There are cases where a tooth needs a larger restoration than a regular filling, but the whole tooth does not have to be covered with a crown. We call these restorations inlays, onlays and overlays.
What this restoration is
It is a restoration made outside the mouth and then bonded to the tooth. It is not built in layers inside the cavity like a regular filling. First the tooth is prepared, an impression or a scan is taken, and then a restoration fitted to the lost part is bonded.
In practice it gives the tooth back the shape it lost: the wall, the contact point with the neighboring tooth, and the chewing surface facing the opposite tooth. All this without wrapping the entire tooth.
When it may be suitable
It is considered when there is a large cavity, a wide old restoration, or a tooth wall that needs reinforcement, and enough healthy tooth structure still remains around it. It is not an automatic replacement for every filling, and not an automatic replacement for every crown.
If too little tooth remains, this restoration will not hold as needed. Then a crown is discussed. If the cavity is small and the walls are strong, a regular filling may be enough. The suitable type is chosen after seeing the tooth itself.
What treatment looks like
There are usually two visits, sometimes more:
- The diseased tissue is cleaned and the tooth is shaped to receive the restoration
- An impression or a scan is taken
- A temporary restoration is placed until the final piece is ready
- The restoration is bonded and the bite is checked
Mild sensitivity for a few days after bonding can happen. If the tooth feels high when biting, do not “get used to it”. Come back for polishing. I wrote about sensitivity after a new restoration in the article on sensitivity after a filling.
What it does not do
- It does not prevent a new cavity at the margins. Daily cleaning is still needed next to it. I wrote about a cavity next to an existing restoration in the article on secondary caries
- It does not replace a tooth that is already missing. A missing tooth has a different path, such as a restoration on an implant. I wrote about that in the article on implant, abutment and crown
How to care for it at home
Use a soft brush, light pressure, and clean also next to the margins. In the first days after bonding it is better not to bite something very hard on that side.
If you feel a sharp edge, a new gap, or that the restoration is moving, return to the clinic. Do not try to glue it at home.
Bottom line
This is a partial restoration that does not wrap the entire tooth. Its purpose is to restore the lost anatomical structure of the tooth. With it, teeth that were once considered lost can be restored, as can teeth whose destruction was so extensive that root canal treatment was considered.
I also explain these details at the end of the examination: how much tooth remains, which type is suitable, and what matters in the days after bonding.
Sources
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The American Dental Association explains that a crown covers a weak tooth or a tooth after major treatment, and that not every tooth needs full coverage. The choice depends on how much tooth remains and on its role in chewing.
ADA MouthHealthy – Crowns -
A professional review of partial restorations describes inlays, onlays and overlays as restorations made outside the mouth and bonded to the tooth, in order to restore the missing part and preserve natural tooth structure when possible.
PMC – Partial ceramic restorations
The information in this article is intended for educational purposes only and does not constitute a substitute for personal medical advice. It is recommended to consult a qualified physician before making any treatment decision.