RETAINERS IN FPDppt
- 1. RETAINERS IN FPD DR GIRISH GALAGALIDR MDS Dept of Prosthodontics Navodaya Dental College
- 2. CONTENTS INTRODUCTION CLASSIFICATION OF RETAINERS REQUIREMENTS FULL VENEER CROWN 1.full metal 2.metal ceramic 3.full ceramic Indication /contraindication Advantages /Disadvantages PARTIAL VENEER CROWN RETAINERS; Types indication /contraindication advantages/disadvantages RESIN BONDED RETAINERS ;CLASSIFICATION Indication/contraindication/Advantages RADICULAR RETAINERS SUMMARY AND CONCLUSION
- 3. INTRODUCTION
- 4. CLASSIFICATIONS 1.EXTRACORONAL A.FULLVENEER CROWN a. Complete metal b.Full ceramic c.Metal ceramic B.PARTIAL VENEER CROWN a.ant.3/4 crown b.post.3/4 crown c.Seven eight crown C.RESIN BONDED RETAINERS
- 6. REQUIREMENTS 1. Withstand masticatory forces 2. Restore anatomy of tooth 3. Pulp consideration 4. Esthetics 5. Hygienic
- 7. FULLMETAL CROWN All axial surfaces of tooth included ADVANTAGES 1.Highly retentive 2.High resistance 3.Superior strength 4 Axial contour modification 5.Occlusal modification .
- 8. DISADVANTAGES 1.More extensive preparation 2.Not feasible for elec vitality test 3.Esthetic
- 9. INDICATIONS Extensive coronal destruction Short clinical crown Max retentive and resistance needed Axial correction needed Endodontically treated tooth
- 10. CONTRAINDICATION If treatment objective can be met with more conservative preparation High esthetic demand When less than max retentive and resistance needed
- 11. Salient feature of preparation
- 12. ALL CERAMIC CROWN RETAINER Most esthetic restoration No metal to block light transmission, brittle Not effective as retainer for FPD Requires connector of large dia, cross sectional dimension and its effect on periodontia
- 13. INDICATIONS 1.High esthetic demand 2.Teeth with proximal /facial caries 3.Sufficient coronal structure to support 4.Favourable Occlusal load distribution 5.Centric contact :on an area where porcelain is supported by tooth str. 6.Incisal edge reasonably intact
- 14. CONTRAINDICATION 1.High caries index 2.Conservative restoration can be used 3.Insufficient tooth structure to support 4.Thin teeth facio-lingually 5.Unfavourable occlusal load distribution 6.Bruxism 7.Edge edge occlusion 8.Short clinical crown 9.Opposing tooth occluding in cervical fifth of lingual surface
- 15. ADVANTAGES 1.Improved esthetics 2.Good tissue response 3.Slightly more conservative than metal ceramic restoration
- 16. DISADVANTAGES 1.Less strength of restorative material 2.More destructive preparation 3.Proper preparation is extremely critical 4.Restricted only for anteriors
- 17. Salient features of preparation
- 18. METAL CERAMIC CROWN RETAINER Thin ceramic layer bonded to cast metal coping Strength(metal) + esthetic(porcelein) Deep reduction IMP; 1,overconturing 2.shade/translucency
- 19. INDICATIONS a.High esthetic demand b.Act as retainer for FPD c.All other full metal crown retainer
- 20. CONTRA-INDICATIONS a.Active caries b.Periodotally untreated teeth c.Young patients d.Where conservative treatment feasible
- 21. ADVANTAGES A.Strenth +esthetics B.Excellent retentive qualities C.Axial form correction D.Occlusal correction
- 22. DIS-ADVANTAGES 1.High tooth reduction 2.Perio consideration 3.Inferior esthetic-to all porcelain 4.Expensive 5.Subjectable to stress fracture
- 23. Salient features of preparation
- 24. PARTIAL VENEER CROWN RETAINER Extra coronal restoration covers only part of clinical crown More demanding preparation ,not routinely used Based on premise;tooth structure should not be covered unless needed No technician can match tooth for its texture, appearence Gingival health
- 25. TYPES 1.Antetior three quarter crown 2.Posterior three quarter crown 3.Posterior 7/8 crown
- 26. INDICATIONS Sturdy clinical crown Intact buccal surface; no need of contour No conflict b/w axial relationship and proposed path of withdrawal of FPD
- 27. Contra-indication Short clinical crown As retainer for long span FPD Anterior endodontic tooth Shape and alignment of teeth High caries index Thin teeth
- 28. Advantages Conservative tooth preparation Accessibility Less gingival involvement Good/complete seating of prosthesis Feasible;elec vitality test
- 29. Dis-advantages Less retentive/resistant than full crown Limited path of withdrawal adjustment Requires dextrisity from operator Cannot be used on nonvital tooth
- 30. RESIN-BONDED RETAINERS To overcome the tooth reduction required for placement of retainer CLASSIFICATION 1.ROCHETTE BRIDGE 2.MARYLAND BRIDGE 3.CAST METAL FPD 4.VIRGENIA BRIDGE
- 31. Advantages Low cost, little/less tooth preparation No need:anaesthesia Supragingival margins Rebonding possible
- 32. Dis-advantages Irreversible Uncertain longetivity No space for correction No alignment correction Difficult temporization
- 33. Indications Caries free abutment Mandibular incisor replacement Maxillary incisor replacement Period-splint Single posterior tooth replacement
- 34. Contra-indication Extensive caries Deep vertical overbite Nickel sensitivity
- 35. Inlays/onlays Indication Contra indication Advantages Dis advantages Small caries lsion-in sound tooth Adequate dentinal support Low caries rate Retainer for single tooth replacement where expected masticatory load Isless High caries index Poor plaque control Small teeth Adolescents Poor dentinal support Longevity No discolouration Least complex preparation may display the metal Wedge retention
- 37. RADICULAR RETAINERS Consists of post/core that obtains its retention and resistance to displacement from prepared root portion of an endontically treated tooth Root preparation retain core while core establish resistance/retention for a complete veneer crown that restores pulpless tooth to normal form/function These can be custom made/prefabricated Dep:post length/shape/dia/surface confi
- 38. CRITERIA FOR SELECTION Alignment of abutment tooth &retention Appearance Condition of abutment tooth Cost Preservation of tooth structure
- 42. REFERENCES H.T.Shillingburg:fundamentals of fixed prosthodontics 3rd edn QB 2002 Annusavice :phillips science of dental materials 11th edition elselvier 2003 Rosenstiel:cotemporary fixed prosthodontics 3rd edn Mosby 2002 D C N A: ceramics oct 1977 21;4 M.A.Marzouk;Operative Dentistry .Modern theory and practice 1997 Shillingberg; fundamentals of tooth preparation for cast metal and porcelain restoration QB 1987
- 43. Thank you