This document discusses resin bonded fixed dental prostheses (FPDs). It begins by defining resin bonded FPDs as bridges that are bonded to etched enamel using resin cement, providing mechanical retention without preparation of dentin or pulp. It then covers the indications and contraindications, advantages and disadvantages, classifications including mechanical, micromechanical, macromechanical and chemical types, fabrication process including tooth preparation and bonding, and concludes that resin bonded FPDs can be viable options when carefully indicated and fabricated, requiring the same attention to detail as conventional FPDs.

1. RESIN BONDED
FPD
Dr Ratheesh
Senior lecturer
Department of Prosthodontics

2. contents
 Introduction
 Indications and contraindications
 Advantages and disadvantages
 Classification
 Fabrication
 Conclusion

3. DEFINITION
A Fixed dental prosthesis that is luted to the tooth structures,
primarily enamel, which has been etched to provide
mechanical retention for the resin cement

4. It is also termed as adhesive bridge
First described by Rochette in 1973
Buonocores acid etch technique and Bowne’s resin assisted the
development of this concept

5. INDICATIONS
1. Replacement of missing
anteriors
2. Abutment with sufficient
enamel to etch for retention
3. Splinting periodontally weak
teeth

6. 4.Short span bridges
5. Medically compromised
patients
6. As a temporary restoration
7. Postorthodontic retention

7. CONTRAINDICATIONS
1. Insufficient occlusal
clearence
2.Thin anterior teeth
faciolingully
3. Short clinical crown
4. When facial esthetics
needs a change

8. 5. Deep vertical overlap
6. Sensitivity to base metal
alloys
7. Long span bridges
8. Para functional habits

9. 9. Insufficient enamel available for
bonding

10. INDICATIONS CONTRAINDICATIONS
1. Replacement of missing
anteriors
2. Abutment with sufficient
enamel to etch for
retention
3. Short span bridges
4. Splinting periodontally
weak teeth
1. Insufficient occlusal
clearance
2. Thin anterior teeth
faciolingually
3. Short clinical crowns
4. When facial esthetic of
teeth require a change

11. INDICATIONS CONTRAINDICATIONS
5. Medically compromised
patients
6. As long term temporary
restoration in patients with
craniofacial anomalies
7. Post orthodontic retention
5. Insufficient enamel
available for bonding-
caries, restoration,
hypoplasia
6. Deep vertical overlap
7. Parafunctional habits
8. Long span bridges
9. Sensitivity to base metal
alloys

12. ADVANTAGES DISADVANTAGES
1. Conservation of tooth
structure, preparation is
confined to enamel
2. Tolerant to tissue with no
pulpal trauma and
supragingival margin
3. Anesthesia not required
4. Impression making is easy
1. Longevity is in question
2. Technique sensitive
3. Space, contour and
alignment correction of
abutment is not possible
4. Possibility of
overcountouring is high
which can lead to increased
plaque accumulation

13. ADVANTAGES DISADVANTAGES
5. Provisional restoration are not
required
6. Less chair side time
7. Does not require cast
alteration or removable dies
8. Reduced cost
9. Rebonding possible
5. Can be used to restore only
one tooth
6. Can cause greying in thin
tooth
7. Aesthetic is moderate

14. Classification
 Mechanical
 Micromechanical
 Macromechanical
 Chemical

15. Mechanical(Rochette bridge)
 Developed in 1973
 First resin bonded prosthesis
 Rochette utilized a wing like retainer with multiple flared perforation
to provide mechanical retention for resin cement

16.  This was used at that time for both anterior and posterior FPD

17. Limitation
 Perforation weakened the metal retainers
 The resin in the perforations was exposed to oral fluids,
which caused wear and microleakage
 Retention provided by perforation are limited

18. Micromechanical (Maryland bridge)
 Developed by Livaditis and Thompson at the University of
Maryland in 1981
 Electrolytic etching was used to provide micromechanical
retention to non perforated base metal retainer, bonded by resin
cement

19.  For etching they used 3.5% solution of nitric acid with a current
of 250mA/cm2 for 5min followed by immersion in 18% HCL
solution in an ultrasonic cleaner for 10min
 10% sulphuric aid in 300mA/cm2 current has been used for
etching beryllium containing alloys and a one step technique
using sulphuric acid and hydrochloric acid placed in an
ultrasonic cleaner for 99sec while current is passed

20. ADVANTAGES
 Better retention than perforated retainers
 Highly polished retainers prevented plaque accumulation

21. LIMITATIONS
 Highly technique sensitive
 Variable results were reported for etching the same alloy
 Retention decreased with time

22. Macromechanical
VIRGINIA BRIDGE
 Developed by Moon and Hudgins at university of Virginia in
1983
 Utilized macroscopic mechanical retention using lost salt
crystal technique

23. PROCEDURE
 The die is lubricated and sieved cubic salt 150-250 cm3 is
sprinkled on the surface leaving out the margins
 A resin pattern is now constructed over the salt allowing it to
get incorporated in the resin
 The sat is then dissolved by placing the set pattern in an
ultrasonic cleaner. This leaves behind voids in the pattern,
which is reproduced in the casting. This provides retention

24. ADVANTAGES
 Procedure can be used with any metal
 Bonding to metal superior to electrolytic method

25. DISADVANTAGES
 Thickness of the retainer is increased to allow retentive layer

26. CAST MESH FPD
 A nylon mesh is placed on the palatal/lingual surface of the
abutment dye and the pattern is fabricated over this mesh
 The mesh gets incorporated and following casting provides
retention for resin to metal

27.  DISADVANTAGE
 Adaptation of nylon mesh to cast is not good
 The wax may flow in between the mesh locking all undercuts

28. Chemical (adhesive bridge)
 Most commonly used
 High bond strength
 Fracture toughness
 Long term clinical success

29. Modified Bis GMA cement
 A metal primer is used to bond the resin cement to metal
alloys
 Effective for both noble and base metal alloy

30. Super bond
 powder - polymer of methyl methacrylate and liquid - methyl
methacrylate modified with adhesive 4-META
 catalyst -tri-n-butylborate

31. Rocatec system
 Laboratory method of bonding tooth to both noble and base
metal alloy
 Fitting surface is sandblasted with 120mcm alumina
 Followed by abrasion with a special silicate particle containing
alumina which deposits a coating of silica and alumina on alloy
suface

32.  A saline coupling agent is applied to bond the metal to resin
cement
 There is a risk of contamination of silica treated surface before
or during clinical procedure

33. fabrication
TOOTH PREPARATION
Principles
 Lingual axial reduction following the anatomic planes
 Proximal preparation must extend labially just beyond contact
dictated by esthetics
 Should encompass at least 180 degree of tooth

34.  Supra-gingival chamfer finish line
 Occlusal clearance of 0.5 mm where required
 Resistance can be enhanced by proximal groove boxes
 Vertical stops or support can be provided by countersink or
cigulum rest in anterior abutments and occlusal rest in
posteriors

37. Anterior preparation design and
sequence

45. Posterior prepration design and
sequence

48. Impression and provisionals
 Similar to any other FPD
 Elastomeric impression material

49. Bonding
 Prepared tooth surface is cleaned using pumice and water
 37% phosphoric acid is used to etch the prepared enamel for 15sec.
It is then rinsed and dried
 Specially formulated composite resin cements are available for
bonding resin bonded FPD
 A metal primer or silane is applied on the fitting surface of the casting

50.  A bonding agent or primer is also applied on the prepared
enamel surface
 Resin cement is mixed and placed on the internal surface of
retainer
 The prosthesis is inserted and finger pressure is maintained
for 60sec till the initial set excess cement is removed and
material is allowed to completely set
 The occlusion is adjusted and margins are finished and
polished

51. Conclusion
 Resin bonded prosthesis are viable prosthesis n selected
situations. They should receive the same attention to detail
as conventional FPD for long term success. Patient selection
is vitally important and tooth preparation or enamel activation
is mandatory.