COMPOSITECOMPOSITION● Resin ー chemical name = methyl acrylate* (Denture base resin → PMMA)● Filler ー glass fillers*● Coupling agent ー silane / organosilane*● Packable and flowable composite difference○ Viscosityーresistance to flow● TEGMA is added to increase flow, ie becomes flowable composite○ Eg: pit and fissure sealants.FEATURES● Micromechanical bonding● Resin tags - penetrate into tooth structure -7 to 25 mm (tag length)● Ratio of bonded : unbonded Molecules /components→ C factor● Class I,II,III,IV → hybrid composite● Class V ー microfilled composite¤ High polishability¤ ∴ maximum cleaning efficiency¤ Or else rough surface → stains, calculus, perio problems etc.TYPES OF COMPOSITES MACROFILLED COMPOSITEa. Average particle size ー 10 μmb. 1st generation restoration composites.c. Paste - paste , chemical cured. Limited shade matching capabilitiese. Poor physical and mechanical propertiesf. Poor esthetics.MICROFILLED COMPOSITEg. Average particle size ー 0.04μmh. Light curedi. Suboptimal #toughness ー not strong for occlusal bearing areaj. Excellent esthetics and polishabilityk. Lower elastic modulus ー better in class Vl. Use primarily in anterior restoration.HYBRID (MINIFILL) COMPOSITEm. Average particle size ー 1 μmn. Light-curedo. Good properties.p. Good esthetics but not as polishable as microfilled.q. Universal use ー anterior and posterior restoration.MICROHYBRID COMPOSITESr. Average particle size ー 0.4 to 0.8 μms. Light curedt. Retain good properties of hybrid (strength) with improved handling.u. Polishability almost equal to microfillsv. Universal use ー anterior and posterior.NANOFILLED / NANOHYBRID COMPOSITESw. Filler - 20 nm nanomers 0.6 to 1.5 μm nanoclustersx. Light curedy. Excellent handlingz. High polishabilityaa. Low shrinkagebb. Universal use ー anterior and posterior.FLOWABLE COMPOSITEScc. High matrix/filler ratio contentdd. Higher polymerization shrinkagePACKABLE COMPOSITESee. Increased viscosityff. No documented benefits

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