The effect of pH, fluoride and tribocorrosion on the surface properties of dental archwires

Močnik, Petra; Kosec, Tadeja; Kovač, Janez; Bizjak, M.

doi:10.1016/j.msec.2017.04.050

Cited by 45 publications

(40 citation statements)

References 37 publications

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“…This acid production alters the normal salivary pH, exerting some negative effects on the properties and performance of orthodontic brackets and auxiliaries, including coated aesthetic archwires. Low pH exposure has been shown to cause surface corrosion on the NiTi-based archwires, regardless of their percentage composition and often exacerbated by the presence of fluoride ( Perinetti et al, 2010 , Močnik et al, 2017 ).…”

Section: Discussionmentioning

confidence: 99%

Effects of salivary pH on coating durability of two different aesthetic archwire coatings under a simulated intraoral environment

Abdulkader

Kamaruddin

Mydin

2020

The Saudi Dental Journal

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Objectives This study compared the effects of normal salivary pH, and acidic pH found in patients with poor oral hygiene, on the durability of aesthetic archwire coated with epoxy resin and polytetrafluoroethylene (PTFE). Methods The posterior parts of the archwires were sectioned into 20 mm segments (N = 102) and divided among six groups. Four groups were treated with different pH levels and two served as controls. The specimens were immersed in individual test tubes containing 10 ml of artificial saliva adjusted to a pH of 6.75 or 3.5. The tubes were sealed and stored in a 37 °C water bath for 28 days. After 28 days, the specimens were ligated to brackets embedded in an acrylic block and subjected to mechanical stress using an electronic toothbrush for 210 s. The specimens were photographed, and images were measured for coating loss using AutoCAD® software. Surface morphology was observed using a scanning electron microscope (SEM). Results Significant coating loss ( p < 0.001) was found in the epoxy resin groups, regardless of pH value, but not in the PTFE groups. The acidic pH caused epoxy resin layer coating loss by twice as much as normal pH. SEM revealed existing manufacturing defects on the as-received epoxy resin coating, whereas the retrieved epoxy resin demonstrated rupture, roughness, and coating loss in multiple locations. Significance Epoxy resin coatings demonstrate poor durability in acidic environments. This condition is worsened by the existing manufacturing defects found on as-received archwires. Hence, archwires coated with epoxy resin are not recommended in patients with poor oral hygiene.

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Section: Discussionmentioning

confidence: 99%

Effects of salivary pH on coating durability of two different aesthetic archwire coatings under a simulated intraoral environment

Abdulkader

Kamaruddin

Mydin

2020

The Saudi Dental Journal

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“…When the metal oxide of Ni–Ti or SS is stable, the surface of the alloy acts as a cathode; when the surface is passivated, it acts as an anode. 33 When added, negative proteins act synergistically with oxygen and combine with metal ions to accelerate dissolution. However, as time goes on, increasingly more proteins would adsorb and accumulate onto the alloy surface.…”

Section: Discussionmentioning

confidence: 99%

Corrosion Behavior and In Vitro Cytotoxicity of Ni–Ti and Stainless Steel Arch Wires Exposed to Lysozyme, Ovalbumin, and Bovine Serum Albumin

Zhang

Chen

et al. 2020

ACS Omega

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In this study, the tendency and mechanisms by which protein and mechanical loads contribute to corrosion were determined by exposing Ni–Ti and stainless steel arch wires under varying mechanical loads to artificial saliva containing different types of protein (lysozyme, ovalbumin, and bovine serum albumin). The corrosion behavior and in vitro cytotoxicity results show that exposure to both protein and mechanical stress significantly decreased the corrosion resistance of stainless steel and increased the release of toxic corrosion products. Adding protein inhibited the corrosion of Ni–Ti, but the mechanical loads counteracted this effect. Even proteins containing the same types of amino acids had different effects on the corrosion resistance of the same alloy. The effect of protein or stress, or their combination, should be considered in the application of metal medical materials.

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“…In vitro studies [2, 4] have shown that metal ions such as nickel, cobalt, and chromium, released either from corroded orthodontic brackets and archwires, induce oxidative stress. Despite the smaller corrosion susceptibility of titanium alloys, due to the protective titanium oxide layer, mechanical friction in the contact between bracket and archwire during orthodontic treatment leads to the disruption of the protective titanium oxide layer [18, 19], causing corrosion and release of titanium ions, which might increase ROS production [1]. Likewise, the in vivo study by Buczko et al [5] explained the increase of ROS/AD ratio in saliva after one week as an effect of heavy metal exposure during orthodontic treatment, since the highest concentration of nickel ions was measured simultaneously.…”

Section: Discussionmentioning

confidence: 99%

Systemic Level of Oxidative Stress during Orthodontic Treatment with Fixed Appliances

Kovač

Poljšak

Perinetti

et al. 2019

BioMed Research International

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The aim of the study was to assess the level of selected systemic oxidative stress parameters during the first week of orthodontic treatment with fixed appliances. Fifty-four males with malocclusion and having a similar lifestyle were randomized using a computer based procedure and allocated to either the treatment group (TG; n=27;24.6 ± 1.7 years) or control group (CG; n=27;24.7 ± 1.7 years). Capillary blood was collected at baseline and 6 hours, 24 hours, and 7 days after archwire insertion. At the same time points, capillary blood was retrieved in the CG. In order to determine the oxidative stress, both the reactive oxygen species (ROS) formation and the antioxidative defense (AD) potential were measured using the ROS testing and oxygen free radicals defense (equivalent to antioxidant defense) testing, respectively, by a blinded operator. The ratio between ROS and AD (ROS/AD) was calculated and data were analyzed using nonparametric tests. No drop-outs or harms were detected. At baseline, neither ROS (1.54 [1.22;2.12] and 1.74 [1.40;2.01] for the TG and CG, respectively), AD (1.19 [0.66;1.50] and 1.19 [0.57;1.42] for the TG and CG, respectively), nor ROS/AD levels were significantly different (p>0.05). After 24 hours, the ROS level significantly increased in the TG (2.05 [1.71;2.26]) and was higher compared to the CG ROS level (1.67 [1.29;1.95]; p=0.025), while for the AD level, no marked between and within group differences were detected. A notable change of ROS/AD ratio was observed over time only within the TG (p=0.026). Moreover, a significantly higher ROS/AD ratio was detected 24 hours after archwire insertion in the TG compared to the CG (2.69 [1.44;3.89] and 1.79 [1.45;2.35], respectively), followed by a decrease. Orthodontic treatment with fixed appliances might induce systemic oxidative stress in the short-term, since ROS levels and ROS/AD levels are normalized within 7 days after archwire insertion.

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The effect of pH, fluoride and tribocorrosion on the surface properties of dental archwires

Cited by 45 publications

References 37 publications

Effects of salivary pH on coating durability of two different aesthetic archwire coatings under a simulated intraoral environment

Effects of salivary pH on coating durability of two different aesthetic archwire coatings under a simulated intraoral environment

Corrosion Behavior and In Vitro Cytotoxicity of Ni–Ti and Stainless Steel Arch Wires Exposed to Lysozyme, Ovalbumin, and Bovine Serum Albumin

Systemic Level of Oxidative Stress during Orthodontic Treatment with Fixed Appliances

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