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GLASS IONOMER CEMENT
BY: NIKHILA N KASHYAP
CONTENTS
 Introduction
 History
 Composition
 Classification
 Dispensing
 Manipulation
 Setting reaction
 Properti...
INTRODUCTION
 What is a cement?
 A cement is a substance that hardens to act
as a base ,liner ,filling material ,or adhe...
GLASS IONOMER CEMENT
It is a tooth colored
material
Based on reaction
between silicate glass
powder and polyacrylic
acid...
HISTORY
 Invented in 1969
 Reported by wilson and kent in 1972
 The term was coined by B.E KENT
 Other names:
Ionomer ...
COMPOSITION
Species Composition(%)
Silica (SiO2) 30.1
Alumina (Al2O3) 19.9
Aluminium fluoride
(AlF3)
2.6
Calcium fluoride ...
LIQUID
Species composition(%)
Polyacrylic acid 40-50%
water 50%
Itaconic acid , maleic
acid , tri carboxylic acid
0.5%
Tar...
CLASSIFICATION
According to A.D Wilson
I. Type 1: Luting agents
II. Type 2: Restorative cements
a)aesthetic filling materi...
According to application
 Type 1) luting
 Type 2) restoration
 Type 3) liners and base
 Type 4) pit and fissures seala...
DISPENSING
Commercially
available in 2 forms
1. Encapsulated
2. Powder and
liquid
MANIPULATION
1) Tooth preparation:
 Pumice slurry is used to remove the smear
layer.
 Etched with phosphoric acid and ri...
2) MATERIAL PREPARATION
 P/L ratio – 3:1
by weight
paper pad or
dry glass slab is
used
WHY?
Powder and
liquid is
dispe...
 Powder is
incorporated rapidly
into the liquid
 Half of the powder is
mixed into liquid for
5-15 seconds , rest
is then...
CLINICALSTEPS
In cervical abrasion cases
Pumice prophylaxis
Dentin conditioning
APPLICATION OF GIC
FINISHING
Excess material
must be trimmed
from margins
Hand
instruments
preferred to
rotary
instruments to
avoid ditchin...
SETTING TIME
TYPE 1 4-5 Minutes
TYPE 2 7 Minutes
SETTING REACTION
 Stage 1) Dissolution
 Stage 2)precipitation of salts, gelation and
hardening.
 Stage 3) hydration of ...
STAGE 1)
DISSOLUTION
Surface layers of
glass particles are
attacked by poly
acids and ions are
released
Produce diffusion
...
STAGE 2) PRECIPITATION, GELATION AND
HARDENING
Calcium and aluminium ions bind to poly
ions
Initial clinical set-Cross l...
STAGE 3) HYDRATION OF SALTS
 progressive hydration of matrix salts
 Sharp improvement in physical properties
SETTING RATE
 Manufacturer controlled
glass composition
glass fusion temperature,
powder particle size,
tartaric acid con...
PROPERTIES
 Adhesion: chemically binds to tooth structure
 Bio compatibility: resistance to plaque ,
plaque fails to thr...
 Solubility : initial solubility is high due to
leaching of intermediate products
is low when compared to zinc
phosphate ...
 Thermal diffusivity
 Color and translucency: type II a) restorative
esthetic material provide adequate color
matching a...
MODIFICATIONF OF GIC
1) Water settable GIC
Liquid used is clean water
Liquid is delivered in a freeze dried form ,which is...
3) Metal modified GIC
GIC have been modified by addition of filler
particles, to improve strength fracture toughness
and r...
3) Compomer
It is a composite resin that uses and ionomer
glass which is the major component of glass
ionomer as the fille...
ATRAUMATIC RESTORATIVE TREATMENT
PRINCIPLES
1.Removing carious tooth tissue using hand
instruments only
2.Restoring the ca...
INDICATIONS
 Type I) useful in patients with high caries index
 Type II) restoring of erosion / abrasion lesions without...
CONTRAINDICATIONS
 Class IV carious lesions or fractured incisors
 Class II carious lesions where conventional
cavities ...
ADVANTAGES
 Inherent adhesion to tooth structure
 Good marginal seal
 Anticariogenic property
 Biocompatibility
 Mini...
DISADANTAGES
 Low fracture resistance
 Low wear resistance
 Water sensitive during setting phase
 Less esthetics compa...
Glass ionomer cement
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Glass ionomer cement

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Glass ionomer cement

  1. 1. GLASS IONOMER CEMENT BY: NIKHILA N KASHYAP
  2. 2. CONTENTS  Introduction  History  Composition  Classification  Dispensing  Manipulation  Setting reaction  Properties  Indications and contraindications  Advantages and disadvantages
  3. 3. 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.
  4. 4. GLASS IONOMER CEMENT It is a tooth colored material Based on reaction between silicate glass powder and polyacrylic acid Chemically bind to tooth structure ADA specification number 96
  5. 5. 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.
  6. 6. COMPOSITION Species Composition(%) Silica (SiO2) 30.1 Alumina (Al2O3) 19.9 Aluminium fluoride (AlF3) 2.6 Calcium fluoride (CaF2) 34.5 Sodium fluoride (NaF) 3.7 Aluminium phosphate (AlPO4) 10.0 Powder: It is an acid soluble calcium fluoro aluminosilicate glass
  7. 7. LIQUID Species composition(%) Polyacrylic acid 40-50% water 50% Itaconic acid , maleic acid , tri carboxylic acid 0.5% Tartaric acid 5-15%
  8. 8. CLASSIFICATION According to A.D Wilson I. Type 1: Luting agents II. Type 2: Restorative cements a)aesthetic filling material b)bis-reinforced filling material III Type 3: Lining, base and fissure sealing materials
  9. 9. 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
  10. 10. DISPENSING Commercially available in 2 forms 1. Encapsulated 2. Powder and liquid
  11. 11. 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 .
  12. 12. 2) MATERIAL PREPARATION  P/L ratio – 3:1 by weight paper pad or dry glass slab is used WHY? Powder and liquid is dispensed just before mixing
  13. 13.  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 .
  14. 14. CLINICALSTEPS In cervical abrasion cases
  15. 15. Pumice prophylaxis
  16. 16. Dentin conditioning
  17. 17. APPLICATION OF GIC
  18. 18. FINISHING Excess material must be trimmed from margins Hand instruments preferred to rotary instruments to avoid ditching Further finishing is done after 24 hours
  19. 19. SETTING TIME TYPE 1 4-5 Minutes TYPE 2 7 Minutes
  20. 20. SETTING REACTION  Stage 1) Dissolution  Stage 2)precipitation of salts, gelation and hardening.  Stage 3) hydration of salts
  21. 21. 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
  22. 22. STAGE 2) PRECIPITATION, GELATION AND HARDENING Calcium and aluminium ions bind to poly ions Initial 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 complexes Sodium ions – binds the powder to matrix
  23. 23. STAGE 3) HYDRATION OF SALTS  progressive hydration of matrix salts  Sharp improvement in physical properties
  24. 24. 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
  25. 25. 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
  26. 26.  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
  27. 27.  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
  28. 28. MODIFICATIONF OF GIC 1) Water settable GIC Liquid used is clean water Liquid is delivered in a freeze dried form ,which is incorporated into the powder 2) Resin modified GIC Powder 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
  29. 29. 3) Metal modified GIC GIC have been modified by addition of filler particles, to improve strength fracture toughness and resistance to wear Silver alloy admix / miracle mix This is made by mixing of spherical silver amalgam alloy powder with glass ionomer powder Cerment Bonding of silver particles to glass ionomer particles by fusion through high temperature sintering
  30. 30. 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 activated Adhesive system used with compomer is based on acid etch found with all composite resin
  31. 31. ATRAUMATIC RESTORATIVE TREATMENT PRINCIPLES 1.Removing carious tooth tissue using hand instruments only 2.Restoring the cavity with adhesive material(glass ionomer) Why GIC? Chemically binds to enamel and dentin Flouride release to prevent and arrest caries Biocompatible – no irritation to pulp and gingiva
  32. 32. 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
  33. 33. 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
  34. 34. ADVANTAGES  Inherent adhesion to tooth structure  Good marginal seal  Anticariogenic property  Biocompatibility  Minimal cavity preparation required  Restoration in primary dentition
  35. 35. DISADANTAGES  Low fracture resistance  Low wear resistance  Water sensitive during setting phase  Less esthetics compared to composites

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