Stability and relapse of maxillary anterior crowding treatment in Class I and Class II Division 1 malocclusions
| Autor: | Marcos Roberto de Freitas, Karina Maria Salvatore de Freitas, Camila Leite Quaglio, José Fernando Castanha Henriques, Guilherme Janson |
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| Rok vydání: | 2011 |
| Předmět: |
Male
Cuspid Anterior tooth Adolescent Tooth Movement Techniques Linear displacement Cephalometry Dentistry Orthodontics Anterior crowding Malocclusion Angle Class I Malocclusion Angle Class II DENTES ANTERIORES Dental Arch Recurrence Oral and maxillofacial pathology Maxilla Orthodontic Anchorage Procedures medicine Premolar Extraoral Traction Appliances Humans Bicuspid Child Anterior teeth Retrospective Studies business.industry medicine.disease Serial Extraction Incisor Treatment Outcome medicine.anatomical_structure Female Malocclusion business Orthodontic Retainers After treatment Follow-Up Studies |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 0889-5406 |
| Popis: | Introduction The maxillary anterior teeth are the most important to facial esthetics because they are the first to show on a smile. Therefore, stability of the maxillary anterior teeth alignment is an important issue. The objective of this study was to compare the stability of maxillary anterior tooth alignment in Class I and Class II Division 1 malocclusions. Methods The sample comprised dental casts of 70 patients with Class I and Class II Division 1 malocclusions and a minimum of 3 mm of maxillary anterior crowding measured by an irregularity index. The patients were treated with extractions and evaluated at pretreatment and posttreatment and at least 5 years after treatment. The sample was divided into 3 groups: group 1, Class I malocclusion treated with 4 first premolar extractions comprising 30 subjects, with an initial age of 13.16 years and 8.59 mm of initial maxillary irregularity; group 2, Class II malocclusion treated with 4 first premolar extractions comprising 20 subjects, with an initial age of 12.95 years and 11.10 mm of maxillary irregularity; and group 3, Class II malocclusion treated with 2 first maxillary premolar extractions comprising 20 subjects, with an initial age of 13.09 years and 9.68 mm of maxillary irregularity. Results The decrease in the maxillary irregularity index was significantly greater in group 2 than in group 1 during treatment. The stability of maxillary anterior alignment was 88.12% over the long term; 77% of the linear displacement of the anatomic contact points tended to return to their original positions. Conclusions Stability of maxillary anterior alignment between the 3 groups was similar. The stability of maxillary anterior alignment was high over the long term, but a high percentage of teeth tended to return to their original positions. |
| Databáze: | OpenAIRE |
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