Flexural strength and modulus of autopolimerized poly (methyl methacrylate) with nanosilica

Baloš, Sebastian; Pilić, Branka; Petrovic, Dan; Petronijevic, Branislava; Sarcev, Ivan

doi:10.2298/vsp160203359b

Cited by 6 publications

(13 citation statements)

References 19 publications

(27 reference statements)

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“…In this work, the relatively low TiO2 nanoparticle content was applied. However, in some of our previous publications, which also studied the effect of relatively low SiO2 nanoparticle addition to PMMA [16,30] and flowable dental composite [35], some differences can be observed. Although mechanical properties increase was similar to this study, the maximum strengthening effect was observed at minimal tested nanoparticle loading of 0.05%.…”

Section: Resultsmentioning

confidence: 81%

“…In this paper, TiO2 nanoparticles were applied as a reinforcement for a cold cured poly/methylmethacrylate) denture relines resin, due to the inherent low mechanical properties of this type of polymer when it is cold cured. Namely, this material is used as a denture reline resin and for denture repair [16]. It is provided in the form of powder and liquid.…”

Section: Introductionmentioning

confidence: 99%

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Flexural Modulus and Strength of Cold Cured Poly(methylmethacrylate) Reinforced with TiO2 Nano Particles

Baloš¹,

Šarčev²,

Sarcev³

et al. 2021

Mater. Plast.

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The most significant disadvantage of cold cured poly (methyl methacrylate) - PMMA is its poor mechanical properties, mainly in flexure. The aim of this work is to explore the modulus and flexural strength of modified cold cured PMMA modified with low TiO2 addition, which can also have antibacterial properties. Commercial cold cured PMMA resin, consisting of powder and liquid components, were modified by adding 0.05 %, 0.2 %, and 1.5 wt. % 20 nm hydrophobic TiO2. The specimen s flexural modulus and strength were tested, while heat properties were determined with DSC analysis. SEM and EDX were used to study fracture surfaces of tested specimens. In all modified specimens, an increased flexural modulus and flexural strength were recorded. In all specimens, the appearance of agglomerates was noted. Glass transition temperatures also increased, as the result of the appearance of polymer chains with reduced mobility around nanoparticles. 0.2 % of 20 nm TiO2 nanoparticle content proved to be the most efficient in increasing flexural modulus and strength.

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Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Flexural Modulus and Strength of Cold Cured Poly(methylmethacrylate) Reinforced with TiO2 Nano Particles

Baloš¹,

Šarčev²,

Sarcev³

et al. 2021

Mater. Plast.

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“…This may be due to the existence of submicron and nanoparticle agglomerates. Agglomerates have a relatively low cohesive strength, due to the presence of relatively weak secondary bonds between particles, usually Van der Waals forces, hydrogen or capillary [33][34][35]. By mixing nano and submicron particles, their agglomerates suffer random collisions, as reported by Dongguang et al [36], causing a grinding effect, leading to the obtaining of smaller particles in the coating mixture, as revealed by Zeta sizer, Figure 3.…”

Section: Discussionmentioning

confidence: 99%

“…Agglomerates have a relatively low cohesive strength, due to the presence of relatively weak secondary bonds between particles, usually Van der Waals forces, hydrogen or capillary [33][34][35]. By mixing nano and submicron particles, their agglomerates suffer random collisions, as reported by Frustum-type electrode tip results in a combined concentrated-spread arc, offering a combination of a higher penetration due to the flattened tip and the vaporization, dissociation, and decomposition of the oxides.…”

Section: Discussionmentioning

confidence: 99%

Suppressing the Use of Critical Raw Materials in Joining of AISI 304 Stainless Steel Using Activated Tungsten Inert Gas Welding

Baloš

Dramićanin

Janjatovic

et al. 2019

Metals

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The aim of this study was to study the influence of TiO2 coating for its efficacy during the activated-tungsten inert gas (TIG) welding and to suppress the use of consumables that are rich in critical raw materials. Post-welding penetration depth, particle size distribution, microstructure, and microhardness of welded samples were assessed. Based on these results, it was found that there is no direct correlation between the weld metal surface area and the coating. The particle size in the coating, although, seemed to have played an important role, e.g., nanoparticles resulted in an increased penetration depth and depth/width (D/W) ratio as opposed to the submicron-sized particles. The most optimal welding condition resulted when a mixture of submicron-sized and nanometric-sized particles were used. It was demonstrated by the Zeta analyser results that the micron particles rub the nanoparticles due to mechanical friction resulting in smaller oxide particle formation in the coating. Finally, the presence of Marangoni convection in TIG and reversed Marangoni convection in the activated TIG (A-TIG) process were proven by means of the microstructure analysis and measurement, which were found to be positively correlated.

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“…PMMA is used for denture reline resins as well, but they are cold, rather than hot polymerized. This material is used for providing a better retention of removable protheses in cases of alveolar resorption and denture reparation in case of crack or fracture 13 . The mechanical properties of cold polymerized denture reline resin is lower, as the result of a limited time for mixing the liquid and powder component, after which the radical polymerization commences.…”

Section: Introductionmentioning

confidence: 99%

Autopolymerized poly(methyl methacrylate) reinforced with alumina nanoparticles

et al. 2021

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Background/Aim: Mechanical properties, most significantly flexural strength of cold polymerized acrylic dental materials, used for denture reparation are lower compared to the equivalent hot polymerized materials. This paradox can be rectified by the aplication of alumina nanoparticles, which is the aim of this work. Methods: The liquid component of the commercial autopolimerized denture reline resin was modified with 0.05 %, 0.2 % and 1.5 wt. % 13 nm hydrophobic Al 2 O 3. These mixtures, along with the unmodified liquid, were mixed with the powder component to form test specimens. Flexural modulus and strength were tested, while the results were stastistically evaluated by one way ANOVA analysis followed by Tukey's test. Differential scanning calorimetry, scaning electron microscopy and energy dispersive x-ray analysis analyses were performed to assess the heat and fracture surface features. Results: Statistically significant increase in flexural modulus was obtained only for 0.2 % nanoparticle content, while flexural strength was significantly increased for specimens modified with 0.05 and 0.2 % nanoparticles. The rise of nanoparticle content to 1.5 % contributes to the formation of agglomerates, giving unsatisfactory mechanical properties. Also, the rise in glass transition temperature was noted for the most effective 0.05 and 0.2 % Al 2 O 3 contents. Conclusions: 0.2 % 13 nm Al 2 O 3 loading is the most effective in imropving the tested mechanical properties of cold polimerized poly(methyl methacrylate) reline resin.

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Flexural strength and modulus of autopolimerized poly (methyl methacrylate) with nanosilica

Cited by 6 publications

References 19 publications

Flexural Modulus and Strength of Cold Cured Poly(methylmethacrylate) Reinforced with TiO2 Nano Particles

Flexural Modulus and Strength of Cold Cured Poly(methylmethacrylate) Reinforced with TiO2 Nano Particles

Suppressing the Use of Critical Raw Materials in Joining of AISI 304 Stainless Steel Using Activated Tungsten Inert Gas Welding

Autopolymerized poly(methyl methacrylate) reinforced with alumina nanoparticles

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