scholarly journals Influence of nanoparticles on color stability, microhardness, and flexural strength of acrylic resins specific for ocular prosthesis

2014 ◽  
pp. 5779 ◽  
Author(s):  
Marcelo Coelho Goiato ◽  
Agda Marobo Andreotti ◽  
Amália Moreno ◽  
Adhara Smith Nóbrega ◽  
Aldiéris Alves Pesqueira ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Color Stability ◽  
Ocular Prosthesis ◽  
Acrylic Resins

scholarly journals Evaluation of color stability of different temporary restorative materials

2015 ◽  
Vol 44 (5) ◽  
pp. 262-267 ◽  
Author(s):  
José Vitor Quinelli Mazaro ◽  
Luiz Miguel Minani ◽  
Adriana Cristina Zavanelli ◽  
Caroline Cantieri de Mello ◽  
Cleidiel Aparecido Araújo Lemos
Keyword(s):  
Storage Time ◽  
Color Change ◽  
Artificial Saliva ◽  
Color Stability ◽  
Time Interval ◽  
Acrylic Resins ◽  
Significant Difference ◽  
Restorative Materials ◽  
Before And After ◽  
Level Of Significance

AbstractIntroductionTemporary restorative materials are widely used, however, little is know about their color stability.Objectiveto evaluate the color stability of the following temporary restorative materials: acrylic and bis-acrylic resins after immersion in pigmenting solutions for different periods of storage.Material and methodFour materials were tested (Dêncor/Clássico, Protemp 4/3M ESPE; Structur 2 SC/Voco; Luxatemp AM Plus/DMG) and 30 test specimens (15 mm in diameter and 2 mm thick) per material were fabricated. They were divided according to the storage medium (artificial saliva, saliva + cola type soda, and saliva + coffee) and storage time intervals (2, 5, 7 and 15 days). Color measurements were made before and after immersions, with use of a spectrophotometer, by means of the CIE L*a*b* system. The data were analyzed by the analysis of variance and the Tukey Test, at a level of significance of 5%.ResultAcrylic resin presented greater color stability in comparison with bis-acrylic resins (p<0.001). When bis-acrylic resins were compared no significant difference was observed between the resins Structur and Luxatemp (p=0.767). As regards solutions tested, coffee showed the highest color change values (p<0.001), and the longer the storage time interval, the greater was the color change in all the temporary restorative materials analyzed (p<0.001).ConclusionAcrylic resin presented greater color stability in comparison with bis-acrylic resins (p<0.001). Coffee caused the greatest color change, and immersion time was determinant in color stability of the temporary materials analyzed.

scholarly journals Effect of microwave disinfection on physical and mechanical properties of acrylic resins

2008 ◽  
Vol 19 (4) ◽  
pp. 348-353 ◽  
Author(s):  
Rafael Leonardo Xediek Consant ◽  
Erica Brenoe Vieira ◽  
Marcelo Ferraz Mesquita ◽  
Wilson Batista Mendes ◽  
João Neudenir Arioli-Filho
Keyword(s):  
Flexural Strength ◽  
Room Temperature ◽  
Physical And Mechanical Properties ◽  
Hardness Test ◽  
Knoop Hardness ◽  
Microwave Energy ◽  
Bending Test ◽  
Acrylic Resins ◽  
Strength Tests ◽  
The Impact

This study evaluated the effect of microwave energy on the hardness, impact strength and flexural strength of the Clássico, Onda-Cryl and QC-20 acrylic resins. Aluminum die were embedded in metallic or plastic flasks with type III dental stone, in accordance with the traditional packing technique. A mixing powder/liquid ratio was used according to the manufacturer's instructions. After polymerization in water batch at 74ºC for 9 h, boiling water for 20 min or microwave energy at 900 W for 10 min, the specimens were deflasked after flask cooling at room temperature, and submitted to finishing. Specimens non-disinfected and disinfected by microwave irradiation were submitted to hardness, impact and flexural strength tests. Each specimen was immersed in distilled water and disinfected in a microwave oven calibrated to 650 W for 3 min. Knoop hardness test was performed with 25 g load for 10 s, impact test was carried out using the Charpy system with 40 kpcm, and 3-point bending test with a crosshead speed of 0.5 mm/min until fracture. Data were submitted to statistical analysis by ANOVA and Tukey's test (?=0.05). Disinfection by microwave energy decreased the hardness of Clássico and Onda-Cryl acrylic resins, but no effect was observed on the impact and flexural strength of all tested resins.

Effect of disinfection and storage on the flexural strength of ocular prosthetic acrylic resins

Gerodontology ◽  
2011 ◽  
Vol 29 (2) ◽  
pp. e838-e844 ◽  
Author(s):  
Marcelo C. Goiato ◽  
Daniela M. dos Santos ◽  
Amália Moreno ◽  
Mariana G. Iyda ◽  
Maria C. R. A. Rezende ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Acrylic Resins ◽  
And Storage

Effect of pre- and postpolymerization on flexural strength and elastic modulus of impregnated, fiber-reinforced denture base acrylic resins

2008 ◽  
Vol 100 (6) ◽  
pp. 449-457 ◽  
Author(s):  
Luiz E. Bertassoni ◽  
Grayson W. Marshall ◽  
Evelise Machado de Souza ◽  
Rodrigo Nunes Rached
Keyword(s):  
Elastic Modulus ◽  
Flexural Strength ◽  
Fiber Reinforced ◽  
Denture Base ◽  
Acrylic Resins

scholarly journals Assessment of the flexural strength of two heat-curing acrylic resins for artificial eyes

2009 ◽  
Vol 23 (3) ◽  
pp. 263-267 ◽  
Author(s):  
Aline Úrsula Rocha Fernandes ◽  
Aline Portugal ◽  
Letícia Rocha Veloso ◽  
Marcelo Coelho Goiato ◽  
Daniela Micheline dos Santos
Keyword(s):  
Flexural Strength ◽  
Acrylic Resins ◽  
Heat Curing

scholarly journals In vitro analysis of different properties of acrylic resins for ocular prosthesis submitted to accelerated aging with or without photopolymerized glaze

2016 ◽  
Vol 69 ◽  
pp. 995-1003 ◽  
Author(s):  
Daniela Micheline dos Santos ◽  
Bruna Egumi Nagay ◽  
Emily Vivianne Freitas da Silva ◽  
Liliane da Rocha Bonatto ◽  
Mariana Vilela Sonego ◽  
...  
Keyword(s):  
Accelerated Aging ◽  
Ocular Prosthesis ◽  
Acrylic Resins ◽  
Vitro Analysis ◽  
In Vitro Analysis

scholarly journals Color Stability, Surface Roughness and Flexural Strength of an Acrylic Resin Submitted to Simulated Overnight Immersion in Denture Cleansers

2013 ◽  
Vol 24 (2) ◽  
pp. 152-156 ◽  
Author(s):  
Helena de Freitas Oliveira Paranhos ◽  
Amanda Peracini ◽  
Marina Xavier Pisani ◽  
Viviane de Cássia Oliveira ◽  
Raphael Freitas de Souza ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Flexural Strength ◽  
Color Stability ◽  
Acrylic Resin ◽  
National Bureau ◽  
Alkaline Peroxide ◽  
Significant Difference ◽  
Color Data ◽  
Effervescent Tablet ◽  
Denture Cleansers

This study evaluated color stability, surface roughness and flexural strength of acrylic resin specimens after immersion in alkaline peroxide and alkaline hypochlorite, simulating a period of one and a half year of use of overnight immersion. Sixty disc-shaped (16X4 mm) and 80 rectangular specimens (65X10X3.3 mm) were prepared from heat-polymerized acrylic resin (Lucitone 550) and distributed into 4 groups (n=20): C1: without immersion, C2: 8 h immersion in distilled water; AP: 8 h immersion in alkaline peroxide effervescent tablet; SH: 8 h immersion in 0.5% NaOCl solution. Properties were evaluated at baseline and after the immersion. Color data were also calculated according the National Bureau of Standards (NBS). Results were analyzed statistically by ANOVA and Tukey's HSD test (α=0.05). AP (2.34 ± 0.41) caused color alteration significantly higher than C2 (0.39 ± 0.30) and SH (1.73 ± 0.52). The mean ΔE values were classified as indicial for C2 (0.36 ± 0.29) and noticeable for AP (2.12 ± 0.39) and SH (1.59 ± 0.48). SH (0.0195 ± 0.0150) caused significantly higher ΔRa (p=0.000) than the C2 (0.0005 ± 0.0115) and PA (0.0005 ± 0.0157) groups. There was no statistically significant difference (p=0.063) among the solutions for flexural strength (C1: 105.43 ± 14.93, C2: 100.30 ± 12.43, PA: 97.61 ± 11.09, SH: 95.23 ± 10.18). In conclusion, overnight immersion in denture cleansing solutions simulating a year and a half of use did not alter the flexural strength of acrylic resin but caused noticeable color alterations, higher for alkaline peroxide. The 0.5% NaOCl solution caused increase in surface roughness.

scholarly journals Effects of Denture Cleansers on Heat-Polymerized Acrylic Resin: A Five-Year-Simulated Period of Use

2015 ◽  
Vol 26 (4) ◽  
pp. 404-408 ◽  
Author(s):  
Carolina Noronha Ferraz Arruda ◽  
Danilo Balero Sorgini ◽  
Viviane de Cássia Oliveira ◽  
Ana Paula Macedo ◽  
Cláudia Helena Silva Lovato ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Flexural Strength ◽  
Testing Machine ◽  
Color Stability ◽  
Acrylic Resin ◽  
National Bureau ◽  
Alkaline Peroxide ◽  
Significant Difference ◽  
Bonferroni Test ◽  
Clinically Significant

<p>This study evaluated color stability, surface roughness and flexural strength of acrylic resin after immersion in alkaline peroxide and alkaline hypochlorite solutions, simulating a five-year-period of use. Sixty disc-shaped (16x4 mm) and 60 rectangular specimens (65x10x3.3 mm) were prepared from heat-polymerized acrylic resin (Lucitone 550) and assigned to 3 groups (n=20) of immersion (20 min): C1: distilled water; AP: warm water and one alkaline peroxide tablet; SH: 0.5% NaOCl solution. Color data (∆E) were determined by a colorimeter and also quantified according to the National Bureau of Standards units. A rugosimeter was used to measure roughness (μm) and the flexural strength (MPa) was measured using a universal testing machine. Data were evaluated by Kruskal-Wallis followed by Dunn tests (color stability and surface roughness) and by one-way ANOVA and Bonferroni test (flexural strength). For all tests was considered α=0.05. AP {0.79 (0.66;1.42)} caused color alteration significantly higher than C1 {0.45 (0.37;0.57)} and SH {0.34 (0.25;0.42)}. The mean ∆Ε values quantified by NBS were classified as "trace" for C1 (0.43) and SH (0.31) and "slight" for AP (0.96). SH {-0.015 (-0.023;0.003)} caused significantly higher ΔRa than the C1 {0.000 (-0.004;0.010)} and AP {0.000 (-0.009;0.008)} groups. There was no statistically significant difference among the solutions for flexural strength (C1: 84.62±16.00, AP: 85.63±12.99, SH: 84.22±14.72). It was concluded that immersion in alkaline peroxide and NaOCl solutions simulating a five-year of 20 min daily soaking did not cause clinically significant adverse effects on the heat-polymerized acrylic resin.</p>

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