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Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
Principles of tooth preparation /certified fixed orthodontic courses by Indian dental academy
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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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  • 1. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  • 2. Fixed Partial Dentures www.indiandentalacademy.com
  • 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. Inlay Crown vs www.indiandentalacademy.com
  • 5. • An inlay depends on internal retention to hold it within the preparation www.indiandentalacademy.com
  • 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. www.indiandentalacademy.com
  • 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. 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. Two plane reduction for central incisors www.indiandentalacademy.com
  • 11. Two plane reduction on buccal aspect of mandibula r molar www.indiandentalacademy.com
  • 12. www.indiandentalacademy.com
  • 13. • www.indiandentalacademy.com
  • 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. • 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. www.indiandentalacademy.com
  • 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. if functional cusp bevel is omitted , crown will be too thin in this stress bearing area www.indiandentalacademy.com
  • 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. in absence of functional cusp bevel , the lab (technician) may overbulk the crown . this may lead to www.indiandentalacademy.com occlusal
  • 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. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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