Evaluation of physical properties of esthetic brackets after clinical use: Study in situ

Pithon, Matheus Melo; Figueiredo, Daniel Santos Fonseca; Oliveira, Dauro Douglas; Santos, Rogério Lacerda dos

doi:10.1016/j.ejwf.2013.07.002

Cited by 5 publications

(26 citation statements)

References 22 publications

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“…This finding is related to the intraslot wear and/or deformation 7,8 due to the dental sliding mechanics, torque, and progressive increase in the thickness of the wires used in the brackets, which is in agreement with the findings of other studies. 9,10 The brackets exposed to the oral environment for a longer time of use presented greater signs of pitting corrosion, plastic deformation, gaps, scratches, and deposition of debris.…”

Section: Discussionsupporting

confidence: 82%

“…9,10 The brackets exposed to the oral environment for a longer time of use presented greater signs of pitting corrosion, plastic deformation, gaps, scratches, and deposition of debris. 7 The presence of precipitated biofilm found on the recovered brackets is in agreement with the findings of other studies of esthetic 8 and metal brackets 3 and orthodontic wires. 2,11 SEM analysis showed areas of dark surface, which indicated the presence of precipitated biofilm associated with other bright surface areas.…”

Section: Discussionsupporting

confidence: 81%

“…In addition to wires, the increase in frictional force may also have been generated by the presence of biofilm and dietary debris on the surface and mainly on the bracket slots. 3,8 This appears to be an important factor to consider when the force to be applied is calculated. 18 The surface roughness of wires is also significantly related to the increase in the levels of frictional a P value: one-way analysis of variance, followed by Tukey multiple comparisons test.…”

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confidence: 99%

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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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Section: Discussionsupporting

confidence: 82%

Section: Discussionsupporting

confidence: 81%

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confidence: 99%

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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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“…Although some authors have demonstrated that metal ligatures (ties) produce less friction than the elastomeric ligatures, the force generated during the placement of the metal ligature is subjective, and could vary according to the orthodontist 7,8,11 . In this trial, elastic ligatures of the Super Slick (TP Orthodontics) brand were used, because researches conducted by the manufacturer revealed a reduction of over 70% in the friction between the metallic orthodontic wire and this ligature.…”

Section: Discussionmentioning

confidence: 99%

“…Each test specimen was fastened to the brackets of the device by means of transparent elastic ligatures 7,8 (Mini Stix Ligature Ties Non-Coated -TP Orthodontics), that was changed in every trial. The test method selected was the three-point bending test 5,9 and Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Mechanical properties of orthodontic wires on ceramic brackets associated with low friction ligatures

Koike

Mikami

Lacerda‐Santos

et al. 2017

Rev. odontol. UNESP

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ResumoIntrodução: Poucos estudos investigaram as propriedades mecânicas dos fios ortodônticos em bráquetes cerâmicos associados às ligaduras. Objetivo: O objetivo deste estudo foi comparar a carga-deflexão de fios ortodônticos com seção redonda de 0,016" de aço inoxidável (AI), níquel-titânio (NiTi) e composto de polímero reforçado com fibra de vidro (CPRFV). Material e método: Sessenta espécimes obtidos a partir de 10 arcos pré-contornos seccionados (TP Orthodontics), foram divididos em 3 grupos de 20 de acordo com cada tipo de material (1 fio estético e 2 não estético) e comprimento de 50 mm. A metodologia consistiu de um teste de flexão de 3 pontos usando bráquetes estéticos cerâmicos (INVU, TP Orthodontics, Edgewise, 0,022 "x 0,025") como pontos de suporte. Os ensaios de tração foram realizados em uma máquina de ensaios mecânicos, a uma velocidade de 10 mm / min, deflexão de 1 mm, 2 mm e 3 mm. Utilizou-se o teste não-paramétrico de comparações múltiplas de Friedman (P <0,05). Resultado: O fio de níquel-titânio apresentou menor carga / deflexão em relação ao aço inoxidável. Os fios CPRFV tiveram valores de resistência mais baixos entre todos os grupos avaliados (P <0,05). O fio de aço mostrou deformação permanente após deflexão de 3 mm, fio NiTi demonstrou efeito de memória e o tipo estético teve fraturas com perda de força. Conclusão: Pode-se concluir que os fios de aço têm valores de resistência elevados, exigindo a incorporação de alças e dobras para reduzir a carga / deflexão. Os fios NiTi e CPRFV produziram baixos níveis de força, porém o fio estético mostrou-se fraturado e quebrado. Descritores: Fios ortodônticos; elastômeros; materiais odontológicos. AbstractIntroduction: Few studies investigated the mechanical properties of orthodontic wires on ceramic brackets associated the ligatures. Objective: This study aimed to compare the load-deflection of orthodontic wires with round section of 0.016" made of stainless steel (SS), nickel-titanium (NiTi) and glass fiber-reinforced polymer composite (GFRPC). Material and method: Sixty specimens obtained from 10 sectioned pre-contoured arches (TP Orthodontics), were divided into 3 groups of 20 according to each type of material (1 esthetic-type wire and 2 not esthetic) and length of 50 mm. The methodology consisted of a 3-point bending test using esthetic ceramic brackets (INVU, TP Orthodontics, Edgewise, 0.022"x 0.025") as points of support. The tensile tests were performed on a mechanical test machine, at a speed of 10 mm/min, deflection of 1 mm, 2 mm and 3 mm. Friedman's Non Parametric Multiple comparisons test was used (P<0.05). Result: The nickel-titanium wire presented smaller load/ deflection compared with stainless steel. GFRPC wires had lower strength values among all groups evaluated (P<.05). The steel wire showed permanent deformation after 3 mm deflection, NiTi wire demonstrated memory effect and the esthetic type had fractures with loss of strength. Conclusion: It can be concluded that steel wires have high strength values, requiring the incorporati...

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Metal ions leachables from fake orthodontic braces incubated in simulated body fluid

2021

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Background The demand for fake braces usage in Southeast Asia are increasing but lack of certification and information on fake braces as medical devices from regulated bodies raised a concern towards its safety. The aim of this study was to determine the types of metal ion leachable from removable fake braces based on heavy metal ions present in metallic materials, immersed in simulated body fluid (SBF) and analysed using inductively coupled plasma atomic emission spectroscopy. Methods Three sets of fake braces and one control were dissembled to only their brackets and archwires and immersed separately in SBF. They were placed in an incubator shaker at a temperature of 37 °C at 50 rpm. A 3.0 ml measurement of SBF was taken out from the sample containers at days 7, 14 and 28 and kept at − 20 °C for further analysis. Data were analysed using SPSS version 26.0 (IBM, Armonk, USA) (P < 0.05). Descriptive and one-way ANOVA analyses with Bonferroni post hoc tests were used to assess the significant differences between the metal ions released in SBF from the control samples and fake braces. Results All 23 elements under investigation except Si ions were detected from the control samples and fake braces. There were significant increased K ions and reduced levels of Mg ions from the fake archwires and brackets. Most ions released were less than 10 mg/L (Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, Cd, Pb, Al) or 1 mg/L (Li, Ba) into the SBF medium. Conclusion There were significant release of Ca and K ions from the fake samples. Elements such as Li, Ba, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, Cd and Sb had increased in concentration at day 7 and the concentration plateaued until day 28.

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Evaluation of physical properties of esthetic brackets after clinical use: Study in situ

Cited by 5 publications

References 22 publications

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

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

Mechanical properties of orthodontic wires on ceramic brackets associated with low friction ligatures

Metal ions leachables from fake orthodontic braces incubated in simulated body fluid

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