Transverse discrepancy is not easily recognized by the patient and the orthodontic envelope of discrepancy is reportedly narrow in the transverse direction, which is why surgically assisted palatal expansion is recommended for the correction of maxillary transverse deficiencies in grown-up patients.Miniscrew-assisted RPE (MARPE) has been suggested as an alternative to the surgical intervention. In the meantime, latestclinical reports revealed the gender- and age- dependent successrate of the MARPE in adults. Also limited amount of expansion and skeletal relapse have been claimed.In this presentation, current status of the clinical outcome of the MARPE in postpubertal adults will be presented. Based on the suture biology, an expansion protocol to increase the success of the nonsurgical expansion will be demonstrated. Additionally, a gender- and age-specific treatment strategies will be proposed.Clinical cases indicating the use of MARPE for nonsurgical correction of Class III and asymmetry will be demonstrated.Troubleshooting in failure cases will also be explained. According to the theoretical background and clinical examples, nonsurgical approach for transverse correction can be justified under appropriate clinical manipulation to secure the quality and stability of occlusal outcomes.

•  Is the MARPE must for orthopedic expansion in adults? Canregular RPE split the suture?
•  If yes, then why bother to use MARPE, using additional mini-screws?
•  Again, why MARPE, not bone-borne RPE?
•  Is the bicortical miniscrew essential? Which one plays the major role?
•  How about the stability after MARPE?
•  What is the expansion protocol? ‘rapid for adult’ and ‘slowfor child’? Or the opposite?
•  RPE for children vs MARPE for adults? Or the opposite?