Inlays, onlays and crowns are called indirect restorations, because the restoration is created outside the mouth, rather than being built in layers right into the teeth like a filling. The dentist takes impressions of the teeth, then the restoration is shaped to match the part of the tooth it’ll replace. The restoration is attached with dental cement.
An indirect restoration is an inlay if it covers part of a tooth, without extending to a cusp ( pointed tip of tooth ). It is an onlay if it reaches to replace a tooth’s cusp. And if it complete covers the top surface of the tooth, it is sometimes known as a crown or cap.
Inlays, onlays and crowns are more effective than fillings in reinforcing teeth to analogize biting forces, and more impervious to further rot. If a tooth’s original structure is too compromised to support a filling, these indirect restorations can supply wonderful, long-lasting, wonderful results.
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