removable orthodontic appliances. used for correction of different orthodontic defects defects of...
TRANSCRIPT
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Removable orthodontic appliances
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Removable orthodontic appliances
Used for correction of different orthodontic defects
Defects of bite - open bite
- crossbite
- under bite Defects of individual teeth - rotation
- protrusion, retrusion
-crowding
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Removabe orthodontic appliances are composed of acrylic body and clasps
The clasps are twisted of wire by special pliers (bird beak, cutter)
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The double helical spring
Made of 0.5 mm wire Double helical spring is maximizing the
elasticity of the protrusion spring
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The double helical spring ( Z-spring) is usualy used on rotated incisors
The spring is located on the tooth neck The right sided and left sided z springs
are fabricated accordingly
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The Adams clasp
0,7 mm stainless steel wire Adams clasp is used as anchorage of
the appliance Usualy situated on molars
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Twisting of Adams clasp 1st step
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2nd step
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3rd step
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The Adams clasps on the upper jaw
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The Adams clasps on the lower jaw
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No contact with palate
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The ball clasps 0,7 mm wire Used as anchorage of the removable
appliances Situated on incisors or in between
premolars
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The ball clasp on the upper jaw
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No contact with palate
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The ball clasp on the lower jaw
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The labial bow
Made of 0,7 mm wire Used for harmonic alignment of the
anterior segment
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The labial bow is situated is composed of three parts: Horizontal bow portion „U“ loops Retentive arms
The bow is situated between the canines
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The labial bow on the upper jaw
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The labial bow on the lower jaw
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Example of another modification of the labial bow
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The upper jaw with all retentive clasps
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The lower jaw with all retentive clasps
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All clasps are fixed on models by wax
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Before the application of acrylic models have to be put into the water isolation
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Application of acrylic
After choosing of the color we can start with application of acrylic
We change application of powder and liquid untill we have appropriate shape of the appliance
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Orange liquid Red liquid Acrylic powder
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The poymerization proceeds in the polymerization unit (10 min,55°C, 3-3,5 bar)
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Polymerized applicances are machined by milling frases.
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Instruments to produce an orthodontic appliance
rubber
Separating disc
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Machined appliance before polyshing
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Polyshing
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The upper jaw
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The lower jaw
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