Biodegradation of orthodontic metallic brackets and associated implications for friction

Regis, Saulo; Soares, Paulo; Camargo, Elisa Souza; Filho, Odilon Guariza; Tanaka, Orlando Motohiro; Mikami, Hiroshi

doi:10.1016/j.ajodo.2011.01.023

Cited by 29 publications

(59 citation statements)

References 32 publications

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“…Others 18,19 have reported increased amounts of RS depending on the exact storage environment or elastic material used. In a similar fashion to the elastic ligatures, the brackets themselves may become degraded 20 at different rates and stick to the archwire more than in the untreated state.…”

Section: Effect Of Mode Of Ligationmentioning

confidence: 99%

Effect of applied moment on resistance to sliding among esthetic self-ligating brackets

Pliska

Fuchs

Beyer

et al. 2013

The Angle Orthodontist

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Objective: To determine the effect of mode of ligation and bracket material on resistance to sliding (RS) by comparing various esthetic brackets of conventionally ligated and self-ligating (SL) designs under an increasing applied moment in the second-order dimension. Materials and Methods: Eight different commercially available esthetic brackets of SL and conventional elastomeric-ligated (CL) designs were mounted on a testing apparatus to simulate canine retraction using sliding mechanics and the application of a moment on 0. . The RS at calculated moments of 2000 g-mm and 4000 g-mm was determined and compared between the various brackets. Descriptive measures and one-way analysis of variance were used to calculate means and statistical differences among the bracket types. Results: The CL monocrystalline bracket displayed significantly greater (P , .05) RS than all other brackets tested. Among the other brackets, the range of RS values was 145.8-191.7 g and 291.9-389.2 g at moments of 2000 g-mm and 4000 g-mm, respectfully, though these differences were not significant (P , .05). All brackets tested displayed greater levels of RS (P , .05) at 4000 g-mm than at 2000 g-mm.Conclusion: With the exception of the CL monocrystalline bracket, all brackets displayed comparable amounts of RS regardless of mode of ligation or bracket slot material. (Angle Orthod. 2014;84:134-139.)

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Section: Effect Of Mode Of Ligationmentioning

confidence: 99%

Effect of applied moment on resistance to sliding among esthetic self-ligating brackets

Pliska

Fuchs

Beyer

et al. 2013

The Angle Orthodontist

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show abstract

“…Commercially available brackets of two different manufacturers presented up to 20% more friction than their out of the box correspondents. 15 Differently than the brackets, elastic ligatures showed similar levels of friction both brand new or after different times of intraoral use. 16 The physical and mechanical properties of orthodontic brackets deserve special attention when the effects of friction on OTM are considered.…”

Section: Variables That May Influence Friction During Otmmentioning

confidence: 99%

“…A recent evaluation of some important properties of brackets and elastic ligatures after their use brought some light to some of the questions related to the biodegradation of orthodontic materials. 15,16 The examination of metallic brackets post-orthodontic treatment revealed alterations such as corrosion, structural fatigue and plastic deformation. Different levels of biofilm were registered at the surface of these products and carbon, oxygen, calcium and phosphorus were found superficially.…”

Section: Variables That May Influence Friction During Otmmentioning

confidence: 99%

The role of friction in orthodontics

Pacheco

Jansen

Oliveira

2012

Dental Press J. Orthod.

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“…In addition to this, the variations of temperature and pH caused by diet, decomposition of foods, cell debris, oral micro flora, and their by-products are also important factors to be considered when evaluating the clinical behavior of orthodontic components that remain in the oral cavity for months or years. 2,3 It is considered 3 that the oral medium and time can influence the physical-chemical properties of stainless steel brackets and arch wires, which may act on the clinical performance of these materials and mean an increase in treatment time, as well as alter the color of tooth enamel and lead to caries. 4 Therefore, the focus of this in situ study was to test the hypothesis that treatment time, debris/biofilm, and oral pH had an influence on the physical-chemical properties of orthodontic brackets and arch wires.…”

Section: Introductionmentioning

confidence: 99%

“…The oral environment favors the biodegradation of metal alloys [1][2][3] due to its ionic, thermal, microbiological, and enzymatic conditions. In addition to this, the variations of temperature and pH caused by diet, decomposition of foods, cell debris, oral micro flora, and their by-products are also important factors to be considered when evaluating the clinical behavior of orthodontic components that remain in the oral cavity for months or years.…”

Section: Introductionmentioning

confidence: 99%

Effect of time and pH on physical-chemical properties of orthodontic brackets and wires

Santos

Pithon

Carlo

et al. 2015

The Angle Orthodontist

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Objective: To test the hypothesis that treatment time, debris/biofilm, and oral pH have an influence on the physical-chemical properties of orthodontic brackets and arch wires. Materials and Methods: One hundred twenty metal brackets were evaluated. They were divided into four groups (n 5 30) according to treatment time: group C (control) and groups T12, T24, and T36 (brackets recovered after 12, 24, and 36 months of treatment, respectively). Rectangular stainless-steel arch wires that remained in the oral cavity for 12 to 24 months were also analyzed. Dimensional stability, surface morphology, composition of brackets, resistance to sliding of the bracket-wire set, surface roughness of wires, and oral pH were analyzed. One-way analysis of variance, followed by a Tukey multiple comparisons test, was used for statistical analysis (P , .05).Results: Carbon and oxygen were shown to be elements that increased expressively and in direct proportion to time, and there was a progressive increase in the coefficient of friction and roughness of wires as a function of time of clinical use after 36 months. Oral pH showed a significant difference between group T36 and its control (P 5 .014). Conclusions: The hypothesis was partially accepted: treatment time and biofilm and debris accumulation in bracket slots were shown to have more influence on the degradation process and frictional force of these devices than did oral pH. (Angle Orthod. 2015;85:298-304.)

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Biodegradation of orthodontic metallic brackets and associated implications for friction

Cited by 29 publications

References 32 publications

Effect of applied moment on resistance to sliding among esthetic self-ligating brackets

Effect of applied moment on resistance to sliding among esthetic self-ligating brackets

The role of friction in orthodontics

Effect of time and pH on physical-chemical properties of orthodontic brackets and wires

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