Assessment of the dimensions and surface characteristics of orthodontic wires and bracket slots

Dolci, Gabriel Schmidt; Spohr, Ana Maria; Zimmer, Eduardo R.; Marchioro, Ernani Menezes

doi:10.1590/s2176-94512013000200016

Cited by 11 publications

(13 citation statements)

References 14 publications

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“…Previous studies evaluating the surface roughness of the stainless steel slot bracket base showed that there were variations in the surface roughness of the slot bracket base in several brands. 2,7 This study also showed a significant difference in the surface roughness of the slot bracket base between brand A and brand B, even though the two brands have an ISO certificate such as research by Agarwal et al 2 The surface roughness of stainless steel slot bracket base brand A was better than brand B. The ISO certified bracket group (bracket brand A and brand B) also have a significant difference compared to the non-ISO certified brackets (brand C and brand D), where the surface roughness of non-ISO certified stainless steel slot bracket was higher than the ISO-certified bracket, which means the surface roughness of ISO-certified stainless steel slot bracket base was better than the non-ISO-certified.…”

Section: Discussionmentioning

confidence: 99%

“…5 Other studies have shown that metal brackets show a high value of resistance to sliding compared to self-ligating brackets, although the relationship between the roughness of the bottom surface of the bracket slots and the resistance of sliding motion is still unclear. 6 The surface roughness of the bracket also influences the level of corrosion, as in the study of Dolci et al 7 , which states that surface homogeneity in orthodontic components is one of the factors to prevent corrosion. The underlying surface roughness of the varying bracket slots shows the difference in surface roughness standards owned by each of the brackets manufacturers.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the basic surface roughness of an ISO-certified and non-ISO-certified slot bracket with an atomic force microscope

et al. 2019

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Introduction:The base surface roughness of slot bracket can affect friction in tooth movement. There are ISO-certified and non-ISO-certified stainless steel brackets on the market. Thus orthodontists must be careful in choosing the right bracket. This study was aimed to evaluate the differences of the surface roughness of ISO-certified and non-ISO-certified Roth 0.022 inch stainless steel bracket with the parameter of S a (average roughness). Methods: This research was a laboratory observational. Samples were taken randomly as many as 32 brackets divided into two groups, each consisted of two bracket brands. Surface roughness measurements were performed using an atomic force microscope (AFM), then the data were analysed by ANOVA test (p < 0.05) and Post-Hoc analysis. Results: The ISO-certified bracket has an S a value smaller than the non-ISO-certified bracket. There was a significant difference in the surface roughness of the ISO-certified and non-ISO-certified slot bracket base (p < 0.05). Conclusion: The ISOcertified bracket has a smoother base surface than the non-ISO-certified bracket base.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of the basic surface roughness of an ISO-certified and non-ISO-certified slot bracket with an atomic force microscope

et al. 2019

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“…Torque is influenced by factors such as: anatomy of the buccal aspect of teeth, teeth size, bracket positioning, bracket size 7 , gap between the wire and the bracket slot 4,[8][9] , differences in direct bonding 10 , unusual crown shape and angulation 11 , application of strength outside the tooth center of resistance 6 , teeth with unusual morphology, and position of dental eruption 14 . The clinical responses for torque angle variations of brackets presented in this study should be interpreted carefully.…”

Section: Discussionmentioning

confidence: 99%

“…Straight-wire appliances correct dental positions if brackets are well placed by the orthodontist, and dental crowns present a typical morphology 6 . The expression of torque over teeth is influenced by factors such as: anatomy of the buccal aspect of the tooth, tooth size, bracket position, bracket size 7 , gap between the wire and the bracket slot [8][9] , differences in direct bonding 10 , unusual crown shape and angulation 11 , application of strength outside the tooth center of resistance 5 , dental arch shape and dental eruption position 12 .…”

Section: Introductionmentioning

confidence: 99%

Assessment of torque angle of brackets from different brands

Anjos¹,

Pompeo²,

Anjos³

et al. 2015

Braz. J. Oral Sci.

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Aim: To measure torque angle values of brackets designed for canines, comparing it to their prescription values. Methods: One hundred and sixty maxillary (-2 o) and mandibular (-11 o) canine brackets of Roth prescription from the following brands were selected: Abzil, Eurodonto, Morelli and Ormco. The brackets were set in wax and images were obtained by scanning. Reference points were determined over these images, lines drawn and the torque angle was measured. The Student's t-test and the Wilcoxon signed-rank test were used at a significance level of 5%. Results: For maxillary canine brackets, the medium torque angle values were: Abzil-0.93 o (± 0.88 o); Eurodonto 0.13 o (± 0.34 o); Morelli-2.56 o (± 0.50 o), and Ormco-1.16 o (± 1.27 o). For mandibular canine brackets, the values were: Abzil-11.76 o (± 0.40 o); Eurodonto-10.40 o (± 0.25 o); Morelli-11.18 o (± 0.56 o), and Ormco-11.36 o (± 0.30 o). For maxillary canine brackets, the brands Abzil, Morelli, and Ormco presented statistically diferente values from those indicated for prescription. For mandibular canine brackets, the brands Abzil, Eurodonto, and Ormco presented statistically different values from the prescribed ones. Conclusions: Some marketed brands present differences between the torque angle found in the brackets and those recommended in the prescription. However, these differences are clinically acceptable.

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“…However, these parameters may change during the manufacturing and finishing process, which may lead to modifications of the bracket's features, such as an increase or decrease in the slot height, as well as a loss of parallelism of the inner walls, resulting in converging or diverging of them. When these changes are present, fitting is not correct and the expected relationship between the wire and the bracket changes, thereby decreasing the efficiency of any type of mechanical treatment (Dolci, Spohr, Zimmer, & Marchioro, ; Radhakrishnan, Sapna Varma, & Ajith, ). Another change that may occur is related to the angle of torque, which can be increased or decreased since the bracket is intended to precisely fit on the buccal or lingual inclination of each dental element, thereby making it difficult to control some mechanical parameters (Dolci et al, ; Radhakrishnan 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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Assessment of the dimensions and surface characteristics of orthodontic wires and bracket slots

Cited by 11 publications

References 14 publications

Evaluation of the basic surface roughness of an ISO-certified and non-ISO-certified slot bracket with an atomic force microscope

Evaluation of the basic surface roughness of an ISO-certified and non-ISO-certified slot bracket with an atomic force microscope

Assessment of torque angle of brackets from different brands

Precision brackets for upper lateral incisors in Bioprogressive therapy

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