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 www.indiandentalacademy.com ,or call
0091-9248678078

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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 www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. Fixed Partial Dentures www.indiandentalacademy.com
  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 www.indiandentalacademy.com
  4. 4. Inlay Crown vs www.indiandentalacademy.com
  5. 5. • An inlay depends on internal retention to hold it within the preparation www.indiandentalacademy.com
  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 www.indiandentalacademy.com
  7. 7. www.indiandentalacademy.com
  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 www.indiandentalacademy.com
  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 www.indiandentalacademy.com
  10. 10. Two plane reduction for central incisors www.indiandentalacademy.com
  11. 11. Two plane reduction on buccal aspect of mandibula r molar www.indiandentalacademy.com
  12. 12. www.indiandentalacademy.com
  13. 13. • www.indiandentalacademy.com
  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 www.indiandentalacademy.com
  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 www.indiandentalacademy.com
  16. 16. www.indiandentalacademy.com
  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 www.indiandentalacademy.com
  18. 18. if functional cusp bevel is omitted , crown will be too thin in this stress bearing area www.indiandentalacademy.com
  19. 19.  if crown thickness is achieved by overtapering the axial wall , retention is compromised . • also health of the pulp may be jeopardised www.indiandentalacademy.com
  20. 20. in absence of functional cusp bevel , the lab (technician) may overbulk the crown . this may lead to www.indiandentalacademy.com 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 ) www.indiandentalacademy.com
  22. 22. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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