Functional cusp /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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Functional cusp /certified fixed orthodontic courses by Indian dental academy

  1. 1. INDIAN DENTAL ACADEMY Leader in continuing dental education
  2. 2. Functional Cusp Bevel • Round end tapered diamond • 1.5 mm deep are placed on the facioocclusal line angle • No.171 bur is used to plane the area between the grooves and finish the functional cusp
  3. 3. Occlusal Shoulder • No: 171 bur is used to form the occlusal shoulder along the termination line of the functional cusp bevel facially. End cutting bur is used to plane the shoulder (1.0 mm wide).
  4. 4. Lingual Axial Reduction • Torpedo diamond creating a definite chamfer all over. Over inclination of the lingual wall frequently occurs. • Check at all times for over inclination
  5. 5. Proximal Reduction • Initially thin needle diamond is used in sawing motion to just break the contact with the adjacent tooth • Once contact is broken, torpedo diamond is used to create a definite chamfer finish line and complete the axial and proximal reduction
  6. 6. Axial Finishing • Torpedo bur is used to produce a distinct finish line and round of the angles of the preparation.
  7. 7. • Parallel to the incisal two Groove Proximal thirds of the facial surface. • Orientation cut is made using no.170 bur depth 1.0mm or less. • Groove is continued apically to about 0.5mm above the chamfer finish line. • Grooves on mesial and distal side are made parallel to each other.
  8. 8. Proximal • Flame diamond and flame bur is used to produce the facial flares that is a flat geometric plane. When access is good a medium grit sandpaper disc may be used. • The flare is wider at occlusal than at the gingival with a definite finish line. Flares
  9. 9. Facial Bevel • Flame diamond and no: 170 bur is used to bevel the occlusal shoulder.
  10. 10. Completed mandibular posterior three quarter crown preparation Proximal view Occlusal view
  11. 11. Features of the Mandibular Posterior Three Quarter Crowns
  12. 12. Reverse Three – Quarter Crowns
  13. 13. • Complete coverage of facial surface,is used only ocassionally and is usually reserved for one or two situations • It is ideal for restoration of molars that are inclined lingually. • It can also be used on molars that have suffered destruction of the facial surface, but not of the lingual
  14. 14. Maxillary Posterior Seven Eighth Crown
  15. 15. Occlusal Reduction • No. 171 or torpedo diamond is used • Depth orientation grooves are made on the triangular ridges and the developmental grooves 1.0mm on the non functional and 1.5mm on the functional cusp • At the occluso-facial line angle groove is made only 0.5mm deep to minimize the display of metal. • Tooth structure from between the grooves is removed according to cuspal contours
  16. 16. Functional • Done using round end Cusp tapered diamond and no: 171 bur. Depth orientation grooves are placed across the lingual inclines of the lingual cusps. • The bevel should parallel the inward facing inclines of the opposing tooth, at a depth of 1.5 mm usually forming a 45° angle with Bevel
  17. 17. • Facial and Lingual Axial Is done with a torpedo Reduction diamond producing a definite chamfer finish line at the same time. • The lingual reduction is carried as far as possible into the interproximal embrasures with out nicking the adjacent teeth. • The disto axial reduction should end 1.0 mm mesial to facial groove.
  18. 18. • A short thin tapered Axial Reduction Proximal diamond is placed against the lingual surface of the remaining interproximal tooth structure and a sawing motion is used. Continue toward the facial surface until contact with adjacent teeth is barely broken. • Once sufficient space has been produced, a torpedo diamond is used for axial reduction and to produce chamfer finish line.
  19. 19. Axial Finishing • Torpedo bur is used to produce a distinct finish line and round of the angles of the preparation.
  20. 20. Grooves • No: 171 bur is used to prepare a mesial and a facial groove correctly aligned with the path of insertion.
  21. 21. Thank you For more details please visit