Inlays and onlays, which are similar to a fillings, are custom-made pieces that are bonded to the damaged area of the tooth. They can be made of porcelain, gold, or composite resin. An inlay, is used inside the cusp tips of the tooth. An onlay is a more substantial reconstruction, similar to the inlay, but extends out over one or more of the cusps of the tooth.
The difference between inlays/onlays and fillings is that the inlays/onlays are stronger and are used when the decay is too large for a regular filling. Inlays/onlays are more of an investment, but will last longer.
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