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These appliances can be used to achieve expansion in the maxillary arch; there are devices for mandibular expansion or lower expansion too. In past many years, different types of appliances have been made. These types are: tissue-borne, tooth-borne, slow maxillary expansion, rapid maxillary expansion, and bone-anchored.
Rapid palatal expansion (RPE) or Rapid Maxillary Expansion (RME) is an expansion technique where expansion of 0.5 mm to 1 mm is achieved each day until the posterior crossbite is relieved. The expander works by turning a key inside the center of the expander. The turn of this key will push the arms of the expander.
SARPE is performed to address the transverse dimension changes in a patient. Sometimes this surgery is followed by Le Fort 1 in a second surgery to address the vertical and the anterior-posterior changes. Between the two surgeries, a patient's constricted maxillary arch is expanded with the rapid maxillary expander device placed in the maxilla.
Fan rapid palatal expander in cleft palate prior to alveolar cleft grafting In cleft lip and palate cases, the maxilla is typically narrow compared to the lower jaw and must be expanded outward. An expansion appliance is placed in the maxilla 6–9 months prior to correct any crossbite or upper arch constriction. [ 3 ]
The fact that it is a fixed appliance eliminates the patient compliance issues that accompany the Twin-block appliance. [8] O’Brien et al. (2003) found that treatment the Herbst appliance displayed a lower failure-to-complete treatment rate (12.9%) than Twin-block appliances (33.6%). [ 10 ]
In the 1950s, Wilhem Balters modified Andersen's Activator appliance and gave the new appliance the name Bionator Appliance, which was designed to produce forward positioning of the mandible. The Positioner Appliance was developed by Harold Kesling in 1944 in order to aid the orthodontic treatment during the finishing stage.
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