Advantages and limits of 3-segment (paramedian) versus 2-segment (median) surgically assisted rapid maxillary expansion (SARME)

Disadvantages of 2SO, such as median diastema, midline shift, median papilla infringement, asymmetric expansion, septum and columella dislocation, high forces on the periodontal apparatus, and subsequent attachment loss were overcome with 3SO. Bilateral double osteotomies appeared to promote higher volumes of callus formation, thus preventing relapses.