Vol. 9, Issue 4, Part A (2023)

Abstract: Diagnosis and treatment planning plays an important role in orthodontic treatment. Execution of treatment planning, proper appliance selection, accurate positioning of the appliance and following correct treatment protocol prevents the untoward effects during the treatment. Treatment of a unilateral posterior crossbite with facial symmetry is difficult with orthodontics alone. This article describes the untoward complication that occurred during the skeletal expansion using MARPE due to improper positioning of appliance for the correction of unilateral posterior crossbite and describes the guidelines for the placement of MARPE appliance as well as the anatomical variation consideration for the planning during placement.