C&B Dental Composite

7/27/2019 C&B Dental Composite

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Dental Composite


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Dental CompositeTOPICS

History

Ideal Properties Of Composite Composite Structure

Curing Of Composite

Application Of Composite


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Dental CompositeAcrylic resins were introduced todentistry in the 1940s to constructdenture bases

It is this same acrylic resin that wasfirst used for indirect/direct filling of

individual teeth


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Dental CompositeThese were supplied as a powder-liquid system


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Dental Composite In the 1950s self curing unfilledacrylic resins (denture base acrylic)was used moderately for the filling ofindividual teeth

They were easy to use, polish, and

had good initial aesthetics


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Dental CompositeThe main problems encountered werehigh shrinkage upon polymerization,large thermal dimensional change,eventual discolouration and a highwear rate


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Dental CompositeDuring the 1960s fillers were addedto the acrylic resins to form what arenow known as Resin Composite, DentalComposite or Composite


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IDEALPROPERTIES OFCOMPOSITE


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Ideal PropertiesImportant properties of compositesinclude; Low polymerization shrinkage

Low water sorption Coefficient of thermal expansionsimilar to tooth structure

High fracture resistance

High wear resistance


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Ideal PropertiesHigh radiopacity

High bond strength to enamel anddentin

Good colour match to tooth structure

Ease of manipulation

Ease of finishing and polishing


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COMPOSITESTRUCTURE


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Composite StructureThere are three structural componentsin dental resin- based composites:1 ) Matrix- A plastic resin material that

forms a continuous phase and bindsthe filler particles


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Composite Structure2) Filler- Reinforcing particles and/or

fibres that are dispersed in thematrix

3) Coupling Agent- Bonding agent thatpromotes adhesion between filler and

the resin matrix


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Composite Structure Composite restorative materialscontain a number of components inaddition to the resin matrix, filler

particles and a coupling agentAn activator- initiator system isrequired to convert the resin

paste from a soft, mouldablefilling material to a hard,durable restoration


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Composite StructureOther components are included toenhance the performance, appearanceand durability of the material

Pigments help to match the colour ofthe tooth structure


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Composite StructureUltraviolet (UV) absorbers and otheradditives improve colour stability, andpolymerization inhibitors extend

storage life and provide increasedworking time for chemically activeresins


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CURING OFCOMPOSITE


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Curing Of CompositeThe activator- initiator systems usedallow for; Self- curing Light- curing Dual- curing


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Curing Of CompositeSELF- CURING Chemically activated polymerization isinitiated by mixing two pastes justbefore use


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Curing Of CompositeSELF- CURINGDuring mixing it is almost impossibleto avoid incorporating air into themix, thereby forming pores thatweaken the structure and trapoxygen, which inhibits polymerization

during curing


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Curing Of CompositeSELF- CURINGWorking time is also limited and outof the control of the operator socontouring must be completed quickly


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Curing Of CompositeLIGHT- CURING Light- curable dental composites aresupplied as single paste contained in alight proof syringe.


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Curing Of CompositeLIGHT- CURING These materials allow the operator to

complete insertion and contouringbefore curing is initiated

Click below to show video


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Curing Of CompositeLIGHT- CURINGThe advantage of using a paste andlight curing system is that smallamounts of material can be added(layered) and cured


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Curing Of CompositeLIGHT- CURINGThe disadvantage of compositematerial is that when laid in largeamounts the light may not penetrateand activate the curing process at thedeeper levels


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Curing Of CompositeDUAL- CURING Dual- curing dental composites consistof two light curable pastes thatcontain chemical accelerators andlight activators so that polymerizationcan be initiated by light and then

continued by the self- cure mechanism


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Curing Of CompositeDUAL- CURING


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Curing Of CompositeCOMPOSITE INITIATING &PROCESSING SYSTEMS Composite restorations produced in

the laboratory may be processed usingvarious combinations of light, heat,pressure and vacuum this increasesthe degree of polymerization, density,mechanical properties and wearresistance


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Curing Of CompositeCOMPOSITE INITIATING & PROCESSING SYSTEMS


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APPLICATION OFCOMPOSITE


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Application OfCompositeAs a modern dental technician you maybe required to fabricate indirectcomposite restorations such as; Veneers

Inlays

Onlays


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Application OfCompositeTemporary/Permanent Crowns

Temporary/Permanent Bridges


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Application OfCompositeOne of the main advantages ofindirect composite restorations is thatthe dental technician has better

access to the margins and theinterproximal space as we have theadvantage of working on a die or a

model


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Summary

History

Ideal Properties Of Composite

Composite Structure Curing Of Composite

Application Of Composite

Documents

C&B Dental Composite