| Influence of the quality of the finished occlusion on postretention occlusal relapse. | |
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MedLine Citation:
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PMID: 17920494 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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INTRODUCTION: In this study, we aimed to evaluate the influence of the quality of the finished occlusion on postretention occlusal stability. METHODS: The sample comprised 87 patients with Class I malocclusion, treated with extraction of the 4 first premolars and edgewise mechanics; they were divided into 2 groups, according to the quality of their finished occlusions. Group 1 included 44 subjects (23 boys, 21 girls) with posttreatment peer assessment rating (PAR) scores from 0 to 5. The mean pretreatment age was 13.74 years (SD 2.14). The mean treatment time was 1.92 years (SD 0.57), the mean retention time was 1.75 years (SD 0.96), and the mean time of posttreatment evaluation was 5.17 years (SD 1.82). Group 2 included 43 subjects (22 boys, 21 girls) with posttreatment PAR scores greater than 5. The mean initial age was 13.34 years (SD 1.35). The mean treatment time was 2.20 years (SD 0.66), the mean retention time was 1.77 years (SD 0.78), and the mean posttreatment evaluation was 5.47 years (SD 1.60). The PAR and the Little irregularity indexes were measured on the dental casts at pretreatment, posttreatment, and postretention. Intergroup comparisons were made with independent t tests, and the Pearson correlation coefficient was applied to the PAR score for the whole sample at the times evaluated. RESULTS: Well-finished patients had lower posttreatment and postretention PAR scores and greater changes during the treatment and posttreatment periods than did the poorly finished patients. For the Little irregularity index, the only difference between the groups was at the posttreatment stage; group 1 had a smaller irregularity score than group 2. The correlation coefficients showed that the greater the treatment changes, the smaller the posttreatment PAR score and the greater the relapse. But the higher the posttreatment PAR score, the higher the postretention PAR score. CONCLUSIONS: It was concluded that the greater the quality of the orthodontic finished occlusion, the greater are the treatment changes and the amount of relapse and the better is the occlusal status at the postretention stage in Class I malocclusion treated with 4 premolar extractions. |
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Authors:
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Karina Maria Salvatore de Freitas; Guilherme Janson; Marcos Roberto de Freitas; Arnaldo Pinzan; José Fernando Castanha Henriques; Célia Regina Maio Pinzan-Vercelino |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics Volume: 132 ISSN: 1097-6752 ISO Abbreviation: Am J Orthod Dentofacial Orthop Publication Date: 2007 Oct |
Date Detail:
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Created Date: 2007-10-08 Completed Date: 2007-10-22 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8610224 Medline TA: Am J Orthod Dentofacial Orthop Country: United States |
Other Details:
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Languages: eng Pagination: 428.e9-14 Citation Subset: D; IM |
Affiliation:
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Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil. kmsf@uol.com.br |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Female Humans Male Malocclusion, Angle Class I / therapy* Orthodontic Retainers Orthodontics, Corrective / instrumentation, methods, standards* Peer Review, Health Care* Prognosis Recurrence Retrospective Studies Statistics, Nonparametric Tooth Extraction Treatment Outcome |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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