Maxillary expander with differential opening versus fan-type expander: a three-dimensional assessment

• Grant number: 18/16153-4
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Start date: January 30, 2019
• End date: December 29, 2019
• Field of knowledge: Health Sciences - Dentistry - Orthodontics
• Principal Investigator: Daniela Gamba Garib Carreira
• Grantee: Camila da Silveira Massaro
• Supervisor: Lucia Helena Cevidanes
• Host Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil
• Institution abroad: University of Michigan, United States
• Associated to the scholarship: 17/12911-9 - Maxillary expander with differential opening versus fan-type expander: a randomized clinical trial, BP.DR

Abstract

Introduction: The treatment of choice for maxillary constriction is the Rapid Maxillary Expansion (RME). However, there are no three-dimensional studies describing the effects of RME in the midpalatal suture and in the craniofacial complex. Purpose: To three-dimensionally assess 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 24 patients from 7 to 10 years old with transverse maxillary dental arch constriction was randomly allocated into two study groups: 12 individuals treated with the expander with differential opening (DEG) and 12 individuals treated with the fan-type expander (FEG). Cone-beam computed tomography (CBCT) exams were performed in the beginning of the treatment (T1) and 6 months after maxillary expansion (T2). Using the software ITK-SNAP and 3D-SLICER, segmentation and superimposition of T1 and T2 images at the cranial base will be performed. The three-dimensional displacement (X, Y and Z coordinates) of the maxilla, teeth, zygomatic bone and circum-maxillary sutures will be measured. Descriptive statistics will be used to describe the sample means, standard deviations and ranges. Intergroup comparisons will be performed using independent t tests. The intrarater reliability will be assessed using intraclass correlation coefficients and the Bland-Altman method. The significance level considered will be 5%.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

MASSARO, CAMILA; LOSADA, CAROLINA; CEVIDANES, LUCIA; YATABE, MARILIA; GARIB, DANIELA; PEREIRA LAURIS, JOSE ROBERTO; IOSHIDA, MARCOS; REY, DIEGO; ANTONIA ALVAREZ, MARIA; BENAVIDES, ERIKA; et al. Comparison of linear and angular changes assessed in digital dental models and cone-beam computed tomography. ORTHODONTICS & CRANIOFACIAL RESEARCH, v. 23, n. 1, NOV 2019. (18/16153-4)