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 Dental
Restoration
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In
the past, Operative Dentistry was involved only
in metal or plastic fillings; however, the technology
of dental materials helps us to be able to provide
a wide range of treatments such as tooth whitening,
ceramic fillings, or porcelain laminated veneers.
All of these treatments are highly recommended
for patients with cosmetic concerns. The treatment
will provide changing of tooth colour and shape
which will help the tooth function better.
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What
are dental crowns ? [ teeth caps or
dental capsules ]
A crown is a lab made, above the gum part of
a tooth made from ceramic (metal and ceramic
or gold or other material) and basically caps
what remains of the original tooth.As the term
crown suggests, a crown 'crowns' a tooth or
'caps' that which remains of the original tooth
above the gum.Crowns usually cover most of the
extrudingpart of the remaining original tooth.
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When
are crowns used ?
A dental crown is used when a tooth is broken
or decayed to such extent where too little of
the original tooth remains to be able to support
or hold a filling.A crown may be used to repair
a damaged or decayed tooth, to better the cosmetic
appearance of a broken or decayed tooth and
also to strengthen a tooth weakened by decay,
breakage or injury.
Why not a filling instead of a crown
?
In theory, if a large part of a tooth has gone
missing or has to be drilled away due to decay,
standard amalgamate or composite filling material
could be used to make up for the missing part.The
problem is that this would be similar to building
a whole house wall using cement and no bricks
or steel strengthening rods.Place the roof on
this wall and you risk a collapse either by
the roof's weight, or by any wobbling the wall
might suffer when the wind blows at the roof.
Same with teeth and just substitute the weight
of the roof by the sheer pressure exerted when
one bites onto something.A large filling would
have a tendency to crack or split.Also - and
this is the main reason - no amount of manual
filling or sculpting by the dentists can get
the freeform filling material into such a perfect
mouth fitting shape as the lab made crown made
from a cast form taken of both the lower and
upper jaw.So where there is too much tooth missing,
it is easier, and much more practical to get
a crown made than to plaster up the hole with
filling material.
Last but not least - a dental crown is made
in the lab from the cast and is modeled, baked,
filed and heated outside of your mouth - which
means much less fiddling around on and around
the broken or decayed tooth thus exposing the
already weakened area to even more pounding.And
it's much more easier to prepare and mold and
cast a tooth outside of the mouth than inside.
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are dental crowns prepared for, made and then
fitted :
Usually this would be done in 2 sessions
First session:
the tooth needing a crown would be prepared
by means of filing away any broken edges, treating
the root canal if necessary, and in general
preparing the tooth to be in top shape to receive
the crown.Sometimes - if too much of the original
tooth is missing above the gum a metal rivet
might be cemented into the root canal for the
capping crown then to be cemented onto (Not
to be confused with implants)When all this is
done a cast will be taken to get the exact form
of the teeth and to allow the laboratory technicians
to make an exact replica - or a precise copy
of the crown which when fitted will fit with
the existing teeth and the mouth bite.Mostly,
a temporary crown or a several teeth spanning
bridge (a tooth out of the tube or fast made
by the lab ) is fitted for the 3 or 4 days whilst
one waits for the crown to be made by the lab.
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Second
session :
Once the crown is ready, the temporary crown
or bridge is removed and the lab made crown
is fitted by the dentists and tested for an
exact fit.If the fit is not 100% exact then
either the dentists and sometimes the lab technician
will do a bit more filing (on the crown) to
get the precision needed.
Once the crown fits perfectly, and the patient
and dentist are both happy that the jaw can
close normally and the tooth has a good bite
grip, with no part of the new crown too high
or grating improperly on the teeth below or
above it - it is then cemented permanently into
place.
How are ceramic crowns made ?
A thin layer of high noble metal is prepared
to exactly fit over the prepared tooth and then
porcelain is layered and fired onto this in
a ceramic oven at over 2000 degrees, till the
desired shape and size is achieved.
How long can a dental crown last ?
A crown can last from 5 to 15 years or even
longer.This depends on how big the crown was
as compared to the size of what remained of
the original tooth, where it is in the mouth,
(hence how much pressure will be exerted - molars
exert much more pressure than incisors) what
material it was made from and many other factors
concerning the care one has for their teeth
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ข้อความนี้เพื่อใช้บริการ
- อุดฟันโลหะด้านละ 250 บาท
- สีเหมือนฟันด้านละ 300 บาท
นัดหมายล่วงหน้าเท่านั้น
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