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A nance appliance is an orthodontic appliance that is cemented to the upper molar teeth. It extends to the palate and an acrylic button is modified to the fit of the patients palate (an impression is necessary in order for a lab technician to construct this appliance). This holds the molars in position so that the extraction space can be used to correct crowding (rather than the posterior teeth moving forwards and using up the extraction space).

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13y ago

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