Fluoride influences nickel-titanium orthodontic wires′ surface texture and friction resistance

Abbassy, Mona Aly

doi:10.4103/2278-0203.192114

Cited by 24 publications

(20 citation statements)

References 29 publications

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“…It was shown that the in vitro fluoride application caused an increase in friction resistance of Ni-Ti wires when compared to stainless steel wires. In vitro and in situ fluoride application caused deterioration in surface properties of Ni-Ti wires 54 . Some studies have investigated the differences between various types of brackets in terms of adhesion of cariogenic streptococci.…”

Section: Discussionmentioning

confidence: 99%

Impact of self-assembling peptides in remineralisation of artificial early enamel lesions adjacent to orthodontic brackets

Jablonski-Momeni

Nothelfer

Morawietz

et al. 2020

Sci Rep

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Enamel demineralisation can occur as a side effect during orthodontic treatment with fixed appliances. This study aimed to evaluate the efficacy of the self-assembling peptide P11-4 for remineralisation combined with fluorides, compared to application of fluoride varnish alone. De- and remineralisation was assessed by Quantitative light-induced fluorescence (QLF). Orthodontic brackets were bonded on 108 human enamel samples and white spot lesions were created. The samples were allocated randomly into three groups: Group I received no treatment, group II had a single application of fluoride varnish (22,600 ppm), and group III was treated with P11-4 following a single application of fluoride varnish. Quantitative light-induced fluorescence (QLF) measurements were performed at baseline, after demineralisation and after storage in remineralisation solution for 7 and 30 days. Non-parametric tests (Kruskal–Wallis test and Friedman test) were used for further analysis. After demineralisation, all samples showed a median ΔF -9.38% ± 2.79. After 30 days median ΔF values were as followed: group I = -9.04% ± 2.51, group II = -7.89 ± 2.07, group III = -6.08% ± 2.79). The median ΔF values differed significantly between all groups at all investigation times (p < 0.00001). Application of P11-4 with fluoride varnish was superior to the use of fluorides alone for remineralisation of enamel adjacent to brackets.

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Section: Discussionmentioning

confidence: 99%

Impact of self-assembling peptides in remineralisation of artificial early enamel lesions adjacent to orthodontic brackets

Jablonski-Momeni

Nothelfer

Morawietz

et al. 2020

Sci Rep

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“…[21] Our observations also agree with the result of in-situ studies on the effects of fluoride and intraoral environment on TMA and Ni-Ti wires done by Abbassy et al ., which has reported the coverage of TMA wires with corrosion products and peeling of surface with numerous deep grooves following fluoride use intraorally, and the effects were same with Ni-Ti wires. [1422] These studies did not give a quantitative assessment as they had used SEM for evaluating the surface property. Reports from another in-vitro study conducted on commercially pure titanium using neutral fluoride solutions show that fluoride concentration more than 0.1% produced severe corrosion.…”

Section: Discussionmentioning

confidence: 99%

“…[10] With the added usage of neutral fluoride mouthwashes, the corrosion of these wires increases. [2223] According to Abbassy, the protective titanium oxide film on the surface of the wire undergoes a reaction in fluoride solutions resulting in the formation of titanium fluoride, titanium oxide fluoride, or sodium titanium fluoride on the surface of the alloy. Corrosion resistance decreases markedly and destruction of oxide layer leads to the absorption of hydrogen from various solutions because of the high affinity of titanium to hydrogen called “hydrogen embrittlement.”[23] After immersion of TMA in fluoride solution, the fracture mode is also said to change from ductile to brittle with a decrease in tensile strength.…”

Section: Discussionmentioning

confidence: 99%

Effect of oral environment and prescribed fluoride mouthwashes on different types of TMA wires – An in-vivo study

et al. 2019

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OBJECTIVE: The aim of this study was to investigate the effect of intraoral conditions and fluoride mouthwashes on mechanical properties and surface characteristics of different types of titanium molybdenum alloy (TMA) wires. MATERIALS AND METHODS: Three types of TMA wires of dimension 0.017” × 0.025” [1. Standard TMA (TMA), 2. ion-implanted, low-friction TMA (LF) and 3. Colored, Honey Dew TMA (HD)] were tested in three conditions as three groups; A) Control (as received), B) No fluoride (following intraoral use without fluoride) and C) Fluoride (following intraoral use with fluoride rinses). Surface roughness was evaluated using 3D Optical Profilometer. Three point bending tests were done to evaluate load deflection characteristics (LDR), ultimate tensile strength (UTS), and Young's modulus (E). Statistical evaluation was done using one-way analysis of variance (ANOVA), Bonferroni multiple comparison, and paired t -tests. RESULTS: Control group TMA exhibited significantly higher surface roughness, peak height, and LDR as well as lower UTS and E when compared to LF and HD ( P < 0.001). In nonfluoride group, the surface roughness and LDR increased significantly for all three types of wires ( P < 0.001). The UTS and E showed a significant decrease ( P < 0.001). Additional use of fluoride mouthwashes (fluoride group) further increased surface roughness and LDR and decreased the UTS and E ( P < 0.001). CONCLUSION: The ion-implanted LF/HD varieties had better surface smoothness, lower LDR, higher UTS, and higher E than standard TMA in the control group, pointing towards a better efficiency of these wires. Intraoral conditions significantly increased surface roughness and deteriorated mechanical properties of all types of TMA wires. With the use of daily fluoride mouthwashes, the deterioration was much worse.

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“…At present, many orthodontists use sliding mechanics for the closure of extraction spaces. During sliding mechanics, biological tissue response and tooth movement only happen when the applied force overpowers the friction between brackets and archwires [10,11]. Evidence shows that about 50% of the load required for tooth movement is spent to overcome the friction force [12].…”

Section: Introductionmentioning

confidence: 99%

“…According to a study by Walker et al [18] in 2007, the concentration of fluoride can serve as an important factor in the failure of the protective oxide layer of alloys; this superficial oxide layer, which is eliminated by fluoride, prevents oxygen diffusion and confers corrosion resistance to SS and titanium molybdenum alloy (TMA) wires [18]. Many studies have evaluated the effect of fluoride mouthwash on surface properties of wires and brackets, particularly surface roughness and friction in fixed orthodontic systems [1,11,12,18,19].…”

Section: Introductionmentioning

confidence: 99%

Effect of 0.05% Sodium Fluoride Mouthwash on Surface Roughness and Friction Between Ceramic Brackets and Rhodium-Coated and Uncoated Stainless Steel Wires

Nik¹,

Ghadirian²,

Hooshmand³

et al. 2019

fid

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Objectives:This study aimed to assess the effect of 0.05% sodium fluoride (NaF) mouthwash on the surface roughness and friction between ceramic brackets and rhodium-coated (RC) and uncoated stainless steel (SS) wires.Materials and Methods:This experimental study was performed on 48 maxillary premolar ceramic brackets. Twenty-four pieces of RC-SS wires were used. Samples were divided into four groups. Groups 1 and 2 were immersed in artificial saliva, and groups 3 and 4 were immersed in a solution consisting of artificial saliva (9%) and mouthwash (91%). To assess surface roughness, images were obtained from the surface of wires and brackets with atomic force microscopy (AFM) and scanning electron microscopy (SEM) before and after the intervention. To assess friction, the wires were ligated into brackets, and friction was measured at a crosshead speed of 0.5 mm/minute using a universal testing machine. Data were analyzed using one-way analysis of variance (ANOVA) at the 0.05 significance level.Results:Friction during sliding in RC wires was significantly less than that in SS wires (P<0.05). Increase in the friction in SS wires by mouthwash was significantly greater compared to RC wires (P<0.05). Surface roughness coefficients of the wires before the intervention were not significantly different. The surface roughness of the wires significantly increased after the intervention and it was greater in SS wires than in RC wires (P<0.05).Conclusion:Considering the lower friction and surface roughness of SS-RC wires compared to SS wires, SS-RC wires may be a better alternative for use with ceramic brackets.

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Fluoride influences nickel-titanium orthodontic wires′ surface texture and friction resistance

Cited by 24 publications

References 29 publications

Impact of self-assembling peptides in remineralisation of artificial early enamel lesions adjacent to orthodontic brackets

Impact of self-assembling peptides in remineralisation of artificial early enamel lesions adjacent to orthodontic brackets

Effect of oral environment and prescribed fluoride mouthwashes on different types of TMA wires – An in-vivo study

Effect of 0.05% Sodium Fluoride Mouthwash on Surface Roughness and Friction Between Ceramic Brackets and Rhodium-Coated and Uncoated Stainless Steel Wires

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