Rapid Palatal Expander

A palatal expander, also known as a rapid palatal expander, rapid maxillary expansion appliance, palate expander or orthodontic expander, is used to widen the upper jaw so that the bottom and upper teeth will fit together better. It is thought this can only be done when the patient is still growing, unless surgery is used to separate the two halves of the palate, however there is evidence to the contrary. It is most often followed by braces to straighten out all the teeth now that room has been created.

The expansion process usually results in a large gap between the patient's top front teeth, although this does not always happen. This gap is closed naturally and the teeth may overlap which leads to braces being needed. Sometimes with expanders, the patient has to turn the expansion screw themselves to tighten up the expander. For expansion that is not managed by the patient on the and lower jaw, a bionator may be a more suitable alternative.

Although it may vary from person to person, most usually feel slight pressure on their teeth. As the patient turns the expansion screw using the key, a space develops between the front two teeth. Some may notice a larger space while others do not notice a space at all. It usually takes several days to adjust to eating and speaking after first receiving the rapid palatal expander. Patients may experience pain and headaches while wearing palatal expanders and when the screw is turned. They may also feel a sore on their tongue from contact with the expander's metal bars.

Patients who have expanders may experience extra saliva and lisps (pronouncing the letter S as a T sound) or a slight 'hissing' S sound.

When the palatal expander is first removed, patients usually report that their mouth feels extremely big and spacious.