What is an inlay?
An inlay is a type of restoration that replaces missing tooth structure. This is an
option that the dentist may provide if they feel it's necessary as a good available
treatment. Inlays are usually larger than regular fillings due to the amount of tooth
structure missing. They are very strong and can last many years (comparable to
regular fillings).
They are made of a variety of materials. Gold alloys and other extremely strong
metal alloys are the strongest varieties of materials, but due to esthetic concerns
they may be avoided. The other variety of material, like fillings, are porcelain.
Porcelain is also a very strong material, but tend to be a bit more brittle than
metals. Because of this, porcelain inlays may be deemed inappropriate in the
very back of the mouth where the heaviest forces are. Porcelain, however, is the
ideal choice for those with esthetic concerns and are excellent restorations for
closer to the front of the mouth.
After the dentist prepares the tooth for the inlay an impression is made and sent
to a dental lab where the inlay is fabricated. While this is done, the tooth will have
a temporary 'inlay' placed for the time being until the following appointment, where
the permanent inlay is cemented into place.




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What is an onlay?
An onlay is essentially the same as the inlay in every respect, except for two: size
and shape. The onlay covers more surfaces of the tooth than an inlay does.
However, all other aspects are identical to the inlay.
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