Orthosmile - Expander

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Expansion appliances

An expander can be removable or fixed. Expansion is often used to widen the upper jaw and correct a cross-bite. A fixed expanders are glued in and can not be taken in and out by the patient. A fixed expander is attached to the upper back teeth and spans across the roof of the mouth. The expander (RME appliance) may have a screw device on the roof of the mouth that is activated (turned) by a family member with an expander key, as prescribed by Dr Yeo. For every activation or turn of the expander the upper jaw is expanded a quarter of a millimetre. Expansions of the upper jaw and teeth work best from ages 7 to 14 years old. In some cases we will decide to use a quad helix appliance, this appliance does not require any turning or adjustment. The appliance is pre-adjusted and then inserted into the mouth. The appliance will expand the jaw on its own until it reaches a pre-set width. On the other hand, removable expanders are just like fixed expanders, the only difference is removable expanders can be taken in and out of the mouth during treatment. Treatment time with a removable expander versus a fixed expander generally takes longer.

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