Maxillary dentoskeletal outcomes of the expander with differential opening and the fan-type expander: a randomized controlled trial

Author(s)

Massaro, Camila ^[1] ; Garib, Daniela ^[2] ; Cevidanes, Lucia ^[3] ; Janson, Guilherme ^[1] ; Yatabe, Marilia ^[3] ; Pereira Lauris, Jose Roberto ^[4] ; Ruellas, Antonio Carlos ^{[3, 5]}

Affiliation

^[1] Univ Sao Paulo, Bauru Dent Sch, Dept Orthodont, Alameda Octavio Pinheiro Brisolla 9-75, BR-17012901 Bauru, SP - Brazil

^[2] Univ Sao Paulo, Bauru Dent Sch & Hosp Rehabil Craniofacial Anomal, Dept Orthodont, Alameda Octavio Pinheiro Brisolla 9-75, BR-17012901 Bauru, SP - Brazil

^[3] Univ Michigan, Sch Dent, Dept Orthodont & Pediat Dent, 1011 N Univ Ave, Ann Arbor, MI 48109 - USA

^[4] Univ Sao Paulo, Bauru Dent Sch, Dept Community Hlth, Alameda Octavio Pinheiro Brisolla 9-75, BR-17012901 Bauru, SP - Brazil

^[5] Univ Fed Rio de Janeiro, Sch Dent, Rio De Janeiro, RJ - Brazil

• Document type: Journal article
• Source: CLINICAL ORAL INVESTIGATIONS; v. 25, n. 9, p. 5247-5256, SEP 2021.
• Web of Science Citations: 1

Abstract

Objectives The aim of this study was to compare the maxillary dentoskeletal outcomes of the expander with differential opening (EDO) and the fan-type expander (FE). Material and methods Forty-eight patients with maxillary arch constriction in the mixed dentition were randomly allocated into EDO and FE groups. Cone-beam computed tomography scans were acquired before and after expansion. Linear and angular three-dimensional changes were assessed after cranial base superimposition using the ITK-SNAP and the 3D Slicer software. T or Mann-Whitney U tests were used for intergroup comparisons (P<0.05). Results The EDO group comprised 24 patients treated with the EDO (13 female, 11 male; 7.6 years). The FE group comprised 24 patients treated with the FE (14 female, 10 male; 7.8 years). Skeletal lateral displacements were greater in the EDO group with greater expansion in the orbital, nasal cavity, zygomatic bone, and palate regions (mean intergroup differences of 0.4, 0.8, 0.9, and 1.1 mm, respectively). Intercanine expansion and canine buccal inclination were greater in the FE group, while intermolar distance changes and molar buccal inclination were greater in the EDO group. Similar changes were observed for vertical and anteroposterior displacements and palatal plane rotation. Conclusions The EDO produced greater transverse skeletal expansion compared to the FE, with similar vertical and anteroposterior effects. Dental changes were greater in the molar region for patients treated with the EDO and in the canine region for patients treated with the FE. (AU)

• FAPESP's process: 17/12911-9 - Maxillary expander with differential opening versus fan-type expander: a randomized clinical trial
• Grantee: Camila da Silveira Massaro
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 17/24115-2 - Evaluation of innovative and conventional orthopedic maxillary expanders: a randomized clinical trial
• Grantee: Daniela Gamba Garib Carreira
• Support Opportunities: Regular Research Grants