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