This document summarizes glass ionomer cement (GIC). It discusses the composition of GIC powder and liquid, the setting reaction, clinical manipulation, advantages like adhesion and anticariogenic properties, disadvantages like sensitivity to moisture, and indications like luting and ART. It also describes types and modifications of GIC, including resin-modified and giomer versions.

1. DEPARTMENT OF PEDODONTICS AND
PREVENTIVE DENTISTRY

2. GUIDED BY
DR. Bharath Bhushan Sir
DR. Khushboo Barjatya Ma’am
DR. Binti Rani Chand Ma’am
DR. Preene Juneja MA’am
DR. Abhilasha M.Tripathi Ma’am
DR. Hariom Meena Sir
SUBMITTED BY
Priyanka Meena (2017-18 ) BATCH
ROLL NO. 50

3.  Introduction
 Classification
 Composition
 Setting Reaction of GIC
 Clinical Manipulation
 Advantages
 Disadvantages
 Indications
 Contraindications
 Modifications of GIC
 References

4.  GIC is a generic name for materials based on reaction of
glass powder and polyacrylic acid.
 Developed in 1970s to improve clinical performance
compared with silicate cements and to reduce the risk of pulp
damage.
 Tooth coloured material ,introduced by Wilson and
Kent .
 Considered superior to many other cements because it is
adherent and transparent.

5. A/C to Wilson and Mclean
 TYPE I : Luting crowns ,Bridges ,Orthodontic
brackets
 TYPE IIa : Esthetic restorative material
 TYPE IIb : Reinforced restorative material
 TYPE III : Lining cement ,base.

6.  POWDER :
 Alumina (Al2O3)
-16.6%
-Forms the skeletal structure
-Increase opacity
 Silica
-29%
-Increase translucency

7.  Calcium Fluoride
-34.2%
-Increase opacity
-Acts as flux
 Aluminum phosphate
-9.9%
-Decrease melting temperature
-Increase translucency
 Cryolite
-5%
-Increase opacity
-Acts as flux
 Fluoride
-Decrease fusion
-Anticariogenecity
-Increase translucency

8.  LIQUID:
- Poly acid (acrylic, itanoic ,maleic)
-The usual acid is a 40-55% solution of 2:1
polyacrylic acid copolymer in water or a
copolymer of maleic acid and poly acrylic acid .
-Tartaric acid is added to retain working time .

10.  Water settable GIC formulated with freeze dried
polyacrylic acid solid and glass powder ,mixed
with water or an aqueous solution containing
tartaric acid has extended working time .

12.  It has been described as an acid base reaction.
 The surface of all glass particles is softened by the
polyacrylic acid and both calcium and aluminum ions are
released through proton attack.
 Sodium & fluoride ions are also leached into aqueous
medium.
 Calcium poly salts are formed first, then followed by
aluminum poly salts which cross link with poly anion
chain.
`

13.  Set cement consists of unreacted powder particles surrounded
by silica gel in amorphous matrix of hydrated calcium and
aluminum poly salts.
 Calcium poly salts are responsible for initial set.
 Aluminum poly salts form the dominant phase.
 Water plays an important role in structure of cement .
 After hardening, fresh cement is extremely prone to the
cracking and crazing due to drying of loosely bound water.
 Hence these cements must be protected by the application of
varnish.

14.  1.PREPARATION OF TOOTH SURFACE :-
 The enamel and dentine are first cleaned with
pumice slurry followed by swabbing with
polyacrylic acid for 5 sec.
 After conditioning and rinsing , tooth surface
should isolate and dry.
 2. PROPORTIONING & MIXING :-
 Powder and liquid ratio is 3:1 by wt. Powder
and liquid are dispensed just prior to mixing.

15.  First increment is incorporated rapidly to
produce a homogenous milky consistency.
 Mixing done in folding method to preserve
gel structure.
 Finished mix should have a glossy surface.
3. PROTECTION OF CEMENT DURING
SETTTING :-
 Glass and ionomer cement is extremely
sensitive to air and water during setting .
 Immediately after placement into cavity ,
preshaped matrix is applied to it.

16. 4. FINISHING :
 Excess material should be trimmed from
margins.
 Hand instruments are preferred to rotary
tools to avoid ditching .
 Further finishing is done after 24 hrs
5.PROTECTION OF CEMENT AFTER SETTING
 Before dismissing the patient , restoration is
again coated with the protective agent to
protect trimmed area.
 Failure to protect for first 24 hrs results in
weakened cement.

19.  Inherent adhesion to the tooth surface .
 Good marginal seal.
 Anticariogenic property.
 Biocompatibility
 Minimal cavity preparation is required .

20.  Low fracture resistance
 Low wear resistance
 Water sensitive during setting phase
 Less esthetic compared to composite .

21.  As anterior esthetic restoration material for
class III & V restorations.
 For luting
 For core build up
 For eroded area
 For atraumatic restorative treatment.
 As an orthodontic bracket adhesive.
 As restoration in class I & II for decidous
teeth.
 Used in lamination /sandwich technique.

22.  High stress application
 Classes IV and II restorations
 Cusp replacement
 Core build ups with less than three sound
walls remaining .

23.  METAL MODIFIED GIC
-Silver alloy admix (silver amalgam alloy
particles mixed with glass particles ).Simmons
suggested this system clinically under the
name “MIRACLE MIX” .
 RESIN MODIFIED GIC
-GIC mixed with small quantity of resin such as
hydroxyethyl methacrylate to over come
moisture sensitivity

24.  Giomer :
-Based on pre-reacted glass ionomer
technology (PRG).
-It is fluoro alumino sillicate glass reacted with
polyalkenoic acid in water prior to inclusion
into silica filled urethane.
-Mainly indicated for restoration of root caries,
cervical caries , class V cavities.

25.  Nikhil Marwa
 Shobha Tandon
 Phillips