Not every damaged tooth needs a full crown. It’s a question we get a lot at our Brisbane CBD dental practice once a patient sees their x-ray or hears the word “crown” for the first time — do I actually need the whole tooth covered, or is there a smaller option? The honest answer is: it depends on how much healthy tooth is left, and where.
What’s the difference between a crown and an onlay?
A crown covers the entire visible part of your tooth, like a cap. It’s the right call when there isn’t enough strong, healthy tooth structure left to support anything smaller — often after a large filling has failed, a significant crack, or extensive decay.
An onlay covers less. It restores the chewing surface and one or more of the cusps (the pointy bits on top of your back teeth) while leaving more of your natural tooth in place. Think of it as sitting somewhere between a filling and a full crown — more coverage than a filling, less than a crown.
Neither option is “better” across the board. They solve different problems — which is exactly why, as a Brisbane CBD dentist offering both dental crowns and onlays, we assess each tooth individually rather than defaulting to the bigger treatment.
How we decide which one your tooth needs
A few things guide the decision, and we’ll always talk you through what we’re seeing before recommending either:
- How much healthy tooth structure remains. The more of your own tooth we can keep and still get a strong result, the more likely an onlay is suitable.
- Where the tooth sits and the bite forces on it. Back teeth carry more chewing load, which affects what will hold up long-term.
- Whether there’s a crack extending below the gumline. This can change the whole plan, sometimes ruling out an onlay.
- What’s happening cosmetically, particularly for teeth that show when you smile or talk.
We base this on your x-rays, a close clinical look, and sometimes photos taken during the appointment — not a one-size-fits-all rule.
What to expect either way
The process is similar for both. We prepare the tooth, take a scan or impression, and fit a temporary restoration while your crown or onlay is made. Most people find the appointment straightforward, and we’ll always explain what to expect for your tooth specifically before we start.
Both crowns and onlays are designed to last many years with good care and regular check-ups — how long depends on your bite, your oral hygiene, and the tooth itself, so we won’t put a number on it without seeing your case. If you’d like more detail on the process and what’s involved, our Complete Guide to Dental Crowns covers costs, benefits and what to expect in more depth.
A few common questions
Is an onlay cheaper than a crown? It depends — onlays typically use less material and less chair time, though the exact cost depends on your tooth and situation. We’ll give you a clear, written quote before any treatment begins.
Can I choose whether I have a crown or an onlay? Not always. It comes down to how much healthy tooth is left, so it’s a clinical decision rather than a preference — but we’ll always explain why we’re recommending one over the other.
Do onlays need replacing sooner than crowns? Not necessarily. With good care, both can last many years. An onlay is a more conservative treatment, not a shorter-lived one.
Worried about a filling that’s failed, or a crack you’ve noticed?
If your dentist has mentioned you might need a crown — or you’ve noticed a crack, sensitivity, or an old filling that’s seen better days — book a consultation with Dentistry on George, your Brisbane CBD dentist for dental crowns and bridges. We’ll walk you through your x-rays and talk about what’s actually best for your tooth, not just the default option.
Book an appointment with Dentistry on George today.
