Stabilizing the occlusion achieved by means of orthodontic therapy is one of the main treatment goals.
Occlusion instability can be divided into two categories: 1. Changes related to growth, maturation and ageing of dentition and occlusion. 2. Changes produced by the orthodontic treatment. Contact and pressure by soft tissues can be another factor influencing stability.
The ability to achieve long-term stability and the subsequent understanding of factors affecting stability are an indication for the need to retain the achieved results.
In the absence of a retention phase, teeth tend to return to their initial position. To prevent recurrence, it is necessary to perform some form of retention.
► See also: ORTHODONTIC : How to Apply Dental Wax on Braces
Many retention devices are currently used to keep the shape of the arch and to prevent recurrence.
Designed in 1919, the Hawley plate is the most popular removable retainer. In 1993, Sheridan et al introduced the Essix plates as a modern, aesthetic, comfortable, and inexpensive alternative to traditional retainers.
Currently, both the Hawley plate and the Essix® plate are the most widely used removable retainers.
They have a disadvantage though: they need cooperation by the patient.
Fuente : Revista Facultad de Odontología Universidad de Antioquia
Authors : ISAAC WASSERMAN / KARINA FERRER / JESÚS GUALDRÓN / NANCY JIMÉNEZ / LAURA MATEOS