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# Luting cements for crowns and bridges

- Dental material

Luting cements fill the thin gap between a crown and the tooth and help hold it. The right one depends on the crown material and the tooth's shape.

Updated Nov 12, 2026

## Key points

- Cement fills and seals the gap; retention comes mainly from the preparation.
- Glass-ceramic crowns and veneers need resin cement.
- Remove excess cement, especially around implants.

## What it is

A luting cement fills the space between an indirect restoration (crown, bridge, inlay, post) and the prepared tooth, seals it, and adds retention. Conventional cements hold mainly by friction against the tooth's walls; adhesive resin cements bond to both tooth and restoration, which matters for thin glass-ceramic crowns and veneers that rely on bonding for their strength.

## Composition and properties

- Zinc phosphate: the oldest; strong but no adhesion and acidic as it sets.
- Zinc polycarboxylate: some chemical adhesion and gentle on the pulp, but weaker.
- Glass ionomer and resin-modified glass ionomer: bond to tooth and release fluoride; widely used for metal and zirconia crowns.
- Resin cements (total-etch, self-etch or self-adhesive): highest strength and bonding; required for etchable glass-ceramics and veneers.
- Temporary cements (zinc oxide with or without eugenol) hold provisional crowns and must come off easily.

## Uses, limits and safety

- Excess cement left under the gum around a crown or an implant crown is a known cause of inflammation and peri-implantitis.
- Eugenol temporary cement left on the tooth can weaken a later resin cement bond.
- A short or over-tapered preparation needs an adhesive cement, because friction alone will not hold the crown.

## Next step / Initial management

- Loose crown: keep it, and refer to the dentist promptly; do not glue it back with household adhesives.
- Gum inflammation around a newly cemented crown or implant crown: refer to the dentist to check for retained cement.
- Choose the cement for the material: resin cement for glass-ceramics; glass ionomer, resin-modified glass ionomer or resin cement for metal and zirconia.

## Test yourself

Think of the answer, then tap the question to see it.

## Which cement is required for an etched glass-ceramic veneer?

A resin cement, which bonds to both the etched, silane-treated ceramic and the tooth.

## Why is excess cement dangerous around an implant crown?

Cement left under the mucosa is a plaque trap and foreign body that causes peri-implant inflammation and bone loss.

## What is the main advantage of glass ionomer luting cements?

They bond chemically to tooth and release fluoride.

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## Connections

## Related 3

- [Glass ionomer cements](https://durgical.com/en/dentistry/glass-ionomer-cements/)
- [Bonding to enamel and dentine: etching and adhesives](https://durgical.com/en/dentistry/bonding-to-enamel-and-dentine-etching-and-adhesives/)
- [Dental ceramics and zirconia](https://durgical.com/en/dentistry/dental-ceramics-and-zirconia/)

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Educational content; it does not replace assessment by a dentist or doctor and is not a clinical instruction. For facial or neck swelling with difficulty swallowing or breathing, a knocked-out tooth or bleeding that will not stop, go to an emergency department at once.

Sources: [Dental Luting Cements: An Updated Comprehensive Review](https://pmc.ncbi.nlm.nih.gov/articles/PMC9961919/) (Molecules (PMC open access), 2023); [Glass Ionomer Cement](https://www.ncbi.nlm.nih.gov/books/NBK582145/) (StatPearls Publishing (NCBI Bookshelf), 2024).

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