← All explanationsGlass ionomer cement

What is glass ionomer cement?

Glass ionomer cement is a dental material made from reactive glass powder and an acid component. Depending on the product, it can be used for fillings or as a luting cement. It can release fluoride, but does not suit every load-bearing situation equally.

For dental trainees & teams

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Glass and acid react

Conventional glass ionomer cement sets through an acid–base reaction. This differs from conventional resin-based composites.

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Different uses

Depending on the product and situation, it can be used for a filling, lining or luting. Formulations and purposes are not interchangeable.

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Fluoride is not complete protection

Fluoride release does not make a tooth immune to decay. Strength and wear limitations matter alongside oral care and caries risk.

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At a glance

What is in it?

In conventional formulations, glass powder and a polyalkenoic acid react to form a solid material.

What can it be used for?

Depending on the product, fillings, linings or securing restorations.

What are its limitations?

Heavily loaded areas may have different requirements. Fluoride release is not a guarantee against decay.

Knowledge in motion

Explained in 36 seconds.

Three steps. Straight to the point.
Explanations are also shown on screen.

Short film (German): What is glass ionomer cement?

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Silent film in German · English explanations in the three views above

Often confused

Glass ionomer cement or root cementum?

Glass ionomer cement is a manufactured dental material. Root cementum is natural hard tissue covering the tooth root.

Quick answers

Is it the same material as composite?

No. Conventional glass ionomers and composites differ in composition and setting. Resin-modified glass ionomers also exist.

Does fluoride release prevent new decay?

It does not provide certain protection from new decay. Cleaning, diet and individual risk remain important.

Do all these fillings last equally long?

No. Position, loading, material variety and conditions in the mouth affect durability.

At the practice

For your consultation

A question to discuss with Dr. med. dent. Niusha Barahmand Pour:

Why does the proposed material suit the position and loading of my defect?

At the practice, the findings, personal wishes and possible next steps are discussed through a consultation and examination.

The suitable filling material depends on the defect, loading and caries risk.

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Meet Dr. med. dent. Niusha Barahmand Pour

Learning for dental trainees & teamsUnderstand clinical terms and build your knowledge

Build on the simple explanation with clinical terms, key distinctions and a knowledge question.

Acid–base reaction: The chemical reaction through which conventional glass ionomer sets.
Luting cement: A material used to secure a restoration.
Resin-modified: A glass ionomer variety with additional resin components.

Know the difference

The similar words cement and cementum refer to very different things: a dental material and natural root tissue.

Knowledge questionWhat does fluoride release establish?

This question supports learning. It does not assess personal symptoms.

That oral care is no longer needed.
That the material can release fluoride, not that new decay is impossible.
That every load-bearing chewing surface should receive this material.

Show answer and explanation

That the material can release fluoride, not that new decay is impossible.

Fluoride release replaces neither care nor the selection of a material suited to the load.

Sources for further learning

Sources and context

Editorial research: 23 October 2026. This explanation covers general principles and does not replace a personal examination. Suitable treatment is discussed following individual assessment.