Long-term stability of anterior open bite extraction treatment in the permanent dentition. |
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| Authors: | Marcos Roberto de Freitas Rejane Targino Soares Beltr?o Guilherme Janson José Fernando Castanha Henriques Rodrigo Hermont Can?ado |
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| Institution: | 1. Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paolo, Brazil;2. Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paolo, Brazil;3. Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paolo, Brazil;1. Department of Pediatric Dentistry, Faculty of Dentistry, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil;2. Department of Dentistry, State University of Paraíba, Campina Grande, Brazil;3. Orthodontic Unit, Adelaide Dental School, The University of Adelaide, Adelaide, South Australia, Australia;4. Department of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada;1. Assistant professor, Division of Orthodontics, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan;2. Oral surgeon, Yukiguni Yamato Hospital, Minamiuonuma City, Niigata, Japan;3. Professor and chair, Division of Orthodontics, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan;1. Department of Orthodontics, State University of Rio Grande do Norte, Caicó, Rio Grande do Norte, Brazil;2. Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil;3. Department of Orthodontics, University Severino Sombra, Vassouras, Rio de Janeiro, Brazil; Multidisciplinary Dental Institute, Rio de Janeiro, Rio de Janeiro, Brazil;4. Department of Prosthodontics, Bauru Dental School; Hospital of Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru, São Paulo, Brazil;5. Department of Orthodontics, Bauru Dental School; Hospital of Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru, São Paulo, Brazil |
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| Abstract: | The purpose of this study was to cephalometrically evaluate the long-term stability of anterior open bite extraction treatment in the permanent dentition after a mean period of 8.35 years. Cephalometric headfilms were obtained at pretreatment, posttreatment, and postretention stages from 31 patients who had undergone orthodontic treatment with fixed appliances. Two control groups were used. The first, with an age similar to that of the experimental group before treatment, was used only to characterize it. The second, with normal occlusion, was followed longitudinally for a period comparable with the posttreatment period and was used to compare changes during this period. The differences between the observation stages in the experimental group were analyzed with paired t tests, and the posttreatment changes were compared with the changes of the second control group with independent t tests. There was no statistically significant decrease of the obtained anterior overbite at the end of the posttreatment period. The primary factors that contributed to the nonsignificant decrease of the overbite were the normal vertical development of the maxillary and mandibular incisors, the smaller vertical development of the mandibular molars, and the consequent smaller increase in lower anterior face height, as compared with the control group in the long-term posttreatment period. Additionally, 74.2% of the sample had a "clinically stable" open bite correction. |
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