> Overlay/Onlay > Crown
- Fillings are
indicated when less than half of the biting surface
is lost because of decay or
previous fillings. These fillings are usually going
to be made from tooth colored resin, silver or gold.
Fillings require strength in the tooth to hold them
in place. The longevity of a filling of any type is
shortened the larger the amount of tooth structure
that is missing.
Covering the biting surface is necessary when more
than half the biting surface is lost from decay, broken
tooth structure or large fillings. An Overlay/Onlay
will replace the biting surface while at the same
time preserve sound tooth
structure closer to the gum line. Overlays/Onlays
will impart some strength back to a tooth
- Crown will replace
the biting surface and all other exposed outer tooth
structure. Crowns are necessary when most of the remaining
tooth structure requires strengthening. Crowns can
be made from all porcelain, a metal substrate with
porcelain covering the whole tooth or all metal. Most
back teeth benefit from the porcelain and metal type.