Principles of tooth 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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Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy

  1. 1. INDIAN DENTAL ACADEMY Leader in continuing dental education
  2. 2. Fixed Partial Dentures
  3. 3. CLASSIFICATION OF CROWNS 1.according to materials  Complete cast crown (full metal)  Metal ceramic crown  all ceramic crown (metal free ceramic) 2.according to surfaces covered  Full veneer crown  Partial veneer crown
  4. 4. Inlay Crown vs
  5. 5. • An inlay depends on internal retention to hold it within the preparation
  6. 6. • A crown depends • on external retention to resist removal External retention is provided by approximation of the restoration to the opposing external axial walls of the preparation
  7. 7.
  8. 8. Biomechanical principles of Tooth preparation 1. Preservation of tooth structure 2. Retention and resistance form 3. Structural durability of the restoration 4. Marginal integrity 5. Preservation of the periodontium
  9. 9. Preservation of tooth structure  Do not remove excess of tooth structure , do not over taper  Tooth becomes weak  Pulp health gets jeopardised  Reduction must be adequate , less reduction will lead to overcontoured restoration
  10. 10. Two plane reduction for central incisors
  11. 11. Two plane reduction on buccal aspect of mandibula r molar
  12. 12.
  13. 13. •
  14. 14. • Retention is enhanced by restricting the paths of insertion • A—multiple paths of insertion and removal , decreased retention • B---additon of parallel sided grooves limits path of insertion to one direction , increases retention
  15. 15. • To produce an optimal 6 degree taper, each opposing axial wall should have an inclination of 3 degrees to the path of insertion
  16. 16.
  17. 17. a functional cusp bevel , in a plane parallel to the opposing cusp , gives adequate bulk to the crown without sacrificing the tooth structure
  18. 18. if functional cusp bevel is omitted , crown will be too thin in this stress bearing area
  19. 19.  if crown thickness is achieved by overtapering the axial wall , retention is compromised . • also health of the pulp may be jeopardised
  20. 20. in absence of functional cusp bevel , the lab (technician) may overbulk the crown . this may lead to occlusal
  21. 21. A. ---- adequate axial reduction B. ---- inadequate axial reduction results in crown with thin , weak walls C. ---- bulky crown results in promoting plaque accumulation , jeopardising the health of periodontium ( niether flat nor fat )
  22. 22. Thank you For more details please visit