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Orthodontic
Appliances
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Removable Fixed
Orthodontic Appliance
Active Passive Myo-functional
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Removable Appliance
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Removable orthodontic appliances are
those that can be removed by the patient.
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Active removable appliances are designed to
achieve tooth movement (mainly tipping)by
means of active components, e.g.wire springs,screws etc.
They are capable of generating tooth moving forces
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A removable appliance works by
tipping a tooth around its center
of resistance.
Mode of action
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I)Correction of anterior crossbite using
finger or Z-spring
Uses
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II) For canine retraction
Those are appliances used to bring
about distal movement of the canines
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III)Bring about minor overjet reduction and
anterior space closure using labial bows.
Activation is done by:
closing the loops
relieving the acryl palatal to the upper
anteriors
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IV)For arch expansion by the use of
expansion screws
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II- Passive Removable
Appliance
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Passive removable appliances: Passive
removable appliances are designed tomaintain teeth in their designated or present
position, e.g. space maintainers, retainers etc
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Retention is the phase of orthodontic treatment
which maintains the teeth in their
orthodontically corrected positions following
the cessation of active orthodontic tooth
movement.
Orthodontic retainers resist the tendency of
teeth to return to their pretreatment positions
under the influence of periodontal, occlusaland soft tissue forces, and continuing
dentofacial growth.
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Examples of passive removable appliances
Hawley retainer
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Wrap- around retainer
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Fixed retainer
Used in situations where prolonged retentionis planned e.g.diastema maintenance.
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Removable Fixed
Orthodontic Appliance
Active Passive Myo-functional
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Appliances that utilize the muscle action
produced when speaking, eating andswallowing to produce force to move the teeth
and align the jaws.
They are also known as orthopedic applianceswith names such as orthopedic corrector,
activator, bionator, Frankel, Herbst or twin
block appliances.
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The ideal age for the use of functional
appliances is between ages seven andeleven, when the cooperation level is the
highest
Rule of action: to correct malocclusions (toothmovement)and harmonize the shape of the
dental arch and oro-facial functions (growth
guide)
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Types
1- Lip Bumper
2- Bite planes
3- Activator
4 - Twin block
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A wire appliance used to move push the
lower molars back creating room for
crowded front teeth.
1- Lip Bumper
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Acrylic block covering the incisal or theocclusal surfaces of the teeth to prevent
their eruption
2- Bite planes
Anterior bite plane Posterior bite plane
Used for Correcting a Deep
bite
-Prevent Over-eruption
of Posterior Teeth
-Crossbite correction
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A mono-block removable appliance that
alters the posture of the mandible using
muscle and soft tissue forces to modify
the growth and guide eruption of theteeth.
Used to correct Class II in growing
patients(7-11 years
3- Activator
Mode of action: It has a lingual flange that
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Mode of action:It has a lingual flange that
brings the mandible in forward position
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It is made up of two components :an
upper and a lower plate, which work
together to posture the lower jaw
forward. This frees up the locked-in lower jaw
and encourages it to grow to its fullest
potential. The upper (and sometimes
lower) plate may also have an expansion
screw to widen the arch.
4- Twin Block
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Treatment with a Twin Block appliance
typically takes 12 to 18 months.
Uses: for class II correction in growingpatients for underdeveloped lower jaw.