Hass-Type Expander with Marco Rosa Modification used in Primary and Early Mixed Dentition Advantages, Drawbacks and Encountered Clinical Problems
1. Introduction Maxillary constriction, usually manifested with the crowding of teeth or a cross-bite, is one of the most common orthodontic defects in the European population in the deciduous and the early mixed dentition periods [1]. This condition is an indication for early orthodontic treatment with the use of devices intended for RPE – rapid […]