Cephalometric and occlusal changes of Class III malocclusion treated with or without extractions

Autor(es)

Roberto Bombonatti ^[1] ; Arón Aliaga-Del Castillo ^[2] ; Juliana Fraga Soares Bombonatti ^[3] ; Daniela Garib ; Bryan Tompson ; Guilherme Janson ^[6]

Afiliação do(s) autor(es)

^[1] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Ortodontia - Brasil

^[2] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Ortodontia - Brasil

^[3] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Dentística, Endodontia e Materiais Odontológicos - Brasil

^[6] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Ortodontia - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Dental Press J. Orthod.; v. 25, n. 4, p. 24-32, 2020-09-21.

Resumo

ABSTRACT Objective: The aim of this retrospective study was to evaluate the cephalometric and occlusal changes of orthodontically treated Class III malocclusion patients. Methods: The experimental groups comprised 37 Class III patients treated: G1) without (n=19) and G2) with extractions (n=18) . The control group (G3), matched by age and sex with the experimental groups, consisted of 18 subjects with untreated Class III malocclusion. Cephalometric (radiographs) and occlusal (study models) changes were assessed between the beginning (T1) and the end (T2) of treatment. Intergroup comparisons were performed with one-way ANOVA followed by Kruskal-Wallis tests (p< 0.05). Occlusal changes were evaluated by the peer assessment rating (PAR) index (ANOVA and Kruskal-Wallis tests), and the treatment outcomes were evaluated by the Objective Grading System (OGS) (t-tests). Results: The experimental groups showed a restrictive effect on mandibular anterior displacement and a discrete improvement in the maxillomandibular relationship. Extraction treatment resulted in a greater retrusive movement of the incisors and significant improvements in the overjet and molar relationship in both groups. The PAR indexes were significantly reduced with treatment, and the OGS scores were 25.6 (G1) and 28.6 (G2), with no significant intergroup difference. Conclusions: Orthodontic treatment of Class III malocclusion patients with fixed appliances improved the sagittal relationships, with greater incisor retrusion in the extraction group. Both the extraction and non-extraction treatments significantly decreased the initial malocclusion severity, with adequate and similar occlusal outcomes of treatment. (AU)

• Processo FAPESP: 15/06177-5 - Alterações cefalométricas e oclusais de pacientes com má oclusão de classe III tratados com e sem extrações
• Beneficiário: Roberto Bombonatti
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado