This study will assess the dentoskeletal effects of two types of maxillary expanders in orthodontic patients in the mixed dentition, from 7 to 11 years old. Half of participants will be treated using the expander with differential opening, while the other half will undergo rapid maxillary expansion using the fan-type expander. The null hypothesis is that there is no difference between dentoskeletal effects of the two protocols.
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Maxillary and mandibular arch width (mm)
Timeframe: 6 months
Maxillary and mandibular arch length
Timeframe: 6 months
Maxillary and mandibular arch perimeter (mm)
Timeframe: 6 months
Nasal cavity width (mm)
Timeframe: 6 months
Maxillary width (mm)
Timeframe: 6 months
Maxillary molars inclination (°)
Timeframe: 6 months
Maxillary deciduous canines inclination (°)
Timeframe: 6 months
Amount of interincisor diastema (mm)
Timeframe: 10 days
Opening of the midpalatal suture (mm)
Timeframe: 10 days