Evaluation of Color Change of Heat Cured Denture Base Material Incorporated with Novel Silver Nanoparticles Submitted to Accelerated Aging

Poly methyl methacrylate (PMMA) is one of the most widely used materials in modern prosthodontics. It is widely known due to its simplicity in use and acceptable aesthetic. A new concept of polymerization fluid resin technique was instead of heat and gypsum material. Forty specimens were prepared from two brands of fluid acrylic resin. The samples were divided into two groups, the first one was the control while the other group was incorporated with silver nanoparticles(modified). The tests performed were impact strength, transverse strength, color stability and candida retention ability on the samples. 10 samples for each test were used. The results showed that modified group had significantly higher impact strength than the control group. There was non-significant difference between group of modified fluid acrylic and control group. Regarding color stability, there were highly significant color change after 10 days of immersion in the tea solution for the modified group the results of the biological test showed that the candida retention of the control group was significantly higher than modified group. Within the limitation of this study it can be concluded that addition of silver nanoparticles has resulted in significant difference between control and modified group for impact strength test. While non-significant difference was seen for transverse strength test. In regard to color stability, showed enhancement in color stability for both before and after placement in tea solution. Addition of silver nanoparticles also caused reduction in candida albicans retention in the added samples.

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Silver Nanoparticles in Denture Base Material

International Journal of Preventive and Clinical Dental Research ◽

10.5005/jp-journals-10052-0059 ◽

2016 ◽

Vol 3 (4) ◽

pp. 267-270 ◽

Cited By ~ 2

Author(s):

Rajeev Srivastava ◽

Vivek Sharma ◽

Akshay Dave ◽

Manoj Upadhyay

Keyword(s):

Silver Nanoparticles ◽

Base Material ◽

Denture Base

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In Vitro Evaluation of Candida albicans Biofilm Formation on Denture Base PMMA Resin Incorporated with Silver Nanoparticles and its Effect on Flexural Strength

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.905.51 ◽

2014 ◽

Vol 905 ◽

pp. 51-55 ◽

Cited By ~ 1

Author(s):

Sahana Bajracharya ◽

Sroisiri Thaweboon ◽

Boonyanit Thaweboon ◽

Amornrat Wonglamsam ◽

Theerathavaj Srithavaj

Keyword(s):

Silver Nanoparticles ◽

Flexural Strength ◽

Biofilm Formation ◽

Base Material ◽

Bending Test ◽

Yeast Nitrogen Base ◽

Nitrogen Base ◽

Denture Base ◽

Pmma Resin

The aim of this study is to investigate the candidal biofilm formation on the silver nanoparticles (AgNPs) incorporated denture base heat-polymerized (poly methyl methacrylate), PMMA, resinand its flexural strength.Materials and methods:A total of 36PMMA resin specimens (15×15×2 mm3) were fabricated and divided into 4 groups based on their AgNPs contents (0%,0.5%, 1% and 1.5% w/w of polymer). The biofilm of clinical and reference strainsof C.albicanswere grown on PMMA resin specimens in the presence of yeast nitrogen base broth supplemented with 100 mM glucose at 37oC for 48 h and evaluated by tetrazolium reduction assay. The flexural strength of PMMA resin specimens (65×10×3.3 mm3) were tested by using three-point bending test. Data were analyzed by Kruskal-Wallis and Mann-Whitney U test at p<0.05. result:all="" 3="" groups="" with="" agnps="" showed="" significant="" reduction="" in="" biofilm="" formation="" of="" both="" strains="" i="">C.albicans compared to control (0% AgNPs) (p<0.05). Decreased flexural strength was observed with AgNPs groups compared with the control but within acceptable limit of ISO 20795-1. Conclusion:The reduction of the C. albicans biofilm was observed on the heat-polymerized PMMA resin incorporated with AgNPs. Regarding the flexural strength, the values were within ISO limit. These modified PMMA resin can be developed for the prevention or treatment of the candidal infection associated with the denture base material.

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The effect of the accelerated aging on the mechanical properties of the PMMA denture base materials modified with itaconates

Hemijska industrija ◽

10.2298/hemind110727070s ◽

2011 ◽

Vol 65 (6) ◽

pp. 707-715 ◽

Cited By ~ 1

Author(s):

Pavle Spasojevic ◽

Milorad Zrilic ◽

Dragoslav Stamenkovic ◽

Sava Velickovic

Keyword(s):

Tensile Strength ◽

Impact Strength ◽

Testing Machine ◽

Base Material ◽

Accelerated Aging ◽

Charpy Impact ◽

Accelerated Ageing ◽

Denture Base ◽

Elongation At Break ◽

Charpy Impact Strength

This study evaluated the effect of accelerated ageing on the tensile strength, elongation at break, hardness and Charpy impact strength in commercial PMMA denture base material modified with di-methyl itaconate (DMI) and di-n-butyl itaconate (DBI). The samples were prepared by modifying commercial formulation by addition of itaconates in the amounts of 2.5, 5, 7.5 and 10% by weight. After polymerization samples were characterized by FT-IR and DSC analysis while residual monomer content was determined by HPLC-UV. Accelerated ageing was performed at 70?C in water for periods of 7, 15 and 30 days. Tensile measurements were performed using Instron testing machine while the hardness of the polymerized samples was measured by Shore D method. The addition of itaconate significantly reduces the residual MMA. Even at the small amounts of added itaconates (2.5%) the residual MMA content was reduced by 50%. The increase of itaconate content in the system leads to the decrease of residual MMA. It has been found that the addition of di-n-alkyl itaconates decreases the tensile strength, hardness and Charpy impact strength and increases elongation at break. Samples modified with DMI had higher values of tensile strength, hardness and Charpy impact strength compared to the ones modified with DBI. This is explained by the fact that DBI has longer side chain compared to DMI. After accelerated ageing during a 30 days period the tensile strength decreased for all the investigated samples. The addition of DMI had no effect on the material ageing and the values for the tensile strength of all of the investigated samples decreased around 20%, while for the samples modified with DBI, the increase of the amount of DBI in the polymerized material leads to the higher decrease of the tensile strength after the complete accelerated ageing period od 30 days, aulthough after the first seven days of the accelerated ageing the values of hardness have increased for all of the investigated samples. Such behavior is explained as the result of the polymer chain relaxation. The values of Charpy impact strength decreased after accelerated ageing. The amount of added DMI have no affect on the decrease of Charpy impact strength after accelerated ageing, the decrease was similar as for pure PMMA. The decrease of Charpy impact strength increased as the amount of added DBI increases.

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Evaluation the tensile strength of cold-cured acrylic resin denture base material by adding silver nanoparticles

Indian Journal of Public Health Research & Development ◽

10.5958/0976-5506.2018.01258.5 ◽

2018 ◽

Vol 9 (10) ◽

pp. 917 ◽

Cited By ~ 1

Author(s):

Ali Mohammad Ali Aljafery ◽

Aayad sayhood ◽

Wasna'a M. Abdulridha ◽

Ahmed Muhsin Yousif

Keyword(s):

Silver Nanoparticles ◽

Tensile Strength ◽

Base Material ◽

Acrylic Resin ◽

Denture Base

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Effect of silver nanoparticles incorporation on viscoelastic properties of acrylic resin denture base material

European Journal of Dentistry ◽

10.4103/1305-7456.156821 ◽

2015 ◽

Vol 09 (02) ◽

pp. 207-212 ◽

Cited By ~ 6

Author(s):

Hamada Zaki Mahross ◽

Kusai Baroudi

Keyword(s):

Silver Nanoparticles ◽

Storage Modulus ◽

Loss Tangent ◽

Viscoelastic Properties ◽

Base Material ◽

Acrylic Resin ◽

Material Testing ◽

Control Group ◽

Denture Base ◽

Tan Δ

ABSTRACT Objective: The objective was to investigate the effect of silver nanoparticles (AgNPs) incorporation on viscoelastic properties of acrylic resin denture base material. Materials and Methods: A total of 20 specimens (60 × 10 × 2 mm) of heat cured acrylic resin were constructed and divided into four groups (five for each), according to the concentration of AgNPs (1%, 2%, and 5% vol.) which incorporated into the liquid of acrylic resin material and one group without additives (control group). The dynamic viscoelastic test for the test specimens was performed using the computerized material testing system. The resulting deflection curves were analyzed by material testing software NEXYGEN MT. Results: The 5% nanoparticles of silver (NAg) had significantly highest mean storage modulus E’ and loss tangent Tan δ values followed by 2% NAg (P < 0.05). For 1% nanosilver incorporation (group B), there were no statistically significant differences in storage modulus E’, lost modulus E” or loss tangent Tan δ with other groups (P > 0.05). Conclusion: The AgNPs incorporation within the acrylic denture base material can improve its viscoelastic properties.

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Assessment of Color Stability of Treated Leathers with Silicone Oil and Polyethylene Glycol

Journal of African Leather and Leather Products Advances ◽

10.15677/jallpa.2014.v1i1.8 ◽

2014 ◽

Vol 1 (1) ◽

pp. 24-34

Author(s):

Alireza K. ◽

Hossein Ahmadi ◽

Mohsen Mohammadi

Keyword(s):

Ascorbic Acid ◽

Polyethylene Glycol ◽

Treatment Process ◽

Color Change ◽

Silicone Oil ◽

Accelerated Aging ◽

Color Stability ◽

Antioxidant Additive ◽

Before And After ◽

Aesthetic Values

Lubricants and leather dressings are the most common treatments of dry and water logged historical leathers. Color change has a great importance during the time and treatment process, due to visual and aesthetic values of historic leather relics. Polyethylene glycol (PEG) and silicone oil (SiO) are frequently used leather dressings in the conservation procedures. Therefore, color stability of treated leathers with PEG and SiO were investigated before and after heat accelerated aging. Moreover, application of ascorbic acid was evaluated as an antioxidant additive for PEG (PEG+AA).Color change after treatment and aging were studied by colorimetry technique in the CIE *L*a*b system. Results indicated to severe color alteration in PEG treated and aged leathers with or without ascorbic acid. Whereas, SiO treated samples showed better stability and minimum color shift after aging. Silicone oil was characterized as the best dressing for historical leathers with compared to PEG and PEG+AA, due to its high stability and aesthetical properties.

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Efficacy of Silver Nanoparticles Synthesized from Hymenocallis species (Spider Lilly) Leaf Extract as Antimicrobial Agents

International Journal of Pharmaceutical Sciences and Nanotechnology ◽

10.37285/ijpsn.2019.12.5.4 ◽

2019 ◽

Vol 12 (5) ◽

pp. 4644-4647

Author(s):

K.K. Gupta ◽

Neha Kumari ◽

Neha Sinha ◽

Akruti Gupta

Keyword(s):

Silver Nanoparticles ◽

Leaf Extract ◽

Antimicrobial Agents ◽

Color Change ◽

Bacterial Species ◽

Antimicrobial Property ◽

Biogenic Synthesis ◽

E Coli ◽

Light Yellow ◽

Antibiotic Property

Biogenic synthesis of silver nanoparticles synthesized from Hymenocallis species (Spider Lilly) leaf extract was subjected for investigation of its antimicrobial property against four bacterial species (E. coli, Salmonella sp., Streptococcus sp. & Staphylococcus sp.). The results revealed that synthesized nanoparticles solution very much justify the color change property from initial light yellow to final reddish brown during the synthesis producing a characteristics absorption peak in the range of 434-466 nm. As antimicrobial agents, their efficacy was evaluated by analysis of variance in between the species and among the different concentration of AgNPs solution, which clearly showed that there was significant variation in the antibiotic property between the four different concentrations of AgNPs solution and also among four different species of bacteria taken under studies. However, silver nanoparticles solution of 1: 9 and 1:4 were proved comparatively more efficient as antimicrobial agents against four species of bacteria.

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