Attaching inlay and onlay are considered “indirect” fillings. Meaning that they are fabricated outside the mouth (usually by a dental laboratory) and then bonded to the tooth by the dentist. This is in contrast to a “direct” filling. Which is applied directly to the cavity by the dentist in one office visit. Attaching inlay and onlay is used when old fillings need to be removed or replaced. A dental inlay is similar to a filling and fits inside the cusp tips (top edges) of the tooth. A dental onlay is more extensive and extends over the cusps of the treated tooth. Inlays and onlays, also called indirect fillings, are made from gold, porcelain, or composite materials and fill decayed or damaged teeth.
The primary distinction between an onlay and an inlay is that an onlay will cover a cusp of the tooth, whereas an inlay only fills the area between the cusps. … The costs are similar, but an onlay is a little cheaper than a crown. As such, an onlay is actually the preferred restoration when possible. Inlays and onlays are made of stronger materials than dental fillings since they are created outside of the mouth. They are so durable, that some inlays and onlays can last up to 30 years.
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