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

Author:

Bombonatti Roberto1ORCID,Aliaga-Del Castillo Arón1ORCID,Bombonatti Juliana Fraga Soares1ORCID,Garib Daniela2ORCID,Tompson Bryan3ORCID,Janson Guilherme1ORCID

Affiliation:

1. Universidade de São Paulo, Brazil

2. Universidade de São Paulo, Brazil; Hospital de Reabilitação de Anomalias Craniofaciais, Brazil

3. University of Toronto, Canada; Hospital for Sick Children, Canada

Abstract

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.

Publisher

FapUNIFESP (SciELO)

Subject

Oral Surgery,Orthodontics

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