Inlays and onlays are partial crowns used to strengthen teeth by restoring their shape and preventing further damage. An inlay is used for minor damage not affecting the tooth's cusps, while an onlay is for more extensive damage. The procedure involves removing decay, taking a mold, and creating a porcelain, gold, or composite restoration off-site that is cemented into place two to three weeks later, with a temporary restoration in the meantime.

1. Inlays and Onlays
Inlays and onlays are often referred to as partial crowns. They
use the existing tooth as a base and fit the inlay or onlay onto the
tooth. This is done to strengthen the tooth, restore its shape, and
prevent further damage. An inlay is done when there is no
damage to the cusps of the tooth and the inlay can be placed
right on the tooth. An inlay is used when the damage is a little
more extensive.
The decayed area of the tooth is first removed during the
procedure. A mold of the tooth is then taken and sent to a dental
lab. They create a restoration made from porcelain, gold, or a
composite resin. The restoration takes about 2-3 weeks to make,
so a temporary inlay or onlay will be placed on the tooth for that
time. During your next visit the inlay or onlay will be placed
into your mouth and set with cement. Your tooth will look
natural and you or anyone else won't be able to tell the
difference.