Comparison of dentoalveolar, skeletal and soft tissue changes of the treatment of Class II malocclusion with three different intraoral distalization systems: Jones jig, Distal jet and First Class

• Autor(a) principal: Souza, Lorena Vilanova Freitas de
• Data de Publicação: 2017
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Biblioteca Digital de Teses e Dissertações da USP
• Texto Completo: https://www.teses.usp.br/teses/disponiveis/25/25144/tde-25102021-182309/
• topic: Angle Class II Malocclusion; Cefalometria; Cephalometry; Má oclusão de Angle Classe II; Orthodontics; Ortodontia

Introduction: This study aimed to cephalometrically compare the dentolalveolar, skeletal and soft tissue changes caused by Jones jig, Distal jet and First Class appliances. Methods: The sample included 71 patients divided into three groups. G1 (n=30; 16 male, 14 female, with a mean age of 13.17 years) was treated with Jones jig for 0.8 years. G2 (n=25; 8 male, 17 female, with a mean age of 12.57 years) was treated with Distal jet for 1.06 years. G3 (n=16; 6 male, 10 female, with a mean age of 12.84 years) was treated with First Class for 0.69 years. Intergroup treatment changes comparisons were performed using one-way ANOVA followed by Tukey tests. Results: Intergroup comparisons showed significantly greater maxillary premolar mesial angulation and first molar distal angulation in G1. The maxillary first molars presented smaller distal angulation in G2. G3 presented significantly smaller first premolar mesialization compared to G1 and smaller incisor protrusion and less overjet change compared to G2. Treatment time was significantly smaller in G3. Conclusion: All appliances corrected the Class II molar relationship. The Distal jet group produced smaller distal angulation. First Class appliance seems to produce less anchorage loss and shorter treatment time.