odor emission
  25. 25. Uses of Temporary Crowns 1. Serves as a healing matrix for the gingival tissue 2. Serve as a predictor of the final result 3. Serve as an oral hygiene training device
  26. 26. 4. Provide security and comfort to the patient while the final restoration is being fabricated.5. Saves considerable time at each subsequent appointment, during which castings are fitted, joints are soldered and porcelain is adapted prior to the final delivery
  27. 27. Make the necessary adjustmentsTry in of temporary crown Polish the crown before cementation