REGARDING RETAINERS IN FPD

1. RETAINERS IN FPD
DR YOGESH KUMAR M
II PG
Dept of Prosthodontics

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

5. 2.INTRACORONAL
 a.inlyas
 b.onlyas
3.RADICULAR
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

39. 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

40. Thank you