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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