Glass ionomer cement
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Transcript of Glass ionomer cement
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GLASS IONOMER CEMENT
BY: NIKHILA N KASHYAP
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CONTENTS Introduction History Composition Classification Dispensing Manipulation Setting reaction Properties Indications and contraindications Advantages and disadvantages
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INTRODUCTION What is a cement? A cement is a substance that hardens
to act as a base ,liner ,filling material ,or adhesives to bind devices or prosthesis to the tooth structure or to each other.
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GLASS IONOMER CEMENT It is a tooth colored materialBased on reaction between silicate glass powder and polyacrylic acid Chemically bind to tooth structure ADA specification number 96
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HISTORY Invented in 1969 Reported by wilson and kent in 1972 The term was coined by B.E KENT Other names: Ionomer poly-carboxylate acid ISO terminology Poly-alkenoate cement Since its extensive usage to replace the
dentin-dentin substitute , man-made dentin, artificial dentin
ASPA- alumino silicate poly-acrylate.
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COMPOSITION
Species Composition(%)
Silica (SiO2) 30.1Alumina (Al2O3) 19.9Aluminium fluoride (AlF3)
2.6
Calcium fluoride (CaF2)
34.5
Sodium fluoride (NaF) 3.7Aluminium phosphate (AlPO4)
10.0
Powder: It is an acid soluble calcium fluoro aluminosilicate glass
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LIQUID Species
composition(%)Polyacrylic acid 40-50%
water 50%
Itaconic acid , maleic acid , tri carboxylic acid
0.5%
Tartaric acid 5-15%
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CLASSIFICATION
According to A.D WilsonI. Type 1: Luting agentsII. Type 2: Restorative cements a)aesthetic filling material b)bis-reinforced filling
materialIII Type 3: Lining, base and fissure
sealing materials
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According to application Type 1) luting Type 2) restoration Type 3) liners and base Type 4) pit and fissures sealants Type 5) luting for orthodontic purpose Type 6) core build up material Type 7) fluoride releasing GIC Type 8) for ART Type 9) for pediatric purpose
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DISPENSING
Commercially available in 2 forms 1. Encapsulated2. Powder and
liquid
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MANIPULATION
1) Tooth preparation: Pumice slurry is used to remove the
smear layer. Etched with phosphoric acid and rinse tooth surface should be cleaned and
dried for sustained adhesion .
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2) MATERIAL PREPARATION P/L ratio – 3:1 by weightpaper pad or dry glass slab is usedWHY?Powder and liquid is dispensed just before mixing
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Powder is incorporated rapidly into the liquid
Half of the powder is mixed into liquid for 5-15 seconds , rest is then quickly added and mixed to get a uniform glossy appearance .
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CLINICAL STEPS
In cervical abrasion cases
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Pumice prophylaxis
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Dentin conditioning
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APPLICATION OF GIC
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FINISHINGExcess material must be trimmed from marginsHand instruments preferred to rotary instruments to avoid ditchingFurther finishing is done after 24 hours
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SETTING TIME
TYPE 1 4-5 Minutes
TYPE 2
7 Minutes
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SETTING REACTION Stage 1) Dissolution Stage 2)precipitation of salts, gelation
and hardening. Stage 3) hydration of salts
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STAGE 1) DISSOLUTION Surface layers of glass particles are attacked by poly acids and ions are released
Produce diffusion based adhesion between glass particles and matrix
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STAGE 2) PRECIPITATION, GELATION AND HARDENINGCalcium and aluminium ions bind to poly ionsInitial clinical set-Cross linking of ca ions -4-10 minutes from setting Next 24 hours –less mobile aluminium ions bound within the cement matrix – more rigid cross linking Fluoride and phosphate ions forms insoluble salts and complexesSodium ions – binds the powder to matrix
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STAGE 3) HYDRATION OF SALTS progressive hydration of matrix salts Sharp improvement in physical
properties
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SETTING RATE Manufacturer controlled glass composition
glass fusion temperature, powder particle size,
tartaric acid concentration Operator controlled Mixing temperature-storage of slab and
powder in a refrigerator increases the working time up to 25%
Powder: liquid ratio-inadequate liquid results in a decline in translucency and physical properties
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PROPERTIES Adhesion: chemically binds to tooth
structure Bio compatibility: resistance to plaque ,
plaque fails to thrive on the surface of GIC
Pulpal response to GIC: formation of dentin bridge occur when used to protect a mechanical or traumatic exposure of pulp
Remineralising effect
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Solubility : initial solubility is high due to leaching of intermediate products
is low when compared to zinc phosphate and zinc polycarboxylate
Dimensional change : volumetric setting contraction of approximately 3%
Strength : susceptibility to brittle fracture . Weak and lack rigidity when compared to composites and amalgams
Abrasion resistance : immediately after placement-less resistance to abrasion , as they mature their resistance improves
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Thermal diffusivity Color and translucency: type II a) restorative esthetic material provide adequate color
matching and translucency Radiopacity:more radiopaque than dentin and
several exceed that of enamel Anticariogenic property: fluoride is released at
the time of mixing and lies within the matrix - flouride reserviour
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MODIFICATIONF OF GIC1) Water settable GICLiquid used is clean waterLiquid is delivered in a freeze dried form ,which is
incorporated into the powder2) Resin modified GICPowder component consist of ion leachable
fluroalumino silicate glass particles and initiator for light curing
Liquid component consist of water and poly acrylic acid with methacrylate and hydroxyl ethyl methacrylate monomer
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3) Metal modified GICGIC have been modified by addition of filler particles,
to improve strength fracture toughness and resistance to wear
Silver alloy admix / miracle mixThis is made by mixing of spherical silver amalgam
alloy powder with glass ionomer powderCermentBonding of silver particles to glass ionomer particles
by fusion through high temperature sintering
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3) Compomer It is a composite resin that uses and ionomer
glass which is the major component of glass ionomer as the filler
Small quantity of dehydrated poly alkenoic acid incorporated with filler particles
Setting reaction is light activatedAdhesive system used with compomer is based
on acid etch found with all composite resin
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ATRAUMATIC RESTORATIVE TREATMENTPRINCIPLES1.Removing carious tooth tissue using hand
instruments only2.Restoring the cavity with adhesive
material(glass ionomer)Why GIC?Chemically binds to enamel and dentinFlouride release to prevent and arrest cariesBiocompatible – no irritation to pulp and gingiva
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INDICATIONS Type I) useful in patients with high caries index Type II) restoring of erosion / abrasion lesions without
cavity preparation sealing and filling occlusal pits and fissures restorations of class III lesions repair of defective margin in restoration core build up intermediate restoration Type III) lining of all types of cavities where a biological
seal and cariostatic action are required sealing and filling of occlusal fissures showing
early signs of caries
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CONTRAINDICATIONS Class IV carious lesions or fractured
incisors Class II carious lesions where
conventional cavities are prepared Replacement of existing amalgam
restoration Lost cusp areas
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ADVANTAGES Inherent adhesion to tooth structure Good marginal seal Anticariogenic property Biocompatibility Minimal cavity preparation required Restoration in primary dentition
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DISADANTAGES Low fracture resistance Low wear resistance Water sensitive during setting phase Less esthetics compared to composites
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Thank you