scholarly journals Effect of Low Nanodiamond Concentrations and Polymerization Techniques on Physical Properties and Antifungal Activities of Denture Base Resin

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4331
Author(s):  
Shaimaa M. Fouda ◽  
Mohammed M. Gad ◽  
Passent Ellakany ◽  
Maram A. Al Ghamdi ◽  
Soban Q. Khan ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Candida Albicans ◽  
Pairwise Comparison ◽  
Denture Base ◽  
Antifungal Activities ◽  
Nd Addition ◽  
Base Resin ◽  
The Impact ◽  
Denture Base Resin

Background: Denture base resin has some drawbacks. This study investigated the impact of nanodiamonds (ND) and autoclave polymerization on the surface characteristics, translucency, and Candida albicans adherence in polymethyl methacrylate (PMMA) denture base resin after thermocycling. Methods: Heat-polymerized PMMA discs (15 × 2 mm) with a total sample size n = 160 were studied. Specimens were categorized into two main groups (N = 80): conventional water-bath-polymerized PMMA (CP/PMMA) and autoclave-polymerized PMMA (AP/PMMA). Each group was subdivided according to the ND concentration into four groups (n = 20): unmodified PMMA as a control, and 0.1%, 0.25%, and 0.5% ND–PMMA. Scanning electron microscopy (SEM) was used to inspect the morphology of the ND and the ND–PMMA mixtures before heat polymerization. The specimens were exposed to thermal cycling (5000 cycles at 5 and 55 °C), then surface roughness was measured with a non-contact optical interferometric profilometer, contact angle with an automated goniometer, and translucency using a spectrophotometer. Colony-forming units (CFU) were used to determine the adherence of Candida albicans cells to the specimens. ANOVA and Tukey post hoc tests for pairwise comparison were utilized for the statistical analysis (α = 0.05). Results: Surface roughness was significantly reduced with ND addition to CP/PMMA (p ˂ 0.001), while the reduction was not statistically significant in AP/PMMA (p = 0.831). The addition of ND significantly reduced the contact angle, translucency, and Candida albicans count of CP/PMMA and AP/PMMA (p ˂ 0.001). The incorporation of ND in conjunction with autoclave polymerization of PMMA showed significant reduction in all tested properties (surface roughness, contact angle and Candida albicans adherence) except translucency (p = 0.726). Conclusions: ND addition to PMMA and autoclave polymerization improved the surface properties with respect to antifungal activities, while the translucency was adversely affected.

Microbicidal effect of 405-nm blue LED light on Candida albicans and Streptococcus mutans dual-species biofilms on denture base resin

2021 ◽  
Author(s):  
Chiaki Tsutsumi-Arai ◽  
Yuki Arai ◽  
Chika Terada-Ito ◽  
Takahiro Imamura ◽  
Seiko Tatehara ◽  
...  
Keyword(s):  
Candida Albicans ◽  
Streptococcus Mutans ◽  
Denture Base ◽  
Blue Led ◽  
Led Light ◽  
Base Resin ◽  
Denture Base Resin

Effect of different periods of preconditioning with saliva on Candida albicans adhesion to a denture base resin by crystal violet staining and XTT assay

2010 ◽  
Vol 1 (2) ◽  
pp. 114-119 ◽  
Author(s):  
Camila Andrade Zamperini ◽  
Patrícia Cristiane dos Santos Schiavinato ◽  
Ana Lucia Machado ◽  
Eunice Teresinha Giampaolo ◽  
Ana Claudia Pavarina ◽  
...  
Keyword(s):  
Candida Albicans ◽  
Crystal Violet ◽  
Crystal Violet Staining ◽  
Xtt Assay ◽  
Denture Base ◽  
Base Resin ◽  
Denture Base Resin

scholarly journals Color Stability and Surface Properties of PMMA/ZrO2 Nanocomposite Denture Base Material after Using Denture Cleanser

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Mohammed M. Gad ◽  
Reem Abualsaud ◽  
Shaimaa M. Fouda ◽  
Ahmed Rahoma ◽  
Ahmad M. Al-Thobity ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Adverse Effects ◽  
Base Material ◽  
Color Stability ◽  
Zro2 Nanoparticles ◽  
Distilled Water ◽  
Denture Base ◽  
Base Resin ◽  
Denture Cleansers ◽  
Denture Base Resin

Statement of Problem. Novel polymethyl methacrylate (PMMA) containing zirconium dioxide nanoparticles (nano-ZrO2) was suggested as a denture base material but there is a lack of information regarding denture cleanser effects. Objectives. This study aimed to evaluate denture cleanser effects on color stability, surface roughness, and hardness of PMMA denture base resin reinforced with nano-ZrO2. Materials and Methods. A total of 420 specimens were fabricated of unreinforced and nano-ZrO2 reinforced acrylic resin at 2.5% and 5%, resulting in 3 main groups. These groups were further subdivided (n = 10) according to immersion solution (distilled water, Corega, sodium hypochlorite, and Renew) and immersion duration. Surface roughness, hardness, and color were measured at baseline (2 days-T0) in distilled water and then after 180 and 365 days of immersion (T1 & T2) in water or denture cleansing solutions. Data was collected and analyzed using two-way ANOVA followed by Bonferroni post hoc test (α = 0.05). Results. Surface roughness increased significantly after denture cleanser immersion of unmodified and nano-ZrO2-modified PMMA materials while hardness decreased ( P < 0.001 ). The denture cleansers significantly affected the color of both PMMA denture bases ( P < 0.001 ). The immersion time in denture cleansers significantly affected all tested properties ( P < 0.001 ). Within denture cleansers, NaOCl showed the highest adverse effects ( P < 0.05 ) while Renew showed the least adverse effects. Conclusion. Denture cleansers can significantly result in color change and alter the surface roughness and hardness of denture base resin even with ZrO2 nanoparticles addition. Therefore, they should be carefully used.

scholarly journals The Impact of Polymerization Technique and Glass-Fiber Reinforcement on the Flexural Properties of Denture Base Resin Material

2020 ◽  
Vol 14 (01) ◽  
pp. 092-099 ◽  
Author(s):  
Ahmad M. Al-Thobity
Keyword(s):  
Elastic Modulus ◽  
Flexural Strength ◽  
Glass Fiber ◽  
Fiber Reinforcement ◽  
Denture Base ◽  
Long Cycle ◽  
Base Resin ◽  
Glass Fiber Reinforcement ◽  
The Impact ◽  
Denture Base Resin

Abstract Objective Different polymerization and reinforcement techniques have been tested to enhance the mechanical characteristics of denture base acrylic resins. The goal of the present study was to evaluate the influence of autoclave polymerization techniques with glass fiber reinforcement on the flexural strength and elastic modulus of polymethyl methacrylate denture base resins. Materials and Methods Ninety specimens were fabricated from heat-polymerized acrylic resin and randomly distributed depending on the polymerization technique into three groups (n = 30): water bath polymerization, short-cycle autoclave polymerization, and long-cycle autoclave polymerization. Each group was further divided into three subgroups (n = 10) based on the concentration of glass fiber 0, 2.5, and 5wt%. The flexural strength and elastic modulus were investigated using a universal testing machine. One-way ANOVA and Tukey’s post hoc test were performed to analyze the results (α = 0.05). Results The flexural strength and elastic modulus values were significantly higher in 5wt% glass fiber reinforced long-cycle autoclave group in comparison with the other test groups (p < 0.05). Conclusions The long-cycle autoclave polymerization technique with the glass fiber reinforcement significantly increased the flexural strength and elastic modulus of the denture base resin material.

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