Upper airway changes in Class III patients using miniscrew-anchored maxillary protraction with hybrid and hyrax expanders: a randomized controlled trial

Author(s)

Miranda, Felicia ^[1] ; Garib, Daniela ^{[1, 2]} ; Pugliese, Fernando ^[3] ; da Cunha Bastos, Jose Carlos ^[2] ; Janson, Guilherme ^[1] ; Palomo, Juan Martin ^[3]

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, Hosp Rehabil Craniofacial Anomalies, Silvio Marchione 3-20, BR-17012900 Bauru, SP - Brazil

^[3] Case Western Reserve Univ, Dept Orthodont, Sch Dent Med, 9601 Chester Ave, Cleveland, OH 44106 - USA

• Document type: Journal article
• Source: CLINICAL ORAL INVESTIGATIONS; MAY 2021.
• Web of Science Citations: 0

Abstract

Objectives The aim of this study was to compare the upper airway space changes after miniscrew-anchored maxillary protraction with hybrid (HH) and conventional hyrax (CH) expanders. Material and methods The sample comprised Class III malocclusion growing patients that were randomized into two groups of miniscrew-anchored maxillary protraction. The group HH was treated with a hybrid hyrax appliance in the maxilla and two miniscrews distally to the canines in the mandible. Class III elastics were used from the maxillary first molar to the mandibular miniscrews until anterior crossbite correction. The group CH was treated with a similar protocol except for the conventional hyrax expander in the maxilla. Cone-beam computed tomography was obtained before (T1) and after 12 months of therapy (T2). The shape and size of upper airway were assessed. Intergroup comparisons were performed using Mann-Whitney U test (p < 0.05). Results The group HH was composed of 20 patients (8 female, 12 male) with a mean age of 10.76 years. The group CH was composed of 15 patients (6 female, 9 male) with a mean age of 11.52 years. Anteroposterior and transverse increases of the upper airway were found for both groups. The oropharynx and the most constricted area increased similarly in both groups. Conclusions No differences in upper airway changes were observed using protraction anchored on hybrid or conventional hyrax expanders. (AU)

• FAPESP's process: 19/03175-2 - Airway evaluation after miniscrew anchored maxillary protraction: a randomized clinical trial
• Grantee: Felicia Miranda
• Support type: Scholarships abroad - Research Internship - 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 type: Regular Research Grants
• FAPESP's process: 17/04141-9 - Comparison of two skeletally anchored maxillary protraction protocols: a randomized clinical trial
• Grantee: Felicia Miranda
• Support type: Scholarships in Brazil - Doctorate