Download Fix appliances, types of crown and bridges Fix appliances, types of

Fix appliances, types of crown
and bridges
Dr. Peter Hermann
Fix appliance
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Fix appliance replacing one or more
teeth that cannot be removed by the
patient. Substantial tooth preparation
is necessary for a conventional
restoration. The appliance usually
occupies no more space than the
original dentition.
General indication for crowns
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Badly broken down
teeth
Primary trauma
Tooth wear
Hypoplastic conditions
To alter the shape or
size or inclination of
teeth
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To alter the occlusion
As part of another
restoration
Root-filled teeth
Combined indications
Consideration of crown
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Physical properties, material
Clinical consideration
Odontotechnology
(Cost)
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Complete crown
Partial crown
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Metal
Metal-ceramic
platinum-bonded porcelain
cast-metal with cemented porcelain
facing
Metal-acrylic
Ceramic
Acrylic
Circonium
Glass-fiber reinforced polymer
Ceramic reinforced composite
Advantage of replacing
missing teeth
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Appearance
Ability to eat
Speech
Periodontal splinting
A feeling of completeness
Orthodontic retention
Restoring occlusal vertical dimension
Disadvantage of replacing
missing teeth
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Damage to tooth and pulp
Secondary caries
Failures
Effects on the periodontium
Cost and discomfort
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When teeth are missing the first
decision is whether replacing
them will do more good than
harm.
If the decision is for replacement,
the second consideration is
whether the prosthesis should be
fixed or removable or implant.
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The patient’s attitude, general
health, occupation, age and sex
should
all
be
taken
into
consideration.
The state of the teeth and the oral
hygiene will affect the final
decision as to whether a bridge
will be succesful.
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An abutment is a tooth or implant to
which a bridge is attached.
A retainer is a crown or other
restoration that is cemented (screwed)
to the abutment.
A pontic is an artificial tooth as a part
of a bridge.
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The saddle is the area of the
edentulous ridge over which the pontic
will lie.
A unit, when applied to bridgework,
means either a retainer or a pontic.
A connector connects a pontic to a
retainer or two retainers to each other.
Types of bridge
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Fixed-fixed bridge
( Rigid connector at both end of the
pontic.)
Fixed-movable bridge
( Rigid connector at one end, a
movable connector at the other end
which allows some vertical movements
of the abutment tooth.)
Types of bridge
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Cantilever bridge
( Provides support for the pontic
at one end only.)
Removable bridge
( They can be removed by the
dentist without being destroy.)
Minimal preparation bridge
( Direct, chemically retentive )
Principles of design
pontics
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To improve
appearance
To stabilize the
occlusion
To improve
masticatory
function
To improve the
phonetical function
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Cleansability
Appearance
Strength
Designs of pontic
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Hygienic (wash-through)
Dome-shaped
Ridge-lap
Saddle
Thank you for
your attention!