Glass ionomer cement

details about GIC

1. SRI AUROBINDO COLLEGE OF DENTISRY DEPARTMENT OF PEDODONTICS AND PREVENTIVE DENTISTRY

2. GLASS IONOMER CEMENT 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 CONTENTS

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. INTRODUCTION

5. A/C to W ilson and M clean TYPE I : Luting crowns ,Bridges ,Orthodontic brackets TYPE IIa : Esthetic restorative material TYPE IIb : Reinforced restorative material TYPE III : Lining cement , base. Classification

6. POWDER : Alumina (Al 2 O 3 ) -16.6% -Forms the skeletal structure -Increase opacity S ilica -29% -Increase translucency Composition

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 : - P oly 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 .

9. 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 .

10. Setting reaction for GIC

11. 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. `

12. 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.

13. 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. CLINICAL MANIPULATION

14. 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.

15. 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.

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

17. Low fracture resistance Low wear resistance Water sensitive during setting phase Less esthetic compared to composite . DISADVANTAGES

18. 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. INDICATIONS

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

20. 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 MODIFICATIONS OF GIC

21. 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.

22. Nikhil Marwa Shobha T andon Phillips References:-

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