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| Amalgam:
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Made of: |
Mercury mixed with silver, tin,
zinc and copper. Mercury is nearly 50 percent of
the mixture. |
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Types: |
Traditional (non-bonded), bonded
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Used for: |
Fillings in back teeth |
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Lasts: |
At least seven years, usually
longer |
|
Costs: |
The least expensive type of
restorative material (Not
done at the International Dental Centre) |
Advantages
 | Amalgam fillings are strong and
can withstand the forces of chewing. |
| They are inexpensive and
convenient. |
| The filling can be completed
during one dental visit. |
Disadvantages
| Amalgam doesn't match the color
of your teeth. |
| Healthy parts of your tooth must
often be removed to make a space large enough to
hold an amalgam filling. |
| Amalgam fillings can corrode over
time, causing discoloration where the filling meets
the tooth. |
| A traditional (non-bonded)
amalgam filling does not bond to the tooth. It just
sits in a pocket created by your dentist.
|
| Some people may be allergic to
mercury or be concerned about its effects, although
research shows the amount of mercury exposure
from fillings is comparable to what people get from
other sources in the environment. |
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Composite Resin:
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Made of:
|
A mixture of
plastic and fine glass
particles. |
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Types:
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Direct or
indirect |
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Used for:
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Small and
large fillings, especially
in front teeth or the
visible parts of teeth;
inlays |
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Lasts:
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At least five
years |
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Costs:
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Prices:
£ 18 |
Advantages
| Your
fillings or inlay will be
invisible. Your dentist
chooses a resin that matches
the color of your teeth.
|
| A filling
can be completed during one
dental visit. An inlay may
require two visits.
|
| Composite
fillings can bond directly to
the tooth, making the tooth
stronger than it would be with
an amalgam filling.
|
| Less
drilling is involved than with
amalgam fillings because your
dentist does not have to shape
the space as much to hold the
filling securely. The bonding
process holds the composite
resin in the tooth.
|
| Indirect
composite fillings and inlays
are heat-cured, increasing
their strength. |
| Composite
resin can be combined with
glass ionomer to provide the
benefits of both materials.
|
Disadvantages
| Although
composite resins have become
stronger and more resistant to
wear, it's not clear whether
they are strong enough to last
as long as amalgam fillings
under the pressure of chewing.
|
| These
fillings take 10 to 20 minutes
longer, or sometimes more, to
place than amalgam fillings
because each thin layer of the
filling must be cured, or
hardened, using a visible blue
light. |
| Indirect
fillings and inlays take at
least two visits to complete.
Your dentist takes impressions
at the first visit and places
the filling or inlay at the
second visit. |
| In large
cavities, composites may not
last as long as amalgam
fillings. |
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Glass
Ionomer
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Made
of:
|
Acrylic
and a
component
of
glass
called
fluoroaluminosilicate
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Types:
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Traditional,
resin-modified
or
hybrid
composite,
metal-reinforced
|
|
Used
for:
|
Most
commonly
used
as
cementation
for
gold
inlays,
but is
also
used
for
fillings
in
front
teeth.
As
filling
material,
glass
ionomer
is
typically
used
in
people
with a
lot of
decay
in the
part
of the
tooth
that
extends
below
the
gum
(root
caries).
It is
also
used
for
filling
baby
teeth
and as
a
liner
for
other
types
of
fillings.
|
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Lasts:
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Five
years
or
more
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Costs:
|
Prices:
£ 12 |
Advantages
|
Glass
ionomer
matches
the
color of
the
teeth,
although
it does
not
always
match as
precisely
as
composite
resin.
Resin-modified
glass
ionomer
is
usually
a better
match
than
traditional
glass
ionomer.
|
|
In some
cases,
no
drilling
is
required
to place
a glass
ionomer
filling.
This
makes
this
type of
filling
useful
for
small
children.
|
|
Glass
ionomers
release
fluoride,
which
can help
protect
the
tooth
from
further
decay.
|
|
Glass
ionomer
restorations
bond to
the
tooth,
helping
prevent
leakage
around
the
filling
and
further
decay.
|
Disadvantages
|
Traditional
glass
ionomer
is
significantly
weaker
than
composite
resin.
It is
much
more
susceptible
to wear
and
prone to
fracture.
|
|
Traditional
glass
ionomer
does not
match
your
tooth
color as
precisely
as
composite
resin.
|
|
If you
are
receiving
a
resin-modified
glass
ionomer
filling,
each
thin
layer
needs to
be
cured,
or
hardened,
with an
ultraviolet
light
before
the next
layer
can be
added.
This
makes
the
tooth
stronger,
but can
lengthen
the time
of the
dental
appointment.
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