The longitudinal study evaluated clinically and radiologically various appliances for upper jaw transverse expansion by using different treatment modalities and for lower jaw transverse expansion by using a MMDO (Mandibular Midline Distraction Osteogenesis) on 131 patients. The treatment showed stable results concerning the transverse dimension with relatively low morbidity. The expansion showed a symmetric expansion in the upper jaw and a v-shaped expansion for the lower jaw in the anterior-posterior direction. A tipping of the dentoalveolar segment was not observed.
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