What is the role of water in GIC?

Water is an essential component of glass-ionomer cements, and has several functions in these materials [35]. It is the solvent for the dissolution of the polymeric acid, and allows it to ionise and donate protons, thereby behaving as a Bronsted-Lowry acid [35].

Is GIC water-based?

Being a true water-based material, GIC also is recognized as the only biological active restorative material that is currently available.

What is the liquid of GIC?

Chemistry and setting reaction. All GICs contain a basic glass and an acidic polymer liquid, which set by an acid-base reaction. The polymer is an ionomer, containing a small proportion – some 5 to 10% – of substituted ionic groups. These allow it to be acid decomposable and clinically set readily.

Does GIC need moisture control?

GIC-containing materials are technique sensitive and moisture control is mandatory for all types of GICs. Water contact at placement or at setting results in dissolution of the material. Light curing of resin-containing GICs should be done in steps when the thickness of the restoration exceeds 2 mm.

Is GIC hydrophilic?

Glass-ionomers have certain advantages over composites as fissure sealants, specifically that they are hydrophilic and dimensionally stable. Being hydrophilic they can absorb any fluid left at the bottom of the fissure and still adhere to the enamel.

Role of Water In GIC Setting | Important Topics - Target NEET MDS 2022 | Day 2 - 5 AM Club

Why do we apply varnish on GIC?

hence, sealing of GIC from aqueous media improves flexural strength. The cure lamp emitted heat, which may enhance the flexural strength of specimens coated with light-cured varnish.

Does GIC need bonding agent?

GICs have the inherent ability to adhere to enamel and dentine and can be placed in dental cavities with minimal preparation and without the need of a bonding agent.

Why GIC is water sensitive?

GIC is also susceptible to water loss sometime after filling; if left unprotected and exposed to the air, its surface will crack because of desiccation. Furthermore, desiccation and water contamination can continue to alter the structure of GIC for several weeks after cessation.

Why Vaseline is used after GIC restoration?

Similarly petroleum jelly also impedes the fluoride release, but to a very less extent. We suggest that in situations where the fluoride release property is more important than other properties it is better to coat the GIC with petroleum jelly or leave the restoration without any coating.

Does glass ionomer need isolation?

These materials are very hydrophobic by design, and so they don't tolerate even a little bit of moisture. The isolation requirements are much more stringent during the procedure. “With glass ionomer, on the other hand, they contain water. It's a necessary ingredient for the acid-base reaction.

What are the constituents of GIC?

The main components of a GIC are glass, polyacid, water and tartaric acid. The composition of the glass can be varied widely, giving many different properties, and, to add to this, there are numerous combinations of polyacids that are suitable for copolymerization.

How does GIC bond to metal?

The mechanism of bonding of glass ionomer cement involves chelation of carboxyl groups of the polyacids with the calcium in the apatite of enamel and dentin, but as in this study, metal crowns were luted to metallic dies, hence, such chemical interaction could not occur.

How does GIC release fluoride?

Fluoride release from GICs restorations following a continuous uptake process increases the fluoride concentration in saliva and in adjacent hard dental tissues. Thus, continuous small amounts of fluoride surrounding the teeth decreases demineralization of the tooth tissues.

How does GIC bond to dentine?

As a restorative material, GIC bond to the enamel and dentin via ionic and polar bonds, and the intimate molecular contact facilitates ion exchange of fluoride with the hydroxyl ions in the apatite of the surrounding enamel^5,39.

How does glass ionomer cement work?

Glass ionomer is essentially a flexible paste, that is used to form a tight seal between the internal tooth (exposed, due to a cavity) and the surrounding environment. It acts as a sealant, allowing the tooth to remain protected.

Does Vaseline hold crowns in place?

The best alternative is to use a little toothpaste or chapstick or vaseline to hold it. But before you use it, make sure to clean your temporary crown (from the inside) as well as the tooth, as this prevents the risk of trapping bacteria. Don't forget to remove your temporary crown while sleeping or eating.

Why Vaseline is used in dentistry?

Petroleum jelly and olive oil seem to be better alternatives to varnish when used for coating fresh glass-ionomer cement. They also are able to cover proximal surfaces restorations in class II and III cavities.

What is varnish in dentistry?

Fluoride varnish is a dental treatment that can help prevent tooth decay, slow it down, or stop it from getting worse. Fluoride varnish is made with fluoride, a mineral that can strengthen tooth enamel (outer coating on teeth).

How do you remove a GIC filling?

A very simple way to remove the cement is by lightly heating the band or crown with a Bunsen burner or torch and quenching it in water. This will crystallize the cement and allow it to be simply flaked out of the band or crown.

What is resin-modified glass ionomer?

Resin-modified glass ionomers (RMGI) were developed in an attempt to improve mechanical properties, decrease setting time, and attenuate moisture sensitivity. Simplistically, RMGIs are a hybrid of glass ionomers and composite resin, and thus contain acid-base and polymerizable components.

How is GIC mixed?

Glass ionomer cement (GIC) is a restorative material that is mixed prior to placing it in the prepared cavity. The mixing process can be mechanical or by hand. The material sets through a simple acid–base chemical reaction.

Do we etch GIC?

The results suggest that phosphoric acid etching of GIC prior to the placement of composite resin does not improve the sealing ability of sandwich restorations. The RMGIC was more effective in preventing dye penetration at the GIC-resin composite- dentin interfaces than CI.

What does GIC bond strongest to?

Glass ionomer cement (GIC) bonds chemically to both enamel and dentin. In addition its high fluoride content makes enamel more resistant to caries. The purpose of this study was to evaluate the bond strength and durability of GIC when used as a bonding agent in the placement of orthodontic brackets.

Why is a plastic spatula used to mix GIC?

Flat smooth fore-end of the spatula is better for mixing the medicine well. Made up of good quality plastic material Efficient in mixing GIC Does not interfere with the composition of the cement.