ABSTRACT Expansion has been one of the oldest means and also conservative method of gaining space and correcting the intermaxillary and dental arch relationships primarily in transverse direction. As clinicians we all rely on some form of rapid or slow palatal expansion appliances to produce maxillary change. Various appliances and treatment techniques have been developed and used to correct the transverse discrepancies. The most common is rapid maxillary expansion (RME) performed with a tooth-anchored expander. However the predictability of orthopedic expansion is greatly reduced after 15 years of age. Due to this reason, it has been proposed that the MARPE is an effective alternative to maximize the skeletal effects in adults and also to avoid invasive surgical procedures like SARPE .