Resin bonded fixed partial denture
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Transcript of Resin bonded fixed partial denture
Resin Bonded Fixed Partial Denture
Prepared by azheen mohamad
References contemporary-fixed- prosthodonics 4th edition ,chapter 26 ,pp805
www.slideshare.comhttps://everythingdentistry.wordpre
ss.com/tag/lost-salt-technique/
http://www.slideserve.com/jana/resin-bonded-fixed-partial-dentures-rbfpd
Introduction
A prosthesis that requires minimal removal of tooth structure , particularly for abutment teeth that are intact and caries free.
The primary goal of the resin bondedFPD is the replacement of missingteeth and maximum conservation of tooth structure.
DefinitionResin bonded prosthesis A prosthesis that is luted to tooth structure , primarily enamel , which has been etched to provide mechanical retention for the composite resin.
Types of FPD:-CantileverFixed-fixedFixed-movableHybrid
Cantilever bridgeInvolves the use of single retainer
Abutment tooth maybe either mesial or distal .
Less expensive, but limited to replacing one missing
tooth.
Fixed-fixed bridge
One or more retainers are placed on either
side of the pontic.Differential movement of abutments
canresult in bond failure.This design of bridge is indicated
whereexcursive movements on pontics cannot be avoided.
Fixed-movable bridgeDesign is in two parts, keyed together by anon-rigid attachment .Connector which may be either ready or
laboratory-made, permits movement of the two parts relative to each other in vertical direction mainly.
Provides stress breaking action.Should be used in short spans and where
opposing proximal walls of abutment cant be prepared parallel.
Hybrid bridge A combination of a conventional Retainer at one end and a resin-bonded retainer at the other end of the pontic.Indicated where one of the
abutments is minimally restored,and a resin-bonded retainer is used at this site to conserve tooth tissue.
The male part of the joint is often attached to the resin-bonded retainer to simplify maintenance when de-bond occurs.
Advantages of Resin bonded bridges.1) Reduced cost .2) No anesthetic needed.3) Supragingival margins.4) Minimal tooth preparation.5) Rebonding possible.
DisadvantagesIrreversible.Uncertain longevity.No space correction.No alignment correction.Difficult temporization.
Indications.1) Adolescents with single missing
teeth (traumatic or congenital). 2) Caries- free abutment teeth and
good oral hygiene.3) Maxillary incisor replacements
(most favorable prognosis) and Mandibular incisor replacements.
4) Periodontal splints.5) Single posterior tooth
replacements.
ContraindicationsExtensive caries.Nickel sensitivity.Deep vertical overbite.Extensive restoration on abutment teeth.
Parafuncitonal habits
Developed in 1973.It was a complete innovation.Use of ring like retainers , with funnel shaped
perforations through them to enhance resin retention.
Direct Bridge:-Indirect bridge:-Rochette bridge(Macro Mechanical Retention )
The Perforation Technique Presents The Following Limitations:1. Weakening of the metal retainer by the perforations.2. Exposure to wear of the resin at the perforations.3. Limited adhesion of the metal provided by the perforations.
Maryland ridge(Micro Mechanical retention)An electrolytic etching procedure for non-precious ceramic bonding alloys to provide a microporous surface that allows micromechanical interlock with the cement Thinner wings and no perforations
Virginia bridge.(Lost Salt Technique)(Medium Mechanical Retention) Roughned surface of the retainer itself provides for
retention
Achieved by lost salt technique.
Air abrasion with aluminium oxide.
This was a time saving method and more retention is achieved compared to the technique of etching.
Cast Mesh Fixed BridgeA net like nylon mesh is placed over
lingual surface of abutment teeth on the cast
It is then covered by wax, with the undersurface of the retainer becoming mesh like when retainer is cast.
Principle of abutment preparation:-1-distinct path of insertion2-proximal undercuts removed.3-occlusal or cingulum rest.4-proximal groove or slots to increase resistance.5-definitive supra gingival margin established.
Tooth preparation The strength of bonding to
prepared and etched enamel is greater than that to etched but unprepared enamel.
Preparation should cover as large as area as esthetically possible
Idealy single missing tooth,single mesial or distal abutment is sufficient.
Cantilever design proved successful.
Supragingival chamfer finishing line is perfered.
Light chamfer line is 0.1 supragingivaly.
Bonding steps.Sand blasting of metal framework.
Acid etchingRinsing and drying.
Contamination to be avoided at all cost.
Case
MissingmandibularRight central incisor
Bone loss and gingival recession in abutment teeth.
Grade 1 mobility.
Treatment plan.Resin bonded fixed partial denture was the treatment of choice.As patient wanted a fixed replacement of the missing teeth.
Need for splinting the lower anteriors.
Treatment plan.Resin bonded fixed partial denture was the treatment of choice.As patient wanted a fixed replacement of the missing teeth.
Need for splinting the lower anteriors.
Tooth preparation
Conventional Maryland bridge fabricated with porcelain fused to metal pontic.
Bonded with composite resin