dental composites

dental composites

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  By NimrahRazzaqueMemon DCP; BatchVSem.V;Dental Tech.
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  OBJECTIVE •Classification of composites •Propertiesof composites •Polymerization of composites •Application of composites •Advancement of composites •Indirect composites
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  CLASSIFICATION OF COMPOSITES •A/cTo Skinner •Bayne& Hayman Classification •A/cToViscosity •Phillips & Lutz Classification
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  A/c To Skinner •Traditionalor conventional ----- 8-12 micron •Small particle filled composite ----- 1-5 micron •Microfilled composite --------- 0.4-0.9 micron •Hybrid composite ----------- 0.6-1 micron Bayne & Hayman Classification •Megafill----------- 1-2mm •Macrofill-----------10-100 micron •Midifill--------------1-10 micron •Minifill--------------0.1-1 micron •Microfill-------------0.01-0.1 micron •Nanofill--------------0.005-0.01 micron
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  A/cToViscosity •Flowable Composites •Packable Composites Phillips& Lutz Classification •Macrofilled Composites-------- 5-12 micron •MicrofilledComposites--------- 0.04-0.1 micron Hybrid Composites--------------- 0.04 micron *Nanofills & Nanohybrid Composites *Microhybrid Composites
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  PROPERTIES OF COMPOSITES •Coefficientof thermal expansion – 3 times higher than normal tooth, micro fills show more . •Water absorption – high filler content lower is the water absorption. •Wear resistance – prone to wear, it is effected by size, shape & content of filler. •Surface texture – size & composition of filler determines smoothness. •Radiopacity – resins are translucent, fillers like barium, glass, strontium & zirconium makes it radiopaque. •Solubility - there is no significant solubility , 0.5-1.1 mg/cm3 water solubility •Polymerization shrinkage - shrinks while curing. •C-factor – it’s the ratio of bonded surface of restoration to unbonded surface, high value shows greater shrinkage. •Aesthetics – translucent, available in variety of shades.
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  POLYMERIZATION OF COMPOSITES It dependupon the following factors •Curing time – short exposure time cause accelerated ratio of curing which leads to substantial stress buildup •Shade of composite – dark shade require long curing time •Distance & Angle b/w light source & Resin – angle of source should be at 90 degree to resin, if angle diverges from 90 degree. •Temperature – composite curing would be less if they are taken but immediately from refrigerator. •ResinThickness – It should be ideally 0.5-0.1 mm for optimum polymerization of resin •Inhibition Of Air – O2 in air also effects the polymerization of resin. •Intensity Of Curing Light – for optimal results wavelength of light should range b/w 400-500 mm •Type Of Filler – micro fine composites are more difficult to cure than heavily loaded.
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  APPLICATION OF COMPOSITES TYPEOF RESTORATION RECOMMENDED RESIN COMPOSITE  CLASS I – CLASSV  CLASSVI  CERVICAL LESIONS &PEDIATRIC RESTORATIONS  3 UNIT BRIDGEOR CROWN  ALLOY SUBSTRUCTURE  CORE BUILD UP  TEMPORARY RESTORATION  HIGH CAVITY RESTORATION  MULTIPURPOSE, NANOCOMPOSITE, PACKABLE MICROFILLED, COMPOMERS.  PACKABLA NANOCOMPOSITES  FLOWABLE,COMPOMER  LABORATORY (FRC)  LABORATORY (BONDED)  CORE  PROVISIONAL  HYBRID COMPOSITE
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  ADVANCE COMPOSITES •COMPOMERS •OVMOCERS •ANTIBACTERIAL COMPOSITES •SMARTCOMPOSITES •LAB COMPOSITES •CORE- BUILD UP COMPOSITES •SILORANE COMPOSITES
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  INDIRECT COMPOSITES It includes: •FIBREREINFORCED COMPOSITES •CEROMERS
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  REFERENCES •Textbook of operativedentistry by nisha garg •Craig’s restorative dental materials
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  THANK YOU