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Comparison of root resorption between self-ligating and conventional preadjusted brackets using cone-beam computed tomography.
MedLine Citation:
PMID:  22409394     Owner:  NLM     Status:  Publisher    
Abstract Objective: To compare the magnitude of external apical root resorption (EARR) of incisors in patients undergoing the initial phase of orthodontic treatment with two sets of brackets. Materials and Methods: According to the results of the power analysis for sample size calculation, 19 Angle Class I patients (anterior crowding: 3 to 5 mm; mean age: 20.6 years) were included in the study and randomly divided into two groups: group I (n  =  11, self-ligating brackets) and group II (n  =  8, conventional preadjusted brackets). The degree of EARR was detected in 152 upper and lower incisors by using cone-beam computed tomography (CBCT) scans and a three-dimensional program (Dolphin 11.5, Dolphin Imaging & Management Solutions, Chatsworth, Calif) with 25% level of sensitivity. The CBCT scans were obtained before (T1) and 6 months after initiation of treatment (T2). Differences between and within groups were analyzed by nonpaired and paired t-test, respectively, with 5% significance level. Results: Significant differences were found for both groups between T1 and T2. However, no differences in the degree of EARR were detected between the groups studied. Conclusions: Although EARR has occurred in all teeth evaluated, the bracket design (self-ligating or conventional) did not demonstrate any influence on the results observed.
Vanessa Leite; Ana Claudia Conti; Ricardo Navarro; Marcio Almeida; Paula Oltramari-Navarro; Renato Almeida
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-12
Journal Detail:
Title:  The Angle orthodontist     Volume:  -     ISSN:  1945-7103     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-3-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370550     Medline TA:  Angle Orthod     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
a Graduate MS student, Department of Orthodontics, University of North Paraná, Londrina, Paraná, Brazil.
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