American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics
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Am J Orthod Dentofacial Orthop · Jun 2010
Comparative StudyNickel release from new conventional stainless steel, recycled, and nickel-free orthodontic brackets: An in vitro study.
The aim of this study was to compare the nickel released from 3 kinds of orthodontic brackets: new conventional stainless steel, recycled stainless steel, and nickel-free brackets. ⋯ Reconditioned brackets released the most nickel. Moreover, the highest nickel release was recorded in the 2 experiments performed at pH 4.2; it was lower at pH 6.5 and 7.6. Conversely, no relevant differences were observed overall between the maxillary and mandibular arches.
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Am J Orthod Dentofacial Orthop · Apr 2010
Modifications of midpalatal sutural density induced by rapid maxillary expansion: A low-dose computed-tomography evaluation.
The aim of this study was to evaluate the density of the midpalatal suture as assessed by low-dose computed tomography (CT) before rapid maxillary expansion (RME) (T0), at the end of active expansion (T1), and after a retention period of 6 months (T2). ⋯ The effective opening of the midpalatal suture by RME in prepubertal subjects was associated with a significant decrease in sutural density. The sutural density after 6 months of retention post-RME indicated reorganization of the midpalatal suture, since it showed values similar to the pretreatment ones.
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Am J Orthod Dentofacial Orthop · Nov 2009
Randomized Controlled Trial Comparative StudyLow-level laser therapy for pain caused by placement of the first orthodontic archwire: a randomized clinical trial.
The purpose of this study was to clinically evaluate the effect of low-level laser therapy (LLLT) as a method of reducing pain reported by patients after placement of their first orthodontic archwires. ⋯ Based on these findings, we concluded that LLLT efficiently controls pain caused by the first archwire.
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Am J Orthod Dentofacial Orthop · Nov 2009
Are studies reporting significant results more likely to be published?
Our objective was to assess the hypothesis that there are variations of the proportion of articles reporting a significant effect, with a higher percentage of those articles published in journals with impact factors. ⋯ Journals seem to prefer reporting significant results; this might be because of authors' perceptions of the importance of their findings and editors' and reviewers' preferences for significant results. The implication of this factor in the reliability of systematic reviews is discussed.