Color stability of modern composites subjected to different periods of accelerated artificial aging

Drubi-Filho, Brahim; Garcia, Lucas da Fonseca Roberti; Cruvinel, Diogo Rodrigues; Sousa, Ana Beatriz Silva; Pires‐de‐Souza, Fernanda de Carvalho Panzeri

doi:10.1590/s0103-64402012000500018

Cited by 19 publications

(16 citation statements)

References 23 publications

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“…Unfortunately, only a small number of researchers combine selected environmental factors: most studies are known from the research of industrial composites. Accelerated artificial ageing protocols typically use long intervals of exposure to UV-B rays, humidity, and alterations in temperature [158][159][160]. Some studies try to use more accurate protocols to simulate ageing in mouth, such as protocols based on a pH-cycling regimen and tooth brushing cycles [161,162].…”

Section: In Vitro Ageingmentioning

confidence: 99%

Ageing of Dental Composites Based on Methacrylate Resins—A Critical Review of the Causes and Method of Assessment

Szczesio-Włodarczyk

Sokołowski

Kleczewska³

et al. 2020

Polymers

112

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The paper reviews the environmental factors affecting ageing processes, and the degradation of resins, filler, and the filler-matrix interface. It discusses the current methods of testing materials in vitro. A review of literature was conducted with the main sources being PubMed. ScienceDirect, Mendeley, and Google Scholar were used as other resources. Studies were selected based on relevance, with a preference given to recent research. The ageing process is an inherent element of the use of resin composites in the oral environment, which is very complex and changes dynamically. The hydrolysis of dental resins is accelerated by some substances (enzymes, acids). Bonds formed between coupling agent and inorganic filler are prone to hydrolysis. Methods for prediction of long-term behaviour are not included in composite standards. Given the very complex chemical composition of the oral environment, ageing tests based on water can only provide a limited view of the clinical performance of biomaterial. Systems that can reproduce dynamic changes in stress (thermal cycling, fatigue tests) are better able to mimic clinical conditions and could be extremely valuable in predicting dental composite clinical performance. It is essential to identify procedure to determine the ageing process of dental materials.

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Section: In Vitro Ageingmentioning

confidence: 99%

Ageing of Dental Composites Based on Methacrylate Resins—A Critical Review of the Causes and Method of Assessment

Szczesio-Włodarczyk

Sokołowski

Kleczewska³

et al. 2020

Polymers

112

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“… 15 The CIELAB system of color assessment quantitatively assess the color features of an object, based on three parameters (L*, a* e b*): L* is the measurement of brightness quantified on a scale in which black has an L* value equal to zero, whereas a totally reflected light has an L* value equal to 100; a* measures the amount of red (+a*) and green (-a*); and b* measures the amount of yellow (+b*) and blue (-b*). Total color changes (Δ E*ab) were calculated by the following equation: 16 Δ E*ab = [(Δ L*)² + (Δ a*)² + (Δ b*)²]1/2.…”

Section: Staining Analysismentioning

confidence: 99%

Color stability of ceramic brackets immersed in potentially staining solutions

Guignone

Silva

Soares

et al. 2015

Dental Press J. Orthod.

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OBJECTIVE: To assess the color stability of five types of ceramic brackets after immersion in potentially staining solutions. METHODS: Ninety brackets were divided into 5 groups (n = 18) according to brackets commercial brands and the solutions in which they were immersed (coffee, red wine, coke and artificial saliva). The brackets assessed were Transcend (3M/Unitek, Monrovia, CA, USA), Radiance (American Orthodontics, Sheboygan, WI, USA), Mystique (GAC International Inc., Bohemia, NY, USA) and Luxi II (Rocky Mountain Orthodontics, Denver, CO, USA). Chromatic changes were analyzed with the aid of a reflectance spectrophotometer and by visual inspection at five specific time intervals. Assessment periods were as received from the manufacturer (T0), 24 hours (T1), 72 hours (T2), as well as 7 days (T3) and 14 days (T4) of immersion in the aforementioned solutions. Results were submitted to statistical analysis with ANOVA and Bonferroni correction, as well as to a multivariate profile analysis for independent and paired samples with significance level set at 5%. RESULTS: The duration of the immersion period influenced color alteration of all tested brackets, even though these changes could not always be visually observed. Different behaviors were observed for each immersion solution; however, brackets immersed in one solution progressed similarly despite minor variations. CONCLUSIONS: Staining became more intense over time and all brackets underwent color alterations when immersed in the aforementioned solutions.

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“…The susceptibility of the composite to percolation of staining substances is related to its chemical composition, which includes the type of monomer, the type of inorganic filler, the used photoinitiator and the quality of the matrix/filler interface 14 . It is also modulated by its degree of conversion and network characteristics, since a low degree of conversion leads to degradation of the polymer network and release of byproducts 6,12,15,16 . The nanocomposite used in this study is recommended to both anterior and posterior restorations and has been characterized elsewhere 17 , revealing a degree of conversion of 46% on the top surface and of 38% on the bottom surface of a 2 -mm thick specimen.…”

Section: Resultsmentioning

confidence: 99%

Tooth whitening recovers the color of pre-stained composites

et al. 2017

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Aim: To assess the effect of home-whitening on aged and stained composite. Methods: Fifteen discshaped specimens (10 mm diameter x 2 mm thick) of Filtek Z350XT, shade A2E were fabricated, polished and embedded in wax, leaving exposed the top surface. The specimens were allocated to three groups (n=5): A -the specimens remained dry; B -conditioning in distilled water and; C -conditioning in distilled water and coffee. They were next subjected to whitening with 10% carbamide peroxide (Whiteness Perfect) for 4 h daily for 1, 2 and 4 weeks. Shade was measured with a spectrophotometer Easyshade and expressed based on the CIE L*a*b* system (ΔE*). Surface roughness was measured with a roughness meter (Ra-µm). Data were analyzed with two-way ANOVA and Tukey's test (α=0.05). Results: Conditioning, grouping and the interaction between both, influenced the ΔE* (p<0.0001), which exceeded the 3.3 threshold for visible color change after conditioning of Group C in black coffee. Whitening for 1 week significantly reduced ΔE* in this group. There were no significant changes in surface roughness. Conclusions: Home-whitening did not alter significantly the color of the nanocomposite, except when it was previously stained. One-week whitening was sufficient to recover color change to an acceptable level.

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Color stability of modern composites subjected to different periods of accelerated artificial aging

Cited by 19 publications

References 23 publications

Ageing of Dental Composites Based on Methacrylate Resins—A Critical Review of the Causes and Method of Assessment

Ageing of Dental Composites Based on Methacrylate Resins—A Critical Review of the Causes and Method of Assessment

Color stability of ceramic brackets immersed in potentially staining solutions

Tooth whitening recovers the color of pre-stained composites

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