الفهرس 
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Abstract
This study was conducted on ten patients ew aged between 10 : 12 years old and be suffer from Aaauajjaj of teeth of the second type the first section as a result of the lower jaw reflux with or without the progress of the upper jaw .
Lay Menen has never received any treatment calendar and has been installing a mobile and fixed a new career - called offer lower jaw was invented by Dr. Korn 1994 .
This device consists of two parts , one lower and one upper .
The bottom:
This part consists of a thick metal structure 100/4 of an inch and rises about 2 millimeters of Blindfolded mucous layer of the mandible and carries this basic structure and pillows to lower Aavadalhvh and one each in terms of bridle الشفي .
Are welded between the first and second premolar occlusal to express the distance to the linguistic layer .
This ends on the circuit structure of each hand about 2-3 millimeters of welded arm .
The upper part :
This part consists of two rings Malsouktin and one tooth grinding the first of every aspect of the upper jaw is installed on each episode circular tube on the cheek .
Tip of the penis is inserted the top of the device scuba As for the other side of the penis is circular in shape and can be attached to the device bottom.
An upper penis so that makes the device in the front position of the mandible without any abnormal pressure on the fiber or the lower gum .
The vocabulary was compared these cases before installing the device as well as then Isth months .
The study showed improvement and influential Hoz on the state of the lower jaw with the upper jaw to remain in place with the cessation of growth front.