Crowns & Bridges are the
two ways to repair or replace the missing teeth.
Crown or a "cap" is a restoration that is used to replace
a single tooth. A series of crowns can be used to replace several
teeth. The Crown can be made to fit over an existing tooth or can be
attached to a dental implant. A crown (or cap) completely covers a
damaged tooth to restore it to its normal size and shape.
Crowns are often
recommended in conjunction with root canal treatment, as
the tooth tends to become brittle and is more likely to fracture.
Crowns strengthen and protect the remaining tooth structure and
improve the appearance of your teeth.
are used to restore both anterior and posterior teeth that have been
broken or are at high risk of doing so due to over-sized old
fillings or fractures.
a dental crown can be placed the tooth must first be trimmed so it
is tapered in shape. This tapered aspect of the tooth will extend up
into the dental crown's center and is a very important factor in the
crown's stability. After the needed shape has been achieved your
dentist will take an impression of the tooth, which in turn is sent
to a dental laboratory, which will create the crown. Once the dental
lab has completed your crown your dentist will cement it in place.
(decay, Dental caries) start mainly as a result of bacterial action
on the food particles that stick to teeth. Certain types of bacteria
break down these food particles, producing acidic substances, which
erode the enamel of the teeth and roughen it. The enamel is made up
of calcium compounds mostly) More food particles stick to these
roughened areas which get colonized by the bacteria, eroding the
enamel and then the second layer, dentine.
or caries usually starts on the crown and the filling or
restoration is limited to the crown if the decay has not
reached the pulp. Once the decay (and bacteria) get into
the pulp, the root canal has to be cleaned,
disinfected and filled. This may require one or many sittings
depending on whether the infection is limited to the root canal
or if it has spread into the bone, beyond the root canal.
amalgam (a mixture of mainly silver and mercury), composite resins,
Glass ionomers etc are some of the main materials used for restoring
decayed teeth. Metals and ceramic, prepared to the exact
dimensions of the cavity also are used.
Bridge is a way to replace one or more missing teeth and is
permanently fixed in your mouth. Spaces left by missing teeth affect
the rest of your teeth. Replacement of missing teeth makes it easier
to chew, improves your appearance and also keeps your teeth, gums
and jaws healthy. Even if only one tooth is out of place other teeth
may slowly shift, in turn changing the way your teeth meet (your
maximum number of teeth that can be replaced by a bridge is two to
three. Much depends upon the health of the remaining teeth and in
which area the teeth are missing. Bridges are fixed on non-removable
prosthesis constructed to replace one or more missing teeth. The
teeth on either side of the existing space are used to anchor the
bridge to restore functionality as well as aesthetics.
porcelain over metal bridges as well as full porcelain and
resin-based bridges are available producing the best results
depending on the particular situation and requirement.
Missing & gaped teeth replaced with Bridge
The missing tooth in the
above pictures could be replaced with a bridge. The teeth either
side of the gap are prepared for crowns that will support a bridge
across the gap.
Here, the finished
bridge has been placed in the mouth using permanent glue.
a normal bridge that is attached to teeth on both sides, a
cantilever bridge is one that is attached only on one side to the
remaining teeth. The other side is free or unattached. These
cantilever bridges are indicated when the tooth to be replaced is
the last one and does not have remaining teeth beyond it. These
bridges have poor prognosis in the long run.
The resin bonded fixed partial dentures are those that are bonded to
adjacent teeth using acrylic resins. Unlike the conventional bridges
these resin bonded ones need less reduction of the adjacent
remaining teeth and are therefore more conservative.