Influence of artificial saliva on abrasive wear and microhardness of dental composites filled with nanoparticles

Mayworm, Camila D.; Camargo, S.S.; Bastian, Fernando Luíz

doi:10.1016/j.jdent.2008.05.001

Cited by 79 publications

(62 citation statements)

References 31 publications

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“…It was proposed that this surface change occurred in the post-curing polymeric materials due to temperature and the time of exposure, a fact indicated in a study by Mayworm (18). Dye had no influence on the roughness and the used bleaching product when evaluated in isolation, evidenced no changes in roughness as well.…”

Section: Discussionmentioning

confidence: 99%

“…These differences in color change may be related to the size and distribution of the filler material, since the two composites have almost the same volume of filler material (Z350 -59.5% and TPH3 -58%). It is known, through the use of a qualitative microstructural characterization performed by Mayworm (18), that TPH3 has smaller particles than Filtek Z350, due to the presence of nanoclusters. Therefore, for the same volume, a smaller particle size would present a greater surface area in contact with the matrix.…”

Section: Discussionmentioning

confidence: 99%

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Changes in surface roughness and color stability of two composites caused by different bleaching agents

et al. 2012

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The objective of this study was to evaluate the effect of two bleaching agents (10% and 35% hydrogen peroxide) on the color stability and surface roughness of two composites, one nanohybrid and one nanoparticle. Specimens were polished, aged, stained, bleached and polished again. The action of the bleaching agents on the composites was analyzed using a profilometer (surface roughness) and a spectrophotometer (color stability). The effect of polishing the composites on the surface roughness and the resumption of the composite color was also evaluated. The results were analyzed statistically by ANOVA and Tukey's test at 5% significance level. The analysis indicated that the nanohybrid composite was more affected by staining. The bleaching agents were not able to promote bleaching of either composite over the evaluation period. Surface polishing returned nanohybrid composite to its original color condition, which did not occur for the nanoparticle composite. Additionally, polishing did not return the surface roughness of either composite to its original value. It may be concluded that polishing surface after bleaching should not be the treatment of choice, as it was not possible to reverse the roughness of the composites to their original values, suggesting that a more extensive and irreversible degradation might have occurred.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Changes in surface roughness and color stability of two composites caused by different bleaching agents

et al. 2012

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“…29,30 Most of the available studies, however, only determined the reduced mechanical properties of resins after aging in artificial saliva, alcohol, and distilled water. 31,32 To date, only limited information is available on the long-term behavior of contemporary polymers such as PEEK with regard to different aging regimens. The purpose of this study was to determine the physicomechanical characteristics of PMMA, composite resin, and PEEK after different aging regimens and durations with the following assessment methods: roughness, solubility, water absorption, Martens hardness, and indentation modulus.…”

Section: Introductionmentioning

confidence: 99%

Physicomechanical characterization of polyetheretherketone and current esthetic dental CAD/CAM polymers after aging in different storage media

Liebermann

Wimmer

Schmidlin

et al. 2016

The Journal of Prosthetic Dentistry

173

126

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STATEMENT OF PROBLEM: Polyetheretherketone (PEEK) can be used to support fixed dental prostheses. However, information about physicomechanical characterization is still scarce. PUR-POSE: The purpose of this in vitro study was to assess effects of different aging regimens/durations on roughness, solubility, water absorption, Martens hardness (HM), and indentation modulus/EIT on different computer-aided design and computer-aided manufacturing (CAD/CAM) polymers. MATERIAL AND METHODS: Forty standardized specimens of the following materials were fabricated: PEEK: Dentokeep (DK); hybrid material: VITA Enamic (EN); composite resins: LAVA Ultimate (LU) and an experimental CAD/CAM nanohybrid-composite resin (EX); poly(methyl methacrylate) (PMMA)-based: VITA CAD-Temp (CT); Telio CAD (TC), artBloc Temp (AT), and ZENOTEC ProFix (ZP). A nanofilledpolymer for interim restorations, Protemp 4 (CG), served as the control group. Specimens were stored in sodium chloride, artificial saliva, physiological saliva, and distilled water at 37°C for 1, 7, 14, 28, 90, and 180 days. Roughness, water absorption, HM, and EIT were investigated after each storage period; solubility was determined after 180 days only. Data were analyzed using weighted 3/2/1-way ANOVA and the post hoc Scheffé tests (=.05). RESULTS: Storage media had no effect on surface roughness and water absorption. Physiological saliva revealed the highest significant impact on solubility followed by artificial saliva, sodium chloride, and distilled water. Water absorption increased significantly with storage duration. PEEK showed the lowest solubility and water absorption values. The highest solubility was observed for the conventional polymer CG, and the highest water absorption was found for the composite LU. PMMA-based TC, ZP, CG, and AT showed the lowest HM and indentation modulus, followed by CT, and PEEK. The highest values were observed for the hybrid material EN, followed by LU and EX. CONCLUSIONS: The hardness parameters of PEEK were comparable with those of PMMA-based materials. group. Specimens were stored in sodium chloride, artificial saliva, physiological saliva, and distilled water at 37°C for 1, 7, 14, 28, 90, and 180 days. Roughness, water absorption, HM, and E IT were investigated after each storage period; solubility was determined after 180 days only. Data were analyzed using weighted 3/2/1-way ANOVA and the posthoc Scheffé tests (α=05).Results. Storage media had no effect on surface roughness and water absorption.Physiological saliva revealed the highest significant impact on solubility followed by artificial saliva, sodium chloride, and distilled water. Water absorption increased significantly with storage duration. PEEK showed the lowest solubility and water absorption values. The highest ! ! ! 2! solubility was observed for the conventional polymer CG, and the highest water absorption was found for the composite LU. PMMA-based TC, ZP, CG, and AT showed the lowest HM and indentation modulus, followed by CT, and PEEK. The highest values were ...

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“…The hardness is directly related to wear resistance, as evidenced in the literature, establishing a correlation where the higher the hardness, the lower the surface wear of the composite resin 18,[29][30] . Wear resistance is one of the main properties of a composite and the capability of the material to be suitable for use in areas of masticatory effort depends on it.…”

Section: Resultsmentioning

confidence: 99%

Effect of different post-cure polymerization treatment on composite resin hardness

Dimer

Arossi

Santos

et al. 2015

RGO, Rev. Gaúch. Odontol.

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Objective To evaluate the influence of different additional polymerization methods on the microhardness of two direct composite resins. Methods Direct Composite resins samples (Fill Magic and Opallis) and a Laboratory RESUMOObjetivo Avaliar a influência de diferentes métodos de polimerização complementar na microdureza de duas resinas compostas de uso direto. MétodosAs amostras foram confeccionadas com as resinas FillMagic, Opallis e Ceramage (Resina Composta Laboratorial); e fotopolimerizadas conforme recomendações do fabricante. Em seguida, as resinas de uso direto foram submetidas à polimerização complementar. Os grupos experimentais foram divididos em (n=5): grupo 1: Fotopolimerização convencional; grupo 2: Luz adicional (80s); grupo 3: Autoclave; grupo 4: Resina Laboratorial Ceramage. O ensaio de microdureza Vickers foi realizado após uma semana de armazenagem em água, em invólucros livres de luz, e os resultados foram submetidos à análise estatística ANOVA/Tukey. ResultadosA Ceramage apresentou maior valor de microdureza Vickers, com diferença significativa em relação a todas as outras resinas utilizadas neste estudo (p ≤ 0,05); a FillMagic não apresentou diferença significativa entre seus grupos experimentais e o seu controle (p > 0,05); na Opallis, a autoclave foi único método que apresentou diferença significativa quando comparado ao seu grupo controle (p ≤ 0,05). ConclusãoConclui-se que a dureza de uma resina composta de uso direto testada -a Opallis -foi aumentada pela polimerização complementar em Autoclave, porém, não foi suficiente para atingir a dureza da resina composta laboratorial. Além disso, o aumento no tempo de fotoativação das resinas de uso direto não produz uma superfície de maior dureza. Termos de indexação:Dureza. Temperatura alta. Polimerização. Effect of different post-cure polymerization treatment on composite resin hardnessEfeito de diferentes métodos de polimerização complementar sobre a dureza de resinas compostas

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Influence of artificial saliva on abrasive wear and microhardness of dental composites filled with nanoparticles

Cited by 79 publications

References 31 publications

Changes in surface roughness and color stability of two composites caused by different bleaching agents

Changes in surface roughness and color stability of two composites caused by different bleaching agents

Physicomechanical characterization of polyetheretherketone and current esthetic dental CAD/CAM polymers after aging in different storage media

Effect of different post-cure polymerization treatment on composite resin hardness

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