Retainers in FPD

1. RETAINERS IN FPD
Dr Sunil Kumar Mishra
DEPARTMENT OF PROSTHODONTICS

2. What is a Retainer?
• It’s that component of an FPD which takes
support from the abutment tooth and provides
retention to the prosthesis.

3. CLASSIFICATIONS
1.EXTRACORONAL
A. Fullveneer Crown
a. Complete metal
b. Full ceramic
c. Metal ceramic
B. PARTIAL VENEER CROWN
a. Anterior 3/4 crown
b. Posterior 3/4 crown
c. Seven eight crown
C. RESIN BONDED RETAINERS
2.INTRACORONAL
a.inlyas
b.Onlyas
3.RADICULAR RETAINERS

4. REQUIREMENTS
1. Withstand masticatory forces
2. Restore anatomy of tooth
3. Pulp consideration
4. Esthetics
5. Hygienic

5. These retainers cover all the five surfaces of the abutment
tooth.
FULL COVERAGE RETAINER

6. FULL METAL CROWN RETAINER
All axial surfaces of tooth included
Advantages
1.Highly retentive
2.High resistance
3.Superior strength
Disadvantages
1.More extensive preparation
2.Not feasible for electric vitality test
3.Esthetic
.

7. INDICATIONS
• Extensive coronal destruction
• Short clinical crown
• Maximum retention and resistance needed
• Axial correction needed
• Endodontically treated tooth

8. CONTRAINDICATION
• If treatment objective can be met with more
conservative preparation
• High esthetic demand
• When less than maximum retention and
resistance needed

9. ALL CERAMIC CROWN RETAINER
• Most esthetic restoration
• No metal to block light transmission

10. 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 structure.
6.Incisal edge reasonably intact

11. 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 occlusal
8.Short clinical crown

12. ADVANTAGES
1.Improved esthetics
2.Good tissue response
3.Slightly more conservative than metal ceramic
restoration
DISADVANTAGES
1.Less strength of restorative material
2.More destructive preparation
3.Proper preparation is extremely critical
4.Restricted only for anterior

13. METAL CERAMIC CROWN RETAINER
Thin ceramic layer bonded to cast metal coping
Strength(metal) + esthetic (porcelain)

14. INDICATIONS
a.High esthetic demand
b.Act as retainer for FPD
CONTRAINDICATIONS
a.Active caries
b.Periodotally untreated teeth
c.Young patients
d.Where conservative treatment feasible

15. ADVANTAGES
A.Strenth +esthetics
B.Excellent retentive qualities
DISADVANTAGES
1. More tooth reduction
2.Perio consideration
3.Inferior esthetic-to all porcelain
4.Expensive
5.Subjectable to stress fracture

16. PARTIAL VENEER CROWN RETAINER
• Extra coronal restoration covers only part of
clinical crown
• More demanding preparation
• Difficult to match tooth for its texture,
appearence
• Gingival health

17. TYPES
1.Antetior three quarter crown
2.Posterior three quarter crown
3.Posterior 7/8 crown

18. INDICATIONS
• Intact or minimal restored teeth
• Intact buccal surface
• No conflict between axial relationship and
proposed path of withdrawal of FPD

19. CONTRAINDICATION
• Short clinical crown
• As retainer for long span FPD
• Anterior endodontic treated tooth
• Shape and alignment of teeth
• High caries index
• Thin teeth

20. Advantages
• Conservative tooth preparation
• Accessibility
• Less gingival involvement
• Good/complete seating of prosthesis
• Feasible to electric vitality test
Disadvantages
• Less retentive/resistant than full crown
• Limited path of withdrawal adjustment
• Cannot be used on nonvital tooth

21. 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

22. Advantages
• Less cost, little/less tooth preparation
• No need of anaesthesia
• Supragingival margins
• Rebonding possible
Disadvantages
• Irreversible
• Uncertain longetivity
• No space for correction
• No alignment correction
• Difficult temporization

23. Indications
• Caries free abutment
• Mandibular incisor replacement
• Maxillary incisor replacement
• Single posterior tooth replacement
Contraindication
• Extensive caries
• Deep vertical overbite
• Nickel sensitivity

24. Intra-coronal retainers can either be
I. Inlay
II. Onlay
INTRA-CORONAL RETAINER

25. RADICULAR RETAINERS
Consists of post/core that obtains its retention
and resistance to displacement from prepared
root portion of an endontically treated tooth

26. •These are used when path of insertion of the fixed
partial denture does not coincide with the long axis
of the abutment tooth.
• Indicated in tilted abutment.
TELESCOPIC RETAINER