orthodontic appliances or 411

8/12/2019 Orthodontic Appliances or 411

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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.

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