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      COLOR STABILITY OF A NANOFILL COMPOSITE: EFFECT OF DIFFERENT IMMERSION MEDIA

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          Abstract

          Objective:

          The aim of this in vitro study was to evaluate the color stability of a nanofill composite resin (Filtek Z350) in different immersion media.

          Materials and methods:

          Twelve resin-based composite specimens were prepared using a silicon cylindrical mold measuring ≅1mm of thickness and ≅ 10mm of diameter. Specimens were light-cured for 40 s from both sides using a LED Radii at 1400 mW/cm 2 and were randomized into 4 groups (n= 3) according to immersion media: coffee, yerba mate, grape juice or water (control solution). A digital spectrophotometer was used to evaluate the color changes at baseline and at 1-week after immersion in each solution. Specimens were stored in the different staining media for 4 h/day during 1 week. The color differences (ΔE) were analyzed by paired t-test and one-way ANOVA with complementary Tukey test (p<0.05).

          Results:

          After 1-week of immersion, a perceptive color change for the group stored in the grape juice compared to baseline (p=0.008) was observed. Coffee and yerba mate did not show any color changes visible for the human eyes or significantly different from the control group (p>0.05)

          Conclusions:

          The findings of the present study suggest that the tested nanofill resin-based composite was susceptible to staining by substances present in the grape juice.

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          Most cited references60

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          The bleaching of teeth: a review of the literature.

          Andrew Joiner (2006)
          To review current knowledge of tooth whitening with respect to external bleaching methods. The scope is the external bleaching of vital teeth and focuses on mechanisms; in vivo and in vitro measurement methods, and factors influencing the efficacy of the whitening process. "Medline" and "ISI Web of Science" databases from 1966 and 1974, respectively were searched electronically with key words tooth, teeth, colo*r, white*, bleach* and peroxide. The importance of tooth whitening for patients and consumers has seen a dramatic increase in the number of products and procedures over recent years, with a concomitant rise in publications on this topic. Literature suggests that the mechanisms of tooth whitening by peroxide occur by the diffusion of peroxide through enamel to cause oxidation and hence lightening of coloured species, particularly within the dentinal regions. A number of approaches are available for measuring changes in tooth colour. These include visual measurements by trained clinicians and instrumental measurements using spectrophotometry, chromameters and digital image analysis. The key factors that affect tooth whitening efficacy by peroxide containing products are concentration and time. In general, higher concentrations are faster than lower concentrations. However, lower concentrations can approach the efficacy of higher concentrations with extended treatment times. Alternative bleach systems to peroxide have received only minor attention. The efficacy of light activated systems versus non-light activated controls in clinical studies is limited and conflicting. Other factors which can influence tooth bleaching outcome include type of stain, initial tooth colour and subject age.
          Article 0 comments Cited 166 times – based on 0 reviews     Review now
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            Influence of food-simulating solutions and surface finish on susceptibility to staining of aesthetic restorative materials.

            R. Bagheri, M Tyas, Heather M. Burrow (2005)
            To determine the degree of surface staining of resin-based composites (RBCs) and glass-ionomer cements (GICs) after immersion in various stains and food-simulating solutions (FSS). Six tooth-coloured restorative materials were used: a light-cured microfilled RBC (Durafil, Kulzer), a light-cured microglass RBC (Charisma, Kulzer), a polyacid-modified RBC (F2000, 3M/ESPE), a conventional GIC (Fuji IX, GC) and two resin-modified GICs (Fuji II LC, GC; Photac Fil, 3M/ESPE). Disk-shaped specimens were prepared and tested with either a matrix finish or polished using wet silicon carbide papers up to 2000 grit. All specimens were immersed in 37 degrees C distilled water for 1 week, followed by three different FSS (water, 10% ethanol, Crodamol GTCC) and five stains (red wine, coffee, tea, soy sauce and cola) for a further 2 weeks. Three specimens of each material for each stain were tested. Colour coefficients (CIE L* a* b*) were measured by a spectrophotometer after each treatment. The change in colour (DeltaEn) was calculated using the formula: DeltaEn=[(DeltaLn+(Deltaa(n))2+(Deltab(n))2]1/2. Distilled water caused no perceptible colour change as tested by ANOVA and Tukey's tests. The effect of surface finish on staining was not statistically significant (P>0.05). There was no strong interaction between FSS and stains or between FSS and materials. There was a strong interaction between surface and material, and stain and material (P<0.001). All materials were susceptible to staining by all stains especially coffee, red wine and tea; Fuji IX showed the least susceptibility and F2000 the greatest.
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              Color stability of resin composites after immersion in different drinks.

              Ahmet GÜLER, Meryem Yücel, Ertan Ertas … (2006)
              The purpose of this study was to evaluate the discoloration of two nanohybrids, two microhybrids, and a posterior composite resin restorative material upon exposure to different drinks--namely tea, cola, coffee, red wine, and water. The colors of all specimens before and after storage in the solutions were measured by a colorimeter based on CIE Lab system, and the color differences thereby calculated. Data were analyzed by two-way analysis of variance (ANOVA) and Tukey's HSD test. According to ANOVA, the restorative material, staining agent, and their interaction were found to play a statistically significant role (P = 0.0001) in color change. Among the staining agents, water consistently showed the lowest deltaE* value for all materials, whereas red wine showed the highest deltaE* value. In other words, for all the materials tested, their color change in staining agents ranked in this increasing order: water < cola < tea < coffee < red wine. In terms of comparison among the five restorative materials, Filtek P60 and Z250 were observed to manifest less color change than the nanohybrids and Quadrant LC.
              Article 0 comments Cited 118 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): J Appl Oral Sci
                Journal ID (iso-abbrev): J Appl Oral Sci
                Title: Journal of Applied Oral Science
                Publisher: Faculdade de Odontologia de Bauru da Universidade de São Paulo (Bauru )
                ISSN (Print): 1678-7757
                ISSN (Electronic): 1678-7765
                Publication date (Print and electronic): October 2009
                Publication date (Print): October 2009
                Volume: 17
                Issue: 5
                Pages: 388-391
                Affiliations
                [1 ]DDS, MS, PhD student, Department of Operative Dentistry, Dental School, Federal University of Pelotas, Pelotas, RS, Brazil
                [2 ]DDS, Private Practice, Porto Alegre, RS, Brazil
                [3 ]DDS, MS, PhD, Adjunct Professor, Department of Operative Dentistry, Federal University of Paraíba, João Pessoa, PB, Brazil
                Author notes
                Corresponding address: Sônia Saeger Meireles - Avenida Umbuzeiro, 755 apt 901, Bairro: Manaíra - 58038-180, João Pessoa - PB - Brazil - Phone: +55 83 32167250 - e-mail: soniasaeger@ 123456hotmail.com
                Article
                Publisher ID: S1678-77572009000500007
                DOI: 10.1590/S1678-77572009000500007
                PMC ID: 4327661
                PubMed ID: 19936513
                SO-VID: ca5149d8-e184-4278-9d72-c3784fc591a9
                License:

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 13 August 2008
                Date revision received : 18 May 2009
                Date accepted : 09 November 2008
                Page count
                Figures: 1, Tables: 1, Equations: 0, References: 20, Pages: 4
                Categories
                Subject: Original Article

                Keywords: composite resins,nanoparticles,staining
                Data availability:
                Keywords: composite resins, nanoparticles, staining

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