What Is an Onlay?

An onlay is a type of indirect dental restoration that repairs a tooth with extensive decay or damage, particularly when the damage is too significant for a filling but not severe enough to require a full crown. Sometimes referred to as “partial crowns” because they cover one or more cusps (the raised points) of the tooth.

Unlike traditional fillings, which are applied directly to the tooth, onlays are fabricated outside the mouth—typically from materials such as porcelain, composite resin, or gold—before being bonded onto the affected tooth.

The Onlay Procedure: What to Expect

1. Initial Examination and Preparation – Your dentist will assess the extent of decay or damage using an examination and possibly X-rays. If an onlay is deemed the best solution, the affected area will be prepared by removing decayed or weakened tooth material.
2. Impressions and Temporary  – A digital or physical impression of your tooth will be taken to create a custom temporary. While your onlay is being fabricated in a dental lab, a temporary may be placed to protect your tooth.
3. Final Placement – During a follow-up appointment, your temporary is removed, and the permanent one is bonded securely to your tooth. Your dentist will ensure a precise fit and proper bite alignment.

Onlay vs. Inlay: What’s the Difference?

Onlays and inlays are similar in that they are both indirect restorations, but they serve slightly different purposes. An inlay fits within the grooves of a tooth but does not cover the cusps, while an onlay extends over one or more cusps for greater coverage.

Benefits of Onlays

• Preserve More Natural Tooth Structure – Compared to crowns, onlays require less removal of healthy tooth material.
• Durability – Particularly those made from porcelain or gold, are highly durable and can last for many years with proper care.
• Aesthetics – Tooth-coloured onlays blend seamlessly with natural teeth, providing a more natural-looking restoration.
• Stronger Bonding – They help strengthen the tooth by providing additional support and preventing further damage.

Caring for Your Onlay

Maintaining your restoration is similar to caring for your natural teeth. Regular brushing, flossing, and routine dental check-ups are essential to ensure the longevity of your restoration. Avoid chewing hard objects and consider wearing a nightguard if you grind your teeth.

Is an Onlay Right for You?

If you have a damaged tooth but want to preserve as much of its natural structure as possible, an onlay may be an ideal choice. At Larkham House, our skilled dental team will assess your condition and recommend the best treatment tailored to your needs.

For more information or to schedule a consultation, contact Larkham House today. We’re here to help you achieve a healthier, stronger smile.

Onlay preparation & fitting example.