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# Dental ceramics and zirconia

- Dental material

Ceramics give crowns a natural look. Glassy ceramics look best and are bonded on; zirconia is the strongest and suits back teeth and bridges.

Updated Nov 12, 2026

## Key points

- More glass: more beauty, needs bonding; more crystal: more strength.
- Glass-ceramic: etch, silane, resin cement.
- Zirconia: strongest, not etchable.

## What it is

Dental ceramics range from very glassy, translucent porcelains to dense polycrystalline zirconia. The more glass a ceramic has, the more natural it looks and the more it relies on bonding to the tooth for strength; the more crystalline, the stronger and more opaque it is. Many are now milled from blocks with CAD/CAM.

## Composition and properties

- Feldspathic porcelain: the most lifelike, but brittle; used for veneers and as a layer over metal or zirconia.
- Glass-ceramics (such as lithium disilicate): strong and aesthetic; etched with hydrofluoric acid, primed with silane and bonded with resin cement.
- Zirconia: the strongest; cannot be etched, so it is air-abraded and bonded with a phosphate-monomer primer or cemented conventionally.
- Metal–ceramic crowns: a metal coping under porcelain, long track record.
- Ceramics are brittle: they fail by chipping or fracture rather than bending.

## Uses, limits and safety

- Layered porcelain over zirconia can chip; full-contour (monolithic) zirconia chips far less.
- Rough or unglazed ceramic wears the opposing teeth quickly; polished or glazed surfaces are kinder.
- Hydrofluoric acid is highly toxic and corrosive: it is used only on the restoration, outside the mouth, with protection.

## Next step / Initial management

- Front teeth and veneers: glass-ceramics bonded with resin cement; back teeth and bridges under heavy bite or bruxism: zirconia.
- Chipped or cracked ceramic crown: keep the pieces and refer to the dentist; small chips may be repaired.
- Skin or eye contact with hydrofluoric acid: wash at once and seek urgent medical care.

## Test yourself

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

## How is a lithium disilicate crown prepared for bonding?

It is etched with hydrofluoric acid, treated with a silane primer and bonded with resin cement.

## Why is zirconia not etched with hydrofluoric acid?

It has no glass phase for the acid to dissolve, so it is air-abraded and primed instead.

## What is the main way ceramic crowns fail?

By chipping or fracture, because ceramics are brittle.

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## Connections

## Related 3

- [Luting cements for crowns and bridges](https://durgical.com/en/dentistry/luting-cements-for-crowns-and-bridges/)
- [Bonding to enamel and dentine: etching and adhesives](https://durgical.com/en/dentistry/bonding-to-enamel-and-dentine-etching-and-adhesives/)
- [Gypsum, waxes and dental alloys](https://durgical.com/en/dentistry/gypsum-waxes-and-dental-alloys/)

[← All of dentistry](https://durgical.com/en/dentistry/)

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: [Zirconia Biomaterials](https://www.ncbi.nlm.nih.gov/books/NBK493144/) (StatPearls Publishing (NCBI Bookshelf), 2023); [Glass-Ceramics in Dentistry: A Review](https://pmc.ncbi.nlm.nih.gov/articles/PMC7084775/) (Materials (Basel) (PMC open access), 2020); [Ceramics for Dental Applications: A Review](https://pmc.ncbi.nlm.nih.gov/articles/PMC5525170/) (Materials (PMC open access), 2010).

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