Labial bow 0.9 mm spring hard, Coffin spring 0.9 mm spring hard, labio-lingual bow 0.9 mm spring hard, anterior spring 0.8 mm spring hard
Function:
Treatment of protruded incisors
Description:
The appliance is a delicate functional appliance with a low acrylic share
The labial bow is bent contacting closely the upper incisors. On the height of the second premolars, the wire is bent backwards by 180° and passed between the canines and first premolars into the retention. The anterior springs lie on the most prominent parts of the incisors. The Coffin spring is bent closed distally.
While bending the lower labio-lingual bow the wire is positioned in the centre of the incisors. From there, it is bent towards occlusal and then in height of the first premolar is guided back to the canine. After this, it is bent by 180° back to the molar and from there arched into the upper jaw for retention.
In the lower jaw, the anterior spring is closed cervically and is anchored with its retention labially in the acrylic shield of the labio-lingual bow.
In the upper jaw the side wings, and in the lower jaw the labial shield are limited with wax.
The acrylic base of the finished appliance is very small and therefore it has to be polished carefully. The whole appliance should be preferably worked on with a manual motor and not with the lathe.
To reduce the force application the anterior springs are upholstered with plastic tubes.
