Orthodontic bracket slot dimensions as measured from entire bracket series

Brown, Paul A.; Wagner, Warren L.; Choi, Hyden

doi:10.2319/042814-307.1

Cited by 30 publications

(61 citation statements)

References 4 publications

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“…Brown et al measured the slot dimensions of 10 bracket series approximating five sets of brackets each and reported that about 30% of the brackets were narrower than expected, whereas 15% to 20% were at least 0.001 in. larger than the nominal value (Brown, Wagner, & Choi, ).…”

Section: Discussionmentioning

confidence: 98%

Variability of slot size in orthodontic brackets

Lefebvre

Saadaoui

Olivé

et al. 2019

Clinical & Exp Dental Res

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ObjectiveThe accuracy of the information incorporated into brackets is a determining factor for the efficacy of torque applied to teeth. The aim of this study was to compare the dimensions of a bracket's slots with the nominal values announced by the manufacturer.Materials and methodsA total of 730 maxillary right central brackets manufactured by seven companies (Dentsply Gac, American Orthodontics, Rocky Mountain Orthodontics, GC Orthodontics, 3M Unitek, and Dentaurum) were studied. The sample included 0.018 × 0.025 and 0.022 × 0.028 in., metal and ceramic, conventional and self‐ligating brackets. Images were obtained with an Olympus BX51 optical microscope. Slot dimensions were measured at the base and at the face on both mesial and distal sides using ImageJ software. Data were analyzed using Wilcoxon, sign tests, two‐ and three‐way ANOVA, and Tukey's tests. Intraclass correlation coefficient was employed to assess the intraobserver and interobserver variability. The threshold for statistical significance was p ≤ .05.ResultsStatistical analysis showed that the slot dimensions of 90% to 97% of studied brackets were significantly different from nominal values. In general, slot size was oversized, with a face size larger than the base size. Comparison between mesial and distal sides showed that up to 45% of the brackets were significantly asymmetrical. The manufacturer had a significant effect for base and face widths (p = .0001) and for length (p = .003).ConclusionThis study shows that a large proportion of measured brackets displays dimensional inaccuracies when compared with stated values. Clinically, the slot oversize and the divergence of slot walls cause an increase of wire‐slot play, inducing a loss of torque control. Practitioners cannot fully trust the precision of used appliances and should be aware that adjustments could be needed in the finishing stages of the treatment.

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Section: Discussionmentioning

confidence: 98%

Variability of slot size in orthodontic brackets

Lefebvre

Saadaoui

Olivé

et al. 2019

Clinical & Exp Dental Res

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“…Changes in the geometry of the bracket and slot can affect orthodontics, so, it is necessary to understand these changes for clinical knowledge (Brown et al, ; Joch et al, ). Moreover, the play between bracket slot and archwire can cancel small structural imperfections of the slot (Dalstra, Eriksen, Bergamini, & Melsen, ).…”

Section: Discussionmentioning

confidence: 99%

“…There is a wide variation of brackets prescriptions, some of them promise reducing wire bending and chair time, but orthodontists should be aware that the lack of accuracy of brackets slots can require additional bends at the end of treatment to achieve desired results (Brown, Wagner, & Choi, ; Joch, Pichelmayer, & Weiland, ). Considering that preset brackets are commonly used today, they are listed according to the chosen mechanics, which decreases the number of bends and the query time in orthodontics treatment, although questions remain as to the accuracy of these listings and whether there are imperfections in the slot (Alexander, ; Creekmore, ; McLaughlin & Bennett, ; Meling et al, ).…”

Section: Introductionmentioning

confidence: 99%

Precision brackets for upper lateral incisors in Bioprogressive therapy

Araujo

Guedes

Cunha

et al. 2019

Microscopy Res & Technique

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Orthodontic brackets, specifically in their slots, are responsible for receiving active orthodontic forces and transferring them to the teeth to be moved. The presence of an altered slot or inaccurate dimensions can influence the mechanical relationship between the bracket and archwire, interfering with the biomechanics of tooth movement. The objective of this study was by comparing the accuracy of slot placement of upper right lateral incisor metal brackets for Bioprogressive Ricketts therapy from five trademarks. The following characteristics were evaluated: height, torque, and internal parallelism of the walls of the slot. The sample included 75 brackets, 15 each from the following trademarks: 3M Abzil, Forestadent, Morelli Rocky Mountain Orthodontics, and Tecnident. Images of the slot profiles were obtained through standardized techniques using scanning electron microscopy, measured by the AutoCAD 2017 software, and compared to Ricketts prescription, respecting standard deviation with the technical and tolerance parameters present in standard ISO 27020. The results indicated that most of the evaluated characteristics were in accordance with the standard parameters, considering the tolerance adopted. There were exceptions found to this pattern of precision in the 3M Abzil brackets with regard to torque variation, and the Morelli brackets in relation to height variation and parallelism between the walls of the slot. Considering the measured dimensional characteristics, the metal brackets used in Bioprogressive Ricketts therapy has satisfactory pattern accuracy; however, there are still some specific inaccuracies in brackets from certain brands that can require more attention during the detailing phase. K E Y W O R D S brackets, parallelism, size, slot, torque

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“…Manufacturing anomalies may occur in a single bracket, throughout the sets of specific tooth brackets, or generally throughout an entire bracket series. 15 These manufacturing irregularities hamper efforts to evaluate how bracket slot size may affect the outcomes of orthodontic treatment.…”

Section: 11mentioning

confidence: 99%

The effect of bracket slot size on the effectiveness of orthodontic treatment: A systematic review

Vieira

Watanabe

Pontes

et al. 2017

The Angle Orthodontist

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Objectives: To assess, by means of a systematic review, the scientific evidence of the influence of 0.018-inch or 0.022-inch bracket slots on treatment time, efficiency of space closure, efficiency of alignment, quality of orthodontic finishing, level of discomfort, and level of root resorption. Materials and Methods: The PubMed, Bireme, Medline, Scopus, Web of Science, Open Grey, and Google Scholar databases were searched, with no date and language restrictions, for randomized clinical trials and controlled clinical trials, using controlled terms related to bracket slots. After the selection and removal of duplicate articles, the risk of bias was assessed, and the data from the included studies were extracted by two independent researchers. Results: The search yielded 2640 studies. After applying the eligibility criteria, eight articles were fully read and four studies were selected for the qualitative systematic review. No randomized clinical trials assessed the duration of treatment in patients treated with 0.018-inch and 0.022-inch bracket slots. Due to heterogeneity of the data available, a meta-analysis could not be conducted. Conclusions: While most studies indicated a shorter duration of treatment in patients with 0.018-inch bracket slots, no available data confirmed the higher efficiency of one system over the other. The biases in the studies did not allow for a reliable conclusion; therefore, new studies with a better methodologic design are needed. (Angle Orthod. 2018;88:100-106.)

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Orthodontic bracket slot dimensions as measured from entire bracket series

Cited by 30 publications

References 4 publications

Variability of slot size in orthodontic brackets

Variability of slot size in orthodontic brackets

Precision brackets for upper lateral incisors in Bioprogressive therapy

The effect of bracket slot size on the effectiveness of orthodontic treatment: A systematic review

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