Sagittal
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Crowding may be alleviated by the use of
sagittal appliances. Sagittal appliances move the anterior
teeth forward or distalize the molars. Adams clasps are on the
first bicuspids and first molars. Maxillary sagittals position
twin expansion screws at the mesial of the first molar, the
appliance is cut into 3 sections to allow for expansion. The
mandibular appliance positions the screws in the cuspid/bicuspid
area. A third midline screw may be added if transverse
expansion is desired. Springs may also be incorporated to move
the canines into position as space becomes available. Also
acrylic coverage on the posterior teeth may be incorporated to
relieve maxillary / mandibular occlusal contact during treatment. |
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Jackson
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The Jackson is a lower apliance used to upright
posteriors and gain anterior space. An 0.045" wire is formed
into a U shape and is embedded into lingual posterior plates.
Two pair of ball or arrow clasps aid in retention and lingual
anterior crossover springs are used to align the incisors.
This design allows for either greater expansion force in the first bicuspid
area and limited molar expansion or greater molar expansion and
limited bicuspid expansion depending on the case. The spring action of this
appliance allows for significant expansion from a single activation |
"W" Expander Designs:
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| These appliances are very similar in
design and function. The body wire may be adjusted for
expansion, molar rotation, fan type expansion, arch constriction and
buccal root torque. |
"W" Arch
|
The "W" Arch is the simplest of the "W" expander
design appliances and may be used on the maxillary or mandibular
arch. |
Porter
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The Porter is simply a removeable "W" Arch |
Quad Helix
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This maxillary appliance is the same overall
shape as the "W" Arch but with the inclusion of four helixes. Two at
the subgingival areas distal to the molar bands and two at the
anterior corners near the rugae. |
