Tooth Coloured Restorative Materials 112o2n

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GLASS IONOMER CEMENTS & COMPOSITES By Afeefa c Roll no;2

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| " # It was developed byWILSON and KENT in the early 1970s # The design of earliest glass ionomer cement was hybrid formulation of silicate and poly carboxylate cement # Earliest commercial product-Acronym for hybrid formulation ² Alumino silicate poly acrylic acid(ASPA) # The original poly acrylic acid in the liquid component was modified by copolymerisation with Itaconic acid,maliec acid &tartaric acid # Ag-Sn particle is ixed to produce amalgam substitutes combination -MIRACLE MIXTURE

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Composition Powder fluoro alumino silicate glass silica-increase translucency alumina-Skeletal structure & increase opacity calcium fluoride-increase opacity &act as flux Aluminium fluoride Sodium flouride Aluminium phosphate



Liquid 40-55% soln of poly acrylic or itaconic acid copolymer in water or Copolymer of maleic acid & poly acrylic acid-improve storage Tartaric acid-maintain working time

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gently spread liquid drop over the glass slab roll first half of the powder in to liquid incorporate two together rapidly , this is completed in 10 sec rest of powder is brought in to mix Mixing time 25-30 sec setting time type 1 4 to5 type2 7sec

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Glass Ionomer show high degree of biocompatibility with living tissues Poly acrylic acid are mild acids with high molecular wt and long complex chain formation .this make difficult for acid to penetrate through dentinal tubules even it does not produce vigorous action Due to presence of Free fluoride !



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An organic resin component that forms the matrix Eg ; Bis GMA Inorganic filler these may be A)macro filler with particle size of about 5-10 mm eg; glass ,quartz ,ceramic etc B)Micro filler with particle size of 0.04mm eg;amorphous silica Coupling agent applied to filler to the resin silane -titanate or zirconate Initiator system to activate setting mechanism-light or chemical activation Inhibitors-BHT OPTICAL MODIFIERS-aluminium oxide

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MEASURE OF PERCENTAGE OF CARBON CARBON DOUBLE BOND THAT HAVE BEEN CONVERTED TO SINGLE BOND TO FORM POLYMERIC RESIN ! | |)

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