Ceramic onlays in Warners Bay — a conservative alternative to crowns

Why an onlay can beat a full crown

When a back tooth has lost a cusp, has a failing large filling, or has cracks running through the chewing surface, the traditional answer was always a full crown — shaving the entire tooth down to a peg and capping it. That works, and we still place full crowns when they're the right answer.

But there's a more conservative middle ground: a ceramic onlay. Onlays cover only the damaged parts of the tooth — typically the chewing surface and any broken cusps — and bond to the side walls of the tooth that are still healthy.

The result is a restoration that's almost as strong as a crown, looks better, and preserves significantly more of your natural tooth for the long term.

When an onlay is the right tool

Onlays suit teeth where:

• One or more cusps are broken or failing, but the rest of the tooth is structurally sound
• An old large filling is breaking down, but a full crown feels like overkill
• A crack runs across the chewing surface but hasn't extended into the root
• A previous crown has come off but enough healthy tooth remains for a more conservative replacement

If too much of the tooth's side walls have been lost, a crown is usually the more predictable answer — we'll always tell you which option we think is best for the specific tooth.

How an onlay is made

Modern onlays are designed digitally and milled from a single block of high-strength ceramic — most often lithium disilicate (e.max) for excellent aesthetics or zirconia when extra strength is needed. The fit is precise, the colour matches your surrounding teeth, and the surface is polished to a smooth finish that feels natural to the tongue.

We use digital scanning at every step. No goopy impression material, no awkward gagging — just a quick 3D scan of the prepared tooth and the bite, which is sent directly to the lab.

The bonding step matters

The performance of a ceramic onlay depends almost entirely on how well it's bonded to the underlying tooth. Done well — under rubber dam isolation, with proper etching and adhesive technique — the bond is exceptionally strong and the onlay performs as well as the original tooth.

We don't shortcut this step. Modern ceramic onlays are unforgiving of contamination, and the difference between a 5-year and a 15-year onlay is almost always the bonding appointment.

Living with an onlay

Onlays feel like natural teeth. Day-to-day care is the same as your other teeth — twice-daily brushing, daily flossing, regular check-ups. We'll monitor the onlay at every recall to make sure the margins are sealed and the bite hasn't changed.

If you grind, we'll usually recommend a custom night splint to protect the onlay (and the rest of your teeth) from premature wear or fracture. For heavy grinders, we may also discuss Botox for the masseter muscles as part of the long-term plan.