Hyrax Vs. Invisalign Palatal Expander Clinical Study

Inclusion Criteria: * Subject ages 6-11 years old * Subject must need maxillary expansion * Subjects must have erupted dentition in the area of the primary molars or permanent premolars and the first permanent molar Exclusion Criteria: * Subjects with palatal exostosis/surface aberration/ cleft palate * Subject's dentition not compatible with device or allergy to device materials * Subject with active caries, periodontal disease, TMD