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Flares in dental crown preparation /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 ,or call

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  • 1. INDIAN DENTAL ACADEMY Leader in continuing dental education
  • 2. Flares • A flame diamond and carbide bur is used to make the mesial and facial flares which are narrow at the gingival end and wider occlusally.
  • 3. Occlusal • No: 171 bur is used Offset to produce a 1.0 mm wide ledge on the lingual incline of the facial cusp connecting the grooves, assuming the shape of an inverted V. Its floor is perpendicular to the path of insertion
  • 4. Occlusal Finishing Bevel • A flame diamond or no: 170 bur is used for creating an occluso facial finishing bevel. The bevel is rounded up to the proximal occlusal line angle to blend with the proximal flares.
  • 5. Completed seven eigth crown preparation
  • 6. Features of the Seven-Eighth Crown Preparation
  • 7. Proximal Half Crowns
  • 8. • Round end tapered Occlusal Reduction diamond and no: 171 bur. • Depth orientation grooves on the distal aspect of the occlusal surface 1.5mm deep. Since the mesial segment of the tooth is dropped below the occlusal plane the grooves may not be as deep. • The tooth structures between the orientation grooves are removed
  • 9. Functional • Is done using roundCusp Bevel end tapered diamond and no: 171 bur. Depth orientation grooves are placed across the facial occlusal line angle of the mandibular molar. The bevel will be shorter and shallower on the mesial cusp than on the distal.
  • 10. • Torpedo diamondAxial Reduction Mesial is used for the axial reduction by making the path of insertion of mesial surface parallel with the long axis of the premolar abutment. • The end of the diamond will eventually make contact with the tooth in the gingival area of the mesial surface and produce a chamfer finish line.
  • 11. Facial and Lingual Axial Reduction • Is done with a tropedo diamond producing a definite chamfer finish line at the same time. End the extension 1.0 mm or more mesial to the distofacial embrasure.
  • 12. Axial Finishing • Torpedo bur is used to produce a distinct finish line and round of the angles of the preparation.
  • 13. Occlusal Isthmus and Countersink • No: 171 bur is used to make an occlusal isthmus and a countersink in the distal fossa to supplement retention, resistance and structural durability.
  • 14. Facial and Lingual • No: 171 bur is used to make parallel grooves on the facial and lingual surfaces with in 1.0 mm of the vertical distal extension of preparation. • The grooves should be parallel to the mesial surface of the tooth and the long axis of the other abutment. Grooves
  • 15. Distal Occlusal Offset • A V-shape offset 0.5 to 1.0 mm from the distal occlusal finish line connecting the lingual groove to the countersink to the facial groove is made using no: 171 bur.
  • 16. Flares and • A flame diamond is Occlusal used to place flares distal to the facial and lingual grooves. • A bevel is cut along the distal marginal ridge with the flame diamond taking care not to extend into the distal occlusal embrasure. Bevel
  • 17. Completed proximal half crown preparation
  • 18. Features of the Proximal Half Crown Preparation
  • 19. Five-Eighths Crown  The five-eighths veneer crown restoration is less frequently used than those preparations previously described. FINISH BEVEL COUNTER SINK  It is indicated where a single proximal surface of a maxillary molar tooth is involved and occlusal and lingual coverage is indicated due to involvement of these areas.  It provides a more conservative design for single tooth restorations and abutment preparations for short FLARE LINGUALGROOVE MAXILLARY MOLAR
  • 20. REVIEW OF LITERATURE • Anthony H.L Tjan et al (1979) have discussed the functions of grooves and offset of a three quarter crown and the types of groove flare design possible. They have established a practical guide to planing the grooves on a three quarter crown which fulfills biologic, mechanical & structural requirements.
  • 21. • Mitsuo Kishimoto et al (1983) studied the retention and resistance of four variations of three quarter crown variations. Preparation with boxes or four grooves were found to be the most retentive of three quarter crowns used in the study. Lingual placement of proximal groove enhanced retention. Three quarter crowns with V shaped had least resistance.
  • 22. • Shillingburg HT Jr.(1976). Partial veneer crowns still play a role in modern restorative dentistry. • They must be used in the right situation with thoughtful treatment planning, and they must be done well in accordance with certain principles. • Three-quarter crowns are less retentive than full crowns, but they can be used successfully as single unit restorations and retainers for short span bridges. Retention can be enhanced by the use of proximal boxes.
  • 23. • Potts RG, Shillingburg HT Jr, Duncanson MG Jr. (1980). Five preparation designs were tested for retention and resistance. • Retention values for all partial veneer crowns were significantly lower than those for the complete veneer crown. • Resistance values increased significantly with the addition of grooves and/or extension of axial surface coverage. • Addition of grooves and/or extension of axial surface coverage produced small increases in retention values but marked increases in resistance values
  • 24. Conclusion Tooth preparation for the various types of partial veneer crowns was described. • Although retention and resistance of partial veneer crowns is less but the conservative design makes them a restoration of choice wherever possible. Addition of retentive grooves and other features increases the retention and resistance; still it remains less than the complete coverage crown. • A thorough clinical and radiographic diagnosis and treatment planning is an utmost need for long term success of the restoration. •
  • 25. REFERENCES • • • • Fundamentals of fixed prosthodonticsH.T.Shillingberg Contemparary fixed prosthodonticsS.F.Roseintiel. Tylman’s theory of practice of fixed prosthodontics. Fundamentals of tooth preparations -H.T.Shillingberg, Jacobi, Brackett
  • 26.  Tjan AHL and Miller GD. Biometric guide to groove placement on three quarter crown preparations. J Prosthet Dent. 1979; 42: 405-410.  Kishimoto M, Shillingburg T, and Duncanson MG. Influence of preparation features on retention and resistance. Part II: Three quarter crown. J Prosthet Dent. 1983; 49: 188-192.  Shillingburg HT Jr. Conservative preparations for cast restorations. Dent Clin North Am. 1976 Apr; 20(2):25971.  Potts RG, Shillingburg HT Jr, Duncanson MG Jr Retention and resistance of preparations for cast restorations.J Prosthet Dent. 1980 Mar; 43(3):303-8.
  • 27. Thank you For more details please visit