The Effect of Cross-linking Agents on the Impact Resistance of a Linear Poly(methyl methacrylate) Denture-base Polymer

1986 ◽  
Vol 65 (7) ◽  
pp. 987-992 ◽  
Author(s):  
C.A. Price
Keyword(s):  
Methyl Methacrylate ◽  
Impact Resistance ◽  
Cross Linking ◽  
Denture Base ◽  
Poly Methyl Methacrylate ◽  
Base Polymer ◽  
Linear Poly ◽  
The Impact

The impact of cross-linking degree on the thermal and texture behavior of poly(methyl methacrylate)

2016 ◽  
Vol 124 (2) ◽  
pp. 709-717 ◽  
Author(s):  
Mahmoud A. Hussein ◽  
Reda M. El-Shishtawy ◽  
Bahaa M. Abu-Zied ◽  
Abdullah M. Asiri
Keyword(s):  
Methyl Methacrylate ◽  
Cross Linking ◽  
Poly Methyl Methacrylate ◽  
The Impact

Physical, mechanical, thermal, and dynamic characterization of carbon nanotubes incorporated poly(methyl methacrylate)-based denture implant

2017 ◽  
Vol 51 (28) ◽  
pp. 3931-3940 ◽  
Author(s):  
Eraj Humayun Mirza ◽  
Aftab Ahmed Khan ◽  
Mohamad Ahmed El-Sharawy ◽  
Abdulaziz Al-Khureif ◽  
Saleh Al-Hijji ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Methyl Methacrylate ◽  
Load Transfer ◽  
Control Group ◽  
Denture Base ◽  
Poly Methyl Methacrylate ◽  
Thermal Changes ◽  
Transfer Capability ◽  
Base Polymer ◽  
Walled Cnts

The objective of this study was targeted to synthesize and characterize a carbon nanotubes (CNTs) incorporated poly(methyl methacrylate) (PMMA)-based denture polymer. Two experimental denture base polymers were fabricated either by incorporating single-walled CNTs (SWCNTs) (SW-group) or multi-walled CNTs (MWCNTs) (MW-group). In both groups, 0.5 wt% of the CNTs were incorporated into MMA monomer. Using a commercially available heat-cured PMMA (Interacryl Hot, Interdent, Opekarniska, Slovenia), a polymer-to-monomer ratio of 3:1 was used to fabricate the specimens (14 × 14 × 3 mm3 in dimensions) of the control group (without CNTs) (C-group) and the experimental groups (either SWCNT–PMMA or MWCNT–PMMA) ( n = 30, N = 90). Physical, mechanical, thermal, and rheological attributes of the tested materials were assessed. The data were statistically analyzed using SPSS version 21.0 (SPSS®, Chicago, IL, USA) and results were explored with one-way ANOVA. Incorporation of CNTs changed the surface morphology and topography of the PMMA specimens. No thermal changes were observed among C-, SW-, and MW-groups. Conversely, the hardness, elastic modulus and wear resistance were improved in both SW-group and MW-group. Additionally, the dynamic mechanical analyzer showed improvement in storage modulus in SW-group, affirming the load transfer capability of SW–PMMA composite. The CNT–PMMA composite might favorably be used as a potential denture base polymer.

Influence of adding poly(vinyl alcohol) fibres to poly(methyl methacrylate) matrix on the fracture behaviour of fibrereinforced composites

e-Polymers ◽  
2005 ◽  
Vol 5 (1) ◽  
Author(s):  
Vladimir Pavelka ◽  
Josef Jancar ◽  
Eva Nezbedova
Keyword(s):  
Methyl Methacrylate ◽  
Vinyl Alcohol ◽  
Fibre Composite ◽  
Impact Resistance ◽  
Charpy Impact ◽  
Critical Stress Intensity Factor ◽  
Poly Vinyl Alcohol ◽  
Special Focus ◽  
Poly Methyl Methacrylate ◽  
The Impact

AbstractThis paper reports on the relationship between structure and mechanical properties of poly(methyl methacrylate) (PMMA) reinforced with randomly oriented short poly(vinyl alcohol) (PVA) fibres. Special focus was on the effect of fibre content on the impact resistance of PMMA/PVA composites. Instrumented Charpy impact tests were carried out to characterize the impact resistance of PMMA/PVA composites. Linear elastics fracture mechanics was used to determine the dynamic critical strain energy release rate (GId) and the critical stress intensity factor (KId). Fracture surfaces were observed using scanning electron microscopy (SEM). Dynamic mechanical analysis was carried out to describe the viscoelastic response of the material. Finally, the behaviour of PMMA/PVA composites was interpreted using current short-fibre composite models. It was shown that a small amount of added PVA fibres (0.42 - 1.68 vol.-%) led to an increase of elastic modulus and yield stress under impact conditions. GId was also slightly increased, but KId remained unchanged. Good agreement was found between SEM observations and fracture toughness measured under impact loading.

Evaluation of Temperature Influence on Tensile Strength and Izod Impact Resistance on Poly Methyl Methacrylate (PMMA)

2020 ◽  
Vol 1012 ◽  
pp. 100-105
Author(s):  
Gilmar Cunha da Silva ◽  
Foluke Salgado de Assis ◽  
Sergio Neves Monteiro ◽  
Verônica Scarpini Candido ◽  
Alisson Clay Rios da Silva
Keyword(s):  
Methyl Methacrylate ◽  
Impact Resistance ◽  
Sem Analysis ◽  
Temperature Influence ◽  
Tempered Glass ◽  
Poly Methyl Methacrylate ◽  
Aggressive Environment ◽  
Izod Impact ◽  
The Impact ◽  
Scanning Electron

The increasing use of poly methyl methacrylate (PMMA), often replacing tempered glass, is a consequence of its high rigidity, practicality, lightness and transparency. However, current manufacturing standards in the polymer industry recommend specific tests on these materials. The present study aims to mechanically test the properties of poly methyl methacrylate (PMMA) material under conditions that simulate a much more aggressive environment than usual. Infrared spectroscopy (FTIR), thermogravimetric (TG/DTG) tests, Izod impact tests, and scanning electron microscopy (SEM) analysis were performed. The results showed that poly (methyl methacrylate) (PMMA) maintained its tensile mechanical properties up to 105°C. Regarding the impact tenacity, the temperature negatively influenced the performance of this polymer.

Poly(methyl methacrylate) denture base composites enhancement by various combinations of nitrile butadiene rubber/treated ceramic fillers

2015 ◽  
Vol 30 (8) ◽  
pp. 1069-1090 ◽  
Author(s):  
AO Alhareb ◽  
HBM Akil ◽  
ZAB Ahmad
Keyword(s):  
Methyl Methacrylate ◽  
Base Material ◽  
Butadiene Rubber ◽  
Stabilized Zirconia ◽  
Denture Base ◽  
X Ray ◽  
Poly Methyl Methacrylate ◽  
Nitrile Butadiene Rubber ◽  
Ceramic Fillers ◽  
The Impact

Nitrile butadiene rubber (NBR) particles as impact modifier mixed with treated ceramic fillers (aluminum oxide, yttria-stabilized zirconia, and silicon dioxide) were used to reinforce poly(methyl methacrylate) (PMMA) denture base material. The powder components are PMMA, benzoyl peroxide, NBR (5, 7.5, and 10 wt%), and ceramic fillers (5 wt%) treated with silane. The liquid components are 90% methyl methacrylate and 10% ethylene glycol dimethacryate. Fourier transform infrared spectroscopy and energy dispersive X-ray spectroscopy analyses confirmed that the ceramic fillers were successful. The morphology of fracture surfaces of specimens was characterized using field emission scanning electron microscopy. The impact strength (IS) and fracture toughness ( KIC) improved significantly. IS increased to 56% (8.26 kJ m−2) and 73% (2.77 MPa m1/2) for KIC when compared with unreinforced PMMA matrix. Statistical analyses of data results were significantly improved ( p < 0.005). PMMA denture base reinforced by NBR particles mixed with treated ceramic fillers are ideally suited for dentistry applications with the ability to withstand high mastication forces.

scholarly journals Removable partial or complete dentures exposed to beverages and mouthwashes: evaluation of microhardness and roughness

2015 ◽  
Vol 44 (4) ◽  
pp. 189-194 ◽  
Author(s):  
Fernanda Alves Feitosa ◽  
Mateus Guimarães Lage Reggiani ◽  
Rodrigo Máximo de Araújo
Keyword(s):  
Methyl Methacrylate ◽  
Artificial Saliva ◽  
Soft Drink ◽  
Initial Period ◽  
Lemon Juice ◽  
Chlorhexidine Gluconate ◽  
Denture Base ◽  
Mean Values ◽  
Poly Methyl Methacrylate ◽  
The Mean

<title>Abstract</title><sec><title>Purpose</title><p>To evaluate microhardness and roughness of denture base polymethylmethacrylate resinn exposed to acid beverages and mouthwashes.</p></sec><sec><title>Material and method</title><p>Rectangular samples (n=80) were prepared from poly (methyl methacrylate) (PMMA). They were divided into 8 groups and had the initial microhardness and Knoop roughness measured. Samples of each group were immersed for 10 min into a test solution (coffee, lemon juice, chlorhexidine gluconate, red wine, cola-based soft drink, vinegar or antiseptic with and without alcohol) and after stored in artificial saliva for 23 h and 50 min, completing a period of 24 h. This procedure was performed for 14 consecutive days and after this period the microhardness and surface roughness measurements were made again. Data were statistically analyzed using ANOVA non parametric, Kruskal-Walis and the Dunn´s test for microhardness and the t-Student and ANOVA for roughness.</p></sec><sec><title>Result</title><p>For microhardness there were found statistically significant differences among the chlorhexidine gluconate solution, antiseptic without alcohol and cola-based soft drink. For roughness was observed that the mean values between the initial period and after immersion in the test products differed statistically in all groups, without difference among groups.</p></sec><sec><title>Conclusion</title><p>The microhardness of poly(methyl methacrylate) was affected by continue exposition to chlorhexidine gluconate, antiseptic without alcohol and cola-based soft drink. The roughness of poly(methyl methacrylate) is negatively influenced by the exposure to all tested products. It may be concluded that both, microhardness and roughness, were affected by the treatments.</p></sec>

scholarly journals Heat-cured poly(methyl methacrylate) resin incorporated with different food preservatives as an anti-microbial denture base material

2020 ◽  
Author(s):  
Montri Ratanajanchai ◽  
Widchaya Kanchanavasita ◽  
Kallaya Suputtamongkol ◽  
Amonrat Wonglamsam ◽  
Sirinporn Thamapipol ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Base Material ◽  
Food Preservatives ◽  
Denture Base ◽  
Poly Methyl Methacrylate

Effect of poly (methyl methacrylate)-grafted-talc content on mechanical properties and thermal degradation of poly (vinyl chloride) composites

2012 ◽  
Vol 32 (4-5) ◽  
pp. 275-282 ◽  
Author(s):  
Azman Hassan ◽  
Noor Izyan Syazana Mohd Yusoff ◽  
Aznizam Abu Bakar
Keyword(s):  
Mechanical Properties ◽  
Methyl Methacrylate ◽  
Vinyl Chloride ◽  
Flexural Modulus ◽  
Nitrogen Atmosphere ◽  
Radical Initiation ◽  
Poly Methyl Methacrylate ◽  
Poly Vinyl Chloride ◽  
Free Radical Initiation ◽  
The Impact

Abstract The influence of talc and poly (methyl methacrylate) (PMMA)-grafted (g)-talc on the mechanical properties of poly (vinyl chloride) (PVC) was investigated. The graft copolymerization was carried out under nitrogen atmosphere, using the free radical initiation technique. The blend formulations were first dry blended using a mixer before being milled into sheets on a two-roll mill at 165°C, and then hot pressed into composites at 190°C. The flexural modulus of both composites increased with increasing filler content from 0 to 20 part per hundred resin (phr), however the increment of grafted (57.7%) was higher than ungrafted composites (48.5%). A similar trend has also been observed for thermal stability. The impact strength of grafted was increased by 45.82%, whereas 18.96% in reduction was observed for the ungrafted composites. The decrement of flexural strength by 16.6% and 21.1% of grafted and ungrafted, respectively, has also shown the improvement in mechanical properties of grafted composites.

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