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Maxillary expander with differential opening versus fan-type expander: a randomized clinical trial

Grant number: 17/12911-9
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): September 01, 2017
Effective date (End): December 31, 2020
Field of knowledge:Health Sciences - Dentistry - Orthodontics
Principal researcher:Daniela Gamba Garib Carreira
Grantee:Camila da Silveira Massaro
Home Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil
Associated scholarship(s):18/16153-4 - Maxillary expander with differential opening versus fan-type expander: a three-dimensional assessment, BE.EP.DR


Objective: The aim of this study is to compare the skeletal and dentoalveolar effects of the maxillary expander with differential opening and the fan-type expander in the mixed dentition. Material and Methods: A sample of 48 patients from 7 to 11 years old with transverse maxillary dental arch constriction will be randomly allocated into two study groups. The first group will consist of 24 individuals treated with the expander with differential opening (DEG). The second group will consist of 24 individuals treated with the fan-type expander (FEG). In 12 patients from each group (immediate subgroups), a cone-beam computed tomography (CBCT) will be performed in the beginning of treatment (T1) and immediately after the rapid maxillary expansion (T2). In the other 24 patients, 12 from DEG and 12 from FEG (late subgroups), a CBCT will be obtained at T1 and 6 months after maxillary expansion (T3). Dental models will be obtained for all patients at T1 and T3. In digital dental models, maxillary arch width, perimeter, length and shape will be measured. Standardized CBCT coronal sections will be used for measuring maxillary transverse dimensions, nasal cavity width and posterior tooth inclinations. The opening of the midpalatal suture at the anterior and posterior region and the geometry of the suture opening will be evaluated in axial reconstructions of the CBCT. The paired t test will be used in the intragroup comparison, and the independent t test will be used in the intergroup comparison. A significance level of 5% will be regarded for all tests.

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