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.
Arch expansion is one of the most common ways to eliminate crowding and crossbites in growing patients. An expander is attached to the upper arch by bands placed around the teeth or plastic bonded over the teeth. Although there are removable expanders, fixed ones have an important advantage in that they cannot be lost or forgotten.
While there may be some initial discomfort when an expander is placed just because there has never been anything like that attached to the teeth before, for the most part upper arch expansion is relatively painless. Patients report that they feel pressure on the teeth, in the roof of the mouth, behind the nose, and even between the eyes as their expander is activated. This pressure fades within minutes.
Besides pressure, you can also expect your child to speak differently for the first few days. Additionally, you may hear them slurping as their mouth creates extra saliva after expander cementation. One of the most visible signs that the suture is opening (the desired effect) is the appearance of a space between the upper central incisors. The space is created as the expander pushes the two halves of the palate in opposite directions. Once you have stopped activating the expander, it is normal for the space to close spontaneously. This occurs as the elastic fibers in the surrounding gum tissues return to their original positions. The underlying bone, however, remains expanded. It is also normal for the front teeth to feel a little loose and get sore as they move back together.
To make the first couple of days more bearable for your child as they adapt to their new expander, you may want to find some fun foods for them to eat that don’t require a lot of chewing. Examples include yogurt, pudding, mashed potatoes, ice cream, etc. A day or two after their delivery appointment, the expander will feel natural in their mouth and normal eating will resume. While expanders are more forgiving of hard and sticky foods than are braces, it is recommended that patient avoid jelly like candies that would get stuck in the expansion screw.