The D-gainer appliance

This appliance is used instead of a palatal expander to eliminate crowding in the upper jaw and to allow for a wider smile.  Most of the time crowding in the lower jaw will self-correct spontaneously as the top is corrected.  This is substantiated in the orthodontic literature. ( Lima and Lima et al AJO, vol 126, num 5, pp 576-582 )

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