A cast restoration that covers the proximal surfaces and most of the occlusal surface is called an onlay.
An onlay is related to an inlay in the sense that it is related to the filling of crowns. But, unlike an inlay, an onlay is modelled and formed outside of the mouth by a dental technician or a dentist.
It is made according to a particular measurement and it fits in the inside and over the outside regions of the tooth, where they are required.
The onlay is attached to the tooth using a special substance called dental cement. It is put under light to harden it quickly and fix it properly.
Therefore, the cast restoration that covers the proximal surfaces and most of the occlusal surface is called an onlay.
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