Evaluation of stiffness and plastic deformation of active ceramic self-ligating bracket clips after repetitive opening and closure movements

Carneiro, Grace Kelly Martins; Roque, Juliano Alves; Garcez, Aguinaldo Silva; Suzuki, Hideo

doi:10.1590/2176-9451.20.4.045-050.oar

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…The questions raised in our study reinforced the affirmations of other authors that the supposed advantage of lower friction in self-ligating brackets was still controversial, when compared with conventional brackets associated with archwires with rectangular sections, particularly when comparisons were made between active self-ligating brackets and the conventional types 4,11,14,16,26,27 .…”

Section: Discussionsupporting

confidence: 78%

Evaluation of friction on self-ligating and conventional brackets associated with different types of archwires submitted to sliding mechanics

Barbosa¹,

Correr²,

Carneiro³

et al. 2019

Braz. J. Oral Sci.

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Aim: The aim of this study was to verify the frictional force during sliding mechanics in orthodontic tooth movement, using conventional metal brackets of the active and passive self-ligating types with stainless steel and copper nickel titanium archwires. Methods: This experimental in vitro study was conducted with conventional metal (Morelli, Sorocaba, SP, Brazil) brackets, active self-ligated (SLI Morelli, Sorocaba, SP, Brazil) and passive self-ligated (SLP Morelli, Sorocaba, SP, Brazil), with slot 0.022 x 0.028 inches and Roth prescription. The brackets were tested with rectangular section 0.019 x 0.025 inch copper nickel titanium and stainless steel archwires. For each type of bracket, 10 sets of plate/bracket/archwire segment (n=10) were fabricated. Non-parametric Kruskal Wallis and Dunn tests were used for comparison between types of brackets and Wilcoxon tests for comparison between types of archwires. Results: The results showed that the frictional force values were higher with copper nickel titanium than with stainless steel archwires (p<0.05). When copper nickel titanium archwires were used, the active self-ligating brackets showed higher frictional force values than the other types, followed by the conventional brackets. Lower frictional force values were observed with passive self-ligating brackets. For stainless steel archwires, no difference was observed between conventional and active self-ligating brackets, the passive self-ligating type presented lower frictional force values than the others. Conclusion: It was concluded that the higher frictional force was observed when active self-ligating brackets were associated with copper nickel titanium archwires. Lower frictional force was verified between passive self-ligating brackets combined with stainless steel archwires.

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Section: Discussionsupporting

confidence: 78%

Evaluation of friction on self-ligating and conventional brackets associated with different types of archwires submitted to sliding mechanics

Barbosa¹,

Correr²,

Carneiro³

et al. 2019

Braz. J. Oral Sci.

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“…Self-ligating brackets were first introduced in the 1930s and several types of these brackets have become commercially available in the past 20 years 1. Self-ligating brackets can be classified into two groups according to their closing mechanism: passive clips and interactive clips 2…”

Section: Introductionmentioning

confidence: 99%

Surface analysis of metal clips of ceramic self-ligating brackets

et al. 2019

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ObjectiveThe aim of this study was to analyze the surface composition, roughness, and relative friction of metal clips from various ceramic self-ligating brackets.MethodsSix kinds of brackets were examined. The control group (mC) consisted of interactive metal self-ligating brackets while the experimental group (CC, EC, MA, QK, and WA) consisted of interactive ceramic self-ligating brackets. Atomic force microscopy-lateral force microscopy and scanning electron microscopy-energy-dispersive X-ray spectroscopy were used to analyze the surface of each bracket clip.ResultsAll the clips in the experimental groups were coated with rhodium except for the QK clip. The results showed that the QK clip had the lowest average roughness on the outer surface, followed by the MA, EC, WA, and CC clips. However, the CC clip had the lowest average roughness on the inner surface, followed by the QK, WA, MA, and EC clips. The QK clip also had the lowest relative friction on the outer surface, followed by the MA, EC, CC, and WA clips. Likewise, the CC clip had the lowest relative friction on the inner surface, followed by the QK, WA, MA, and EC clips.ConclusionsThe surface roughness and relative friction of the rhodium-coated clips were generally higher than those of the uncoated clips.

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“…Clinicians may use pins, stainless steel ligature; self ligating clips and circular elastomers to ligate orthodontic archwires to the brackets. 1 , 2 Elastomeric ligatures are most commonly used by clinicians due to their several advantages including low cost, easy application, reduced chair time, patient comfort and satisfaction. 3 …”

Section: Introductionmentioning

confidence: 99%

Discoloration and force degradation of orthodontic elastomeric ligatures

Nakhaei

Agahi

Rezaeizadeh

2017

Dental Press J. Orthod.

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OBJECTIVE: The aim of the present study was to evaluate color changes and force degradation of orthodontic elastomeric ligatures in different stretching patterns during a 8-weeks period. METHODS: Two elastomers with the minimum and two with the maximum color changing, and gray elastomers of two brands (American Orthodontics and Ortho Technology) were selected according to an opinion poll with clinicians and color changes after 4 weeks of intraoral use were evaluated. These elastomers were mounted on special jigs fabricated using a CAD-CAM technique, underwent different stretching patterns and the force was measured in 0, 24 hours, 2, 4 and 8 weeks. During in vivo part of the study, force levels of elastomers were measured after 4 weeks on a material testing machine. Data were analyzed with four-way ANOVA and Tukey post hoc tests.RESULTS: All the elastomers showed color changing but the degree of color stability was significantly different. The mean force degradation was higher in 1-mm stretch groups. After 8 weeks, the average residual force of elastomers was 1.45 ± 0.18 N and the maximum force decay was seen in the elastomers that exhibited the maximum initial force.CONCLUSION: There is significant relationship between the stretching pattern and the amount of residual force of elastomers. Elastomers with higher initial forces exhibited higher percentages of force loss after 8 weeks. It seems that there is a relationship between initial color and color changing of elastomers.

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Evaluation of stiffness and plastic deformation of active ceramic self-ligating bracket clips after repetitive opening and closure movements

Cited by 4 publications

References 16 publications

Evaluation of friction on self-ligating and conventional brackets associated with different types of archwires submitted to sliding mechanics

Evaluation of friction on self-ligating and conventional brackets associated with different types of archwires submitted to sliding mechanics

Surface analysis of metal clips of ceramic self-ligating brackets

Discoloration and force degradation of orthodontic elastomeric ligatures

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