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Removable orthodontic
appliances
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

Removabe orthodontic appliances are
composed of acrylic body and clasps
 The clasps are twisted of wire by special
pliers (bird beak, cutter)

The double helical spring
Made of 0.5 mm wire
 Double helical spring is maximizing the
elasticity of the protrusion spring

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

The Adams clasp
0,7 mm stainless steel wire
 Adams clasp is used as anchorage of
the appliance
 Usualy situated on molars

Twisting of Adams clasp
1st step
2nd step
3rd step
The Adams clasps on the upper
jaw
The Adams clasps on the lower
jaw
No contact with palate
The ball clasps
0,7 mm wire
 Used as anchorage of the removable
appliances
 Situated on incisors or in between
premolars

The ball clasp on the upper jaw
No contact with palate
The ball clasp on the lower jaw
The labial bow
Made of 0,7 mm wire
 Used for harmonic alignment of the
anterior segment

The labial bow is situated is composed of
three parts:
 Horizontal bow portion
 „U“ loops
 Retentive arms
The bow is situated between the canines
The labial bow on the upper jaw
The labial bow on the lower jaw
Example of another modification of
the labial bow
The upper jaw with all retentive
clasps
The lower jaw with all retentive
clasps

All clasps are fixed on models by wax

Before the application of acrylic models have to
be put into the water
isolation
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
Orange liquid
Red liquid
Acrylic powder

The poymerization proceeds in the
polymerization unit (10 min,55°C, 3-3,5 bar)

Polymerized applicances are machined
by milling frases.
Instruments to produce an
orthodontic appliance
Separating disc
rubber
Machined appliance before polyshing
Polyshing
The upper jaw
The lower jaw