Torque expression capacity of 0.018 and 0.022 bracket slots by changing archwire material and cross section

Arreghini, Angela; Lombardo, Luca; Mollica, Francesco; Siciliani, Gíuseppe

doi:10.1186/s40510-014-0053-x

Cited by 60 publications

(70 citation statements)

References 18 publications

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“…Reversing the formula, considering the slot height as a constant (0.0220 for rectangular archwires and 0.0180 for square archwires) and inserting the real bevel radius, the resulting calculation yields the play. As expected from the literature, 4 this calculation revealed that in the real world the play is invariably greater than the ideal, within the range +34% to +313%. Translated into degrees, the increase in play seen in our sample ranged from +1u (Ormco 0.021 3 0.0250 NiTi heat activated) to +17u (Ormco 0.017 3 0.0220 SS) with respect to the ideal.…”

Section: Discussionsupporting

confidence: 60%

“…3,4,[7][8][9] This is confirmed by our measurements, although we found that the stated measurements were more precise than those reported by other authors, with a tolerance range of 26.47% to +5.10%, as opposed to the 17% reported elsewhere. 6 The role of the archwire edge bevel has not yet been studied in depth.…”

Section: Discussioncontrasting

confidence: 51%

“…In fact, real bracket slots have been shown to be consistently larger than their stated dimensions, although the extent to which values differ naturally vary widely among samples. Electronic microscopy has shown that both lingual and labial bracket slot heights are between +0.56 and +11.16% greater than those declared, 4 and Demling et al, 5 using a pin gauge to measure the slot height in three lingual systems, found that they were oversized by up to 2.2%. In a selection of labial brackets, Cash et al 6 also found that slots were 6% to 17% larger than claimed.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, other authors have highlighted cases of undersized and oversized archwires, stating, however, that the discrepancy seldom exceeded 0.0005 inch with respect to the ideal. 3,4,8,9 It is unclear, therefore, what, if any, role the dimensional imprecision of archwires may play in increasing the archwire-slot play.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Comparative analysis of real and ideal wire-slot play in square and rectangular archwires

Lombardo

Arreghini

Bratti

et al. 2014

The Angle Orthodontist

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Objective: To evaluate the degree to which the height, width, and cross-section of rectangular and square orthodontic archwires affect the play between the archwires and the bracket slot. Materials and Methods: The stated measurements (height and width) of 43 archwires from six different manufacturers were compared with real values obtained using a digital gauge. The curvature (radius) of the edge bevels was also measured to calculate the play within the slot, and this measurement was compared with the ideal value. Results: The real height and width of the archwires differed from those stated by the manufacturers, falling within the range 26.47% and +5.10%. The curvature of each bevel on each archwire cross-section was shown to differ, and consequently increased the real play between the archwire and slot with respect to the ideal to different degrees. Conclusions: The archwire-slot play was greater than the ideal for each archwire considered, inevitably leading to a loss of information within the system. (Angle Orthod. 2015;85:848-858.)

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Section: Discussionsupporting

confidence: 60%

Section: Discussioncontrasting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparative analysis of real and ideal wire-slot play in square and rectangular archwires

Lombardo

Arreghini

Bratti

et al. 2014

The Angle Orthodontist

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, Confidence brackets exhibited significant differences in the manufacturing errors of torque. [19] Another study showed that even with the use of a similar wire, the brackets of different companies exhibited different play and torque functions, and in all the brackets evaluated, the dimensions of the slot were larger than those reported by the manufacturers,[22] which was similar to the results reported by Cash et al . [15]…”

Section: Discussionsupporting

confidence: 74%

Assessment of dimensional accuracy of preadjusted metal injection molding orthodontic brackets

Alavi

Tajmirriahi²

2016

Dent Res J

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Background:the aim of this study is to evaluate the dimensional accuracy of McLaughlin, Bennett, and Trevisi (MBT) brackets manufactured by two different companies (American Orthodontics and Ortho Organizers) and determine variations in incorporation of values in relation to tip and torque in these products.Materials and Methods:In the present analytical/descriptive study, 64 maxillary right central brackets manufactured by two companies (American Orthodontics and Ortho Organizers) were selected randomly and evaluated for the accuracy of the values in relation to torque and angulation presented by the manufacturers. They were placed in a video measuring machine using special revolvers under them and were positioned in a manner so that the light beams would be directed on the floor of the slot without the slot walls being seen. Then, the software program of the same machine was used to determine the values of each bracket type. The means of measurements were determined for each sample and were analyzed with independent t-test and one-sample t-test.Results:Based on the confidence interval, it can be concluded that at 95% probability, the means of tip angles of maxillary right central brackets of these two brands were 4.1–4.3° and the torque angles were 16.39–16.72°. The tips in these samples were at a range of 3.33–4.98°, and the torque was at a range of 15.22–18.48°.Conclusion:In the present study, there were no significant differences in the angulation incorporated into the brackets from the two companies; however, they were significantly different from the tiP values for the MBT prescription. In relation to torque, there was a significant difference between the American Orthodontic brackets exhibited significant differences with the reported 17°, too.

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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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Torque expression capacity of 0.018 and 0.022 bracket slots by changing archwire material and cross section

Cited by 60 publications

References 18 publications

Comparative analysis of real and ideal wire-slot play in square and rectangular archwires

Comparative analysis of real and ideal wire-slot play in square and rectangular archwires

Assessment of dimensional accuracy of preadjusted metal injection molding orthodontic brackets

Variability of slot size in orthodontic brackets

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