Provisional restorations finalised /certified fixed orthodontic courses by Indian dental academy

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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078

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  • crown selection
    Prepare tooth and determine crown size needed using mold guide provided in crown kit.
    Select appropriate crown and trial fit.
    Crown preparation
    Crown lining
    Crown cementation
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  • Provisional restorations finalised /certified fixed orthodontic courses by Indian dental academy

    1. 1. PROVISIONAL RESTORATIONS INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com 1
    2. 2. A fixed or removable prostheses designed to enhance esthetics, stabilization and /or function for a limited period of time, after which it is to be replaced by a definitive restoration. www.indiandentalacademy.com 2
    3. 3. FUNCTIONS B OGICAL IOL M CH E ANICAL E HT ST E IC www.indiandentalacademy.com 3
    4. 4. BIOLOGICAL Pulpal protection. Maintain periodontal health. Provide occlusal compatibility. Maintain tooth position. Protect against fracture. www.indiandentalacademy.com 4
    5. 5. Pulpal protection The restoration must be fabricated of a material that will prevent. •Conduction of extreme temperatures. •Microbiological infection. •Chemical, mechanical injuries. www.indiandentalacademy.com 5
    6. 6. Periodontal Health •Extent of margins. •Contour. www.indiandentalacademy.com 6
    7. 7. Occlusal compatibility www.indiandentalacademy.com Proper occlusal and proximal contacts promote patient comfort and maintain tooth position. 7
    8. 8. Maintain tooth position Prevent migration and extrusion of the prepared abutment. www.indiandentalacademy.com 8
    9. 9. Protect against fracture www.indiandentalacademy.com 9
    10. 10. MECHANICAL Resist functional loads. Resist removal of forces. Maintain interabutment alignment. www.indiandentalacademy.com 10
    11. 11. ESTHETIC Easily contourable. Color compatibility.  Translucency.  Color stability.  www.indiandentalacademy.com 11
    12. 12. Types of provisional restorations  Prefabricated Metal Anatomic metal crown forms Tin – silver Nickel chromium Stock aluminum cylinders Resin Cellulose acetate Tooth colored poly carbonate crown forms  Custom made www.indiandentalacademy.com 12
    13. 13. Materials IDEAL PROPERTIES 1. 2. 3. 4. 5. 6. 7. 8. Convenient handling Bio compatibility Dimensional stability Ease of contouring and polishing Adequate strength and abrasion resistance Good appearance Good patient acceptance Ease of adding or repairing www.indiandentalacademy.com 13
    14. 14. MATERIALS AVAILABLE Polymethyl methacrylate. Polyethyl methacrylate . Polyvinyl ethyl methyl methacrylate . Bis acryl composite. VLC urethane dimethacrylate. Aluminum. Tin-silver. NiCr. www.indiandentalacademy.com 14
    15. 15. TECHNIQUES DIRECT Provisional restoration is done on the actual prepared teeth in the mouth. INDIRECT Provisional restoration is fabricated outside the mouth on the cast made of quick setting plaster. www.indiandentalacademy.com 15
    16. 16. DIRECT vs INDIRECT TECHNIQUES Direct 1. Intermediate steps of indirect technique are eliminated. 2. Convenient when assistant training and laboratory facilities are inadequate. Indirect 1. No contact of free monomer with the prepared tooth or gingiva, causing damage to the tissue. 2. Better marginal fit. 3. Less chair side work. www.indiandentalacademy.com 16
    17. 17. TECNNIQUE FOR PRE FABRICATED PROVISIONAL RESTORATION POLY CARBONATE CROWNS DIR CT T CH E E NIQUE Select a appropriate sized or slightly larger crown form , and trim the shell to the appropriate size. Try the shell in the prepared mouth. 2. Apply a uniformly thin coat of petroleum jelly on the prepared tooth and surrounding tissues. 1. www.indiandentalacademy.com 17
    18. 18. 3. Mix the auto- polymerizing resin and fill the shell ,place the shell over the tooth and align it. 4. Eliminate any marginal excess. 5. When the polymerization reaches rubbery stage remove the crown and place it in warm water. www.indiandentalacademy.com 18
    19. 19. 6. After the resin had set the margins are marked flash is eliminated ,axial surfaces are shaped , occlusion is checked and adjusted 7. Finally, polish and cement the restoration www.indiandentalacademy.com 19
    20. 20. INDIRECT PROCEDURE When the preparation has been completed make an impression of the prepared mouth, and pour the cast with quick setting plaster. 2. Select a appropriate sized or slightly larger crown form , and trim the shell to the appropriate size. 3. Paint the cast of the prepared tooth and the surrounding area with the separating media. 1. www.indiandentalacademy.com 20
    21. 21. 4. Fill the crown with resin, and seat it on the plaster cast firmly. place it in a bowl of warm water to accelerate polymerization. 5. When the resin is set, remove the provisional crown from the cast, trim the excess , if necessary recontour the axial surfaces ,check the occlusion and adjust it. 6. Finally, polish and cement the restoration. www.indiandentalacademy.com 21
    22. 22. ALUMINUM CROWN FORMS They are useful in restoring a single posterior tooth. PROCEDURE 1. The mesiodistal width of the tooth is measured and appropriate size of the crown is selected. 2. The occluso-cervical height is measured and the crown is trimmed so that it extends 1mm apical to the gingival margin. 3. Crown is placed on the prepared tooth and the margins are trimmed wherever the gingiva blanches. 4. Instruct the patient to close with a moderate force. www.indiandentalacademy.com 22
    23. 23. 5. Apply petrolatum jelly to the pre pared tooth surface and the adjacent tissues. Mix the auto polymerizing resin and fill the crown, place the crown over the tooth. 6. When the polymerization reaches rubbery stage, remove the crown and place it in warm water. 7. After the resin had set the margins are marked, flash is eliminated, axial surfaces are shaped , occlusion is checked and adjusted. 8. Acrylic is added in the deficient parts if any. 9. Finally, polish and cement the restoration . www.indiandentalacademy.com 23
    24. 24. Techniques for custom provisional restorations Over impression fabricated provisional restoration An over impression is made on the diagnostic cast or in the mouth before the tooth preparation had begun. Alginate and elastomeric materials can be used for over impressions. An over impression frequently is made from the patients mouth. www.indiandentalacademy.com 24
    25. 25. If tooth to be restored has any obvious defects the over impression can be made from the diagnostic cast. Utility wax is placed on the defect. Over impression is made from the diagnostic cast. www.indiandentalacademy.com 25
    26. 26. When the tooth preparation is completed impression is made. Quick setting plaster is poured into the impression.. After the plaster sets the cast is retrieved and trimmed . The trimmed cast should have at least one tooth on either side of the prepared tooth. Try the plaster cast into the over-impression. www.indiandentalacademy.com 26
    27. 27. Paint the surface of the prepared tooth and surrounding area on the cast with the separating media. Mix the auto polymerizing resin and place it in the over impression. Seat the cast in the impression. Hold it firmly with a rubber band www.indiandentalacademy.com 27
    28. 28. •After the resin had set the margins are marked, flash is eliminated ,axial surfaces are shaped , occlusion is checked and adjusted •Finally, polish and cement the restoration www.indiandentalacademy.com 28
    29. 29. Over impression fabricated provisional restorations www.indiandentalacademy.com 29
    30. 30. www.indiandentalacademy.com 30
    31. 31. TEMPLATE FABRICATED PROVISIONAL RESTORATION www.indiandentalacademy.com 31
    32. 32. www.indiandentalacademy.com 32
    33. 33. www.indiandentalacademy.com 33
    34. 34. 1. 2. 3. 4. 5. 6. 7. 8. 9. LIMITATIONS OF PROVISIONAL RESTORATIONS Lack of inherent strength. Poor marginal adaptation. Color instability. Poor wear properties. Odor emission. Inadequate bonding characteristics. Poor tissue response to irritation. Arduous cement removal. Time expenditure for fabrication can be prohibitive. www.indiandentalacademy.com 34
    35. 35. CEMENTATION IDEAL PRORERTIES OF LUTING AGENT Ability to seal against the oral fluids. Strength consistent with intentional removal. Low solubility. Blandness or obtundency. Chemical compatibility with the polymer. Easy to dispense and mix. Ease of eliminating excess. Adequate working time and short setting time. Compatibility with definitive luting agent. www.indiandentalacademy.com 35
    36. 36. TECNNIQUE FOR PRE FABRICAT PROVISIONAL RESTORATION POLY CARBONATE CROWNS Seat crown on preparation. Mark gingival contour using a pencil remove the crown and trim 1mm below the line using crown scissors , bur or stone www.indiandentalacademy.com 36
    37. 37. www.indiandentalacademy.com Cervical margins can be crimped, if needed using crimping pliers. Reseat and check fit. 37
    38. 38. Line crown with provisional acrylic or resin material to enhance fit and extend wear www.indiandentalacademy.com 38
    39. 39. www.indiandentalacademy.com Remove from the mouth and trim to finish line using a carbide bur . Smooth and polish as required, using discs and rubber wheel 39
    40. 40. www.indiandentalacademy.com Mix cement and fill crown, assuring voids are not present in the cement. 40
    41. 41. www.indiandentalacademy.com Seat crown and allow cement to set. Remove the excess cement with scaler or explorer. Floss interproximal areas. 41
    42. 42. Temporary metal crowns Crown selection Determine the mesiodistal width. Select appropriate crown. www.indiandentalacademy.com 42
    43. 43. Trial fit For chamfer preparation Press gently to stretch crown cervix over finish line of preparation www.indiandentalacademy.com 43
    44. 44. For shoulder preparation Slightly flare the cervix of crown on the stretch block. Do not over expand. www.indiandentalacademy.com 44
    45. 45. Seat expanded crown on prepared shoulder www.indiandentalacademy.com 45
    46. 46. Crown preparation If gingival blanching occurs during trial fit, trim crown using crown scissors www.indiandentalacademy.com 46
    47. 47. Reset in mouth and have patient establish occlusion www.indiandentalacademy.com 47
    48. 48. Use a sharp explorer to mark the marginal contour. Trim crown back to the line using a crown scissors. Smooth and polish if desired using discs and rubber wheel. and rubber wheel www.indiandentalacademy.com 48
    49. 49. Mix cement and fill crown assuring voids are not present in the cement. www.indiandentalacademy.com 49
    50. 50. Crown cementation Seat the crown and have the patient bit into occlusion. www.indiandentalacademy.com 50
    51. 51. Burnish the cervical margin to the preparation before the cement sets completely www.indiandentalacademy.com 51
    52. 52. Remove excess cement with scaler or explorer. Floss interproximal areas www.indiandentalacademy.com 52
    53. 53. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com 53

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