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

Santos, Aretha Aliny Ramos dos; Pithon, Matheus Melo; Carlo, Fabíola Galbiatti Carvalho; Carlo, Hugo Lemes; Lima, Bruno Alessandro Silva Guedes de; Passos, Tibério Andrade dos; Santos, Rogério Lacerda dos

doi:10.2319/032914-234.1

Cited by 14 publications

(44 citation statements)

References 15 publications

(28 reference statements)

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“…A study done by Dos Santos et al . [14] demonstrated that time had a gradual influence on the accumulation of biofilm, debris, and food remainders on the surface and slots of the brackets. A reduction in slot dimension observed in this study could be related to the fact that when a biomaterial is exposed to a biological system, a noncellular acquired biofilm is rapidly organized on the material surface by spontaneous adsorption of extracellular macromolecules composed of glycoproteins and proteoglycans which later calcifies and alters the structure of the biomaterial.…”

Section: Discussionmentioning

confidence: 99%

Assessment of bracket surface morphology and dimensional change

2017

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Objective:The objective of this study was to compare the surface morphology and dimensional stability of the bracket slot at the onset of treatment and after 12 months of intraoral exposure. The study also compared the amount of calcium at the bracket base which indicates enamel loss among the three orthodontic brackets following debonding after 12 months of intraoral exposure.Materials and Methods:The sample consisted of 60 (0.022” MBT) canine brackets. They were divided into three groups: self-ligating, ceramic bracket with metal slot, and stainless steel (SS) brackets. The slot dimensions, micromorphologic characteristics of as-received and retrieved brackets were measured with a stereomicroscope and scanning electron microscope (SEM), respectively. The amount of calcium at the bracket base which indicates enamel damage was quantified using energy-dispersive X-ray spectrometry (EDX).Results:The results showed statistically significant alterations (P < 0.05) in the right vertical dimension, internal tie wing width (cervical), right and left depth of the slot (Kruskal–Wallis test). Multiple comparison using Mann–Whitney test showed that ceramic brackets underwent (P < 0.05) minimal alterations in the right vertical dimension, internal tie wing width (cervical), right and left depth of the slot (0.01 mm, −0.003 mm, 0.006 mm, −0.002 mm, respectively) when compared with the changes seen in SS and self-ligating brackets. SEM analysis revealed an increase in the surface roughness of ceramic with metal slot brackets and self-ligating bracket showed the least irregularity. The presence of calcium was noted on all evaluated brackets under EDX, but ceramic with metal slot brackets showed a significantly greater amount of enamel loss (P = 0.001).Conclusion:Ceramic brackets were found to be dimensionally stable when compared to SS and self-ligating. Self-ligating bracket showed minimal surface irregularity. Ceramic with metal slot brackets showed a greater amount of enamel loss following debonding.

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Section: Discussionmentioning

confidence: 99%

Assessment of bracket surface morphology and dimensional change

2017

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“…Biofilm and debris buildup in the slot of orthodontic brackets, in addition to long periods of treatment, have been shown to exert greater influence on the degradation process and friction force of these devices when compared to the actual oral pH 17 . There are reports on the effects of prophylactic techniques in conventional brackets without 13 and after clinical use, 18 but little has been said about the effects of prophylactic techniques on debris buildup in self-ligating brackets after clinical use, compared with conventional brackets.…”

Section: Discussionmentioning

confidence: 99%

Air-powder polishing on self-ligating brackets after clinical use: effects on debris levels

Aragón

Lima

Normando

2016

Dental Press J. Orthod.

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Introduction: Debris buildup on brackets and arch surfaces is one of the main factors that can influence the intensity of friction between bracket and orthodontic wire. Objective: This study sought to evaluate the effect of air-powder polishing cleaning on debris levels of self-ligating ceramic brackets at the end of orthodontic treatment, compared to the behavior of conventional brackets. Methods: Debris levels were evaluated in metal conventional orthodontic brackets (n = 42) and ceramic self-ligating brackets (n = 42) on canines and premolars, arranged in pairs. There were brackets with and without air-powder polishing. At the end of orthodontic treatment, a hemiarch served as control and the contralateral hemiarch underwent prophylaxis with air-powder polishing. Debris buildup in bracket slots was assessed through images, and Wilcoxon test was used to analyze the results. Results: The median debris levels were statistically lower in the conventional metal brackets compared to self-ligating ones (p = 0.02), regarding brackets not submitted to air-powder polishing. Polishing significantly reduced debris buildup to zero in both systems, without differences between groups. Conclusions: Ceramic self-ligating brackets have a higher debris buildup in comparison to conventional metal brackets in vivo, but prophylaxis with sodium bicarbonate jet was effective in reducing debris levels in self-ligating and also in conventional brackets.

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“…As a result, the duration of treatment may be extended if there is no wire sliding through the bracket. Other consequences, such as more susceptibility to plaque accumulation (5), ions release in the oral cavity (6), and increased corrosion rate (7) have also caused problems in orthodontic treatment and to health of the patients. In general, it is reported that esthetic orthodontic wires do not have adequate properties for use in Orthodontics (8).…”

Section: Introductionmentioning

confidence: 99%

Deflection and Flexural Strength Effects on the Roughness of Aesthetic-Coated Orthodontic Wires

et al. 2017

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The aim was to evaluate the flexural strength and the effects of deflection on the surface roughness of esthetic orthodontic wires. The sample consisted of 70 archwire 0.014-inch: polytetrafluorethylene (PTFE)-coated Nickel-Titanium (Niti) archwires (Titanol Cosmetic-TC, Flexy Super Elastic Esthetic-FSE, esthetic Nickel Titanium Wire-ANT); epoxy resin-coated Niti archwires (Spectra-S, Niticosmetic-TEC); gold and rhodium coated Niti (Sentalloy-STC) and a control group (superelastic Niti (Nitinol-NS). The initial roughness was evaluated with a rugosimeter. After that, the wires were submitted to flexural test in an universal testing machine. Each wire was deflected up to 2 mm at a speed of 1 mm/min. After flexural test, the roughness of the wires was evaluted on the same surface as that used for the initial evaluation. The data of roughness and flexural strength were analyzed by one-way ANOVA and Tukey's test (α=0.05). Student t-test compared roughness before and after deflection (α =0.05). The roughness of S and ANT (epoxy resin and PTFE-coated wires, respectively), before and after deflection, was significantly higher than the other groups (p<0.05). Wire deflection significantly increased the roughness of the wires S and STC (p<0.05). The flexural strength of groups FSE and NS (PTFE and uncoated) was higher compared with that of the other groups (p<0.05). We concluded that the roughness and flexural strength of the orthodontic wires does not depend on the type of the esthetic coating, but it is influenced by the method of application of this coating. The deflection can increase the roughness of the esthetic orthodontic wires.

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

Cited by 14 publications

References 15 publications

Assessment of bracket surface morphology and dimensional change

Assessment of bracket surface morphology and dimensional change

Air-powder polishing on self-ligating brackets after clinical use: effects on debris levels

Deflection and Flexural Strength Effects on the Roughness of Aesthetic-Coated Orthodontic Wires

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