Tandem skeletal expander and MAPA protocol for palatal expansion in adults

Transverse maxillary deficiency, which is frequently seen among adolescent and adult patients seeking orthodontic care, can cre- ate clinical, esthetic, and functional problems in both arches. The cause is multifactorial, attributable to both genetic and functional factors. The most common clinical finding is a unilateral or bilateral posterior crossbite.1,2 As many as 30% of adult patients may develop trans- verse maxillary deficiencies and posterior crossbites because their malocclusions have been left un- treated during growth.