University of the Pacific
The aim of this study is to evaluate the effectiveness of Invisalign Palatal Expander system ingrowing patients. This study compares the treatment outcomes of Invisalign Palatal Expander system to conventional treatments through randomized controlled trial.
Inclusion criteria: 1. Mixed dentition phase with at least three nonmobile (stable) teeth which have more than 1/4 of primary molar root length left16 in either side 2. Early permanent dentition stage and early permanent dentition but second permanent molars not yet fully erupted in the arch 3. Unilateral or bilateral posterior cross bite patients; or Patients who have been diagnosed with transverse maxillary deficiency (Skeletal transverse discrepancy measured from the estimated center of resistances of the first molars17 ≤ - 3 mm); 4. Patients with Class I or Class II skeletal relationship…
Invisalign palatal expander system: The Invisalign® Palatal Expander System (AlignTechnology, inc.) is 3D-printed orthodontic device for maxillary expansion.
Hyrax expander: The Hyrax-type maxillary expander will include a midline self-locking screw. The expansion screw is connected to the conventional molar bands or printed clasps, which are cemented on the maxillary first molars (or on the maxillary primary second molars), via 0.9 mm stainless-steel wire. The framework is soldered to the bands and extends on the palatal side to the primary canines or canines. The expander will be fabricated by a qualified laboratory technician
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