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 DEFINITION
It is a device that is placed in the children principally, with the target to prevent the teeth from moving ahead occupying the space of the tooth or lost teeth. These devices have to: to support the space during the sufficient time up to the eruption of the permanent tooth, not to interfere with the process of dental change, to prevent the extrusion of the antagonists, to allow the eruption of the permanent tooth and to restore the function and the esthetics. It is named I fix why once placed it cannot be withdrawn by the patient.
SYMPTOMS
There takes place the premature loss of a tooth or temporary teeth or it is necessary to realize his extraction. The fixed presidents are indicated especially in the loss of molars and when absence only one should teethe, as maximum, for quadrant. Likewise they are indicated in patients in whom few collaboration is suspected and in the cases that allow the laying of a band or crown in the support teeth.
SKILL
There exist different types of fixed presidents of space: band - handle, crown - handle, lingual arch, transpalatina bar and button of resin, and subgingival. Each of the types has his indications and limitations. In all the cases there is precise the captures of impressions and the achievement of the president, so that later he is exact and cemented in the mouth of the child.
COMPLICATIONS
Every carrying child of a president of space must be controlled periodically to avoid imbalances and power to realize the pertinent adaptations to the physiological changes that happen until now of his retreat. It is necessary to watch and foresee the moment of his retreat.
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DEFINITION 
