Mechanical and Rheological Properties of Flowable Resin Composites Modified with Low Addition of Hydrophilic and Hydrophobic TiO2 Nanoparticles

Šarčev, Branislava Petronijević; Zlatanović, Danka Labus; Hadnadjev, Miroslav; Pilić, Branka; Sarcev, Ivan; Marković, Dubravka; Baloš, Sebastian

doi:10.37358/mp.21.2.5480

Cited by 3 publications

(2 citation statements)

References 32 publications

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“…Light-cured universal composites for direct restorations have undergone substantial improvements over the years [1,2] becoming an established standard of care [3]. The reported annual failure rates of up to 3% [4,5] suggest that light-cured composites are reliable even when placed by inexperienced operators [5,6].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Degree of Conversion on Mechanical Properties and Monomer Elution from Self-, Dual- and Light-Cured Core Composites

et al. 2021

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The objective of this work was to measure and correlate the degree of conversion (DC), mechanical properties and monomer elution from self-, dual- and light-cured core composites. Five samples of each of the following materials were prepared for each test: Clearfil (Core, Photo Core, Automix), Bisco (Core-Flo, Light-Core and Bis-Core). DC was determined using FTIR, compressive and flexural strength and modulus of elasticity using a universal testing machine and microhardness using Vickers hardness. Elution was measured using HPLC. One-way ANOVA with Tukey’s post-test and Pearson’s correlation were used to statistically analyze the data. DC of Clearfil-Dual (70.1%) and Clerafil-Photo (66.8%) were higher than Clearfil-Self (55.4%) and all Bisco materials (51.4–55.3%). Flexural strength of Clearfilwas higher than that of Bisco composites. The Microhardness of Clearfil-Dual (119.8VHN) and Clearfil-Photo (118.0VHN) were higher compared to other materials. The greatest elution was detected from self-cured materials. DC positively correlated to microhardness and compressive/flexural strength and negatively to BisGMA elution. Clearfil-Photo and Automix showed higher conversion, lower monomer elution and, generally, better mechanical properties. Self-cured composites should not be recommended for routine clinical use as their performance was inferior to dual- and light-cured composites. Microhardness may be used as an indicator of elution.

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Section: Introductionmentioning

confidence: 99%

Effect of the Degree of Conversion on Mechanical Properties and Monomer Elution from Self-, Dual- and Light-Cured Core Composites

et al. 2021

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“…After the agglomerate fractures, the stress is shifted to the matrix, whilst the crack propagates to the nearby NPs. Subsequently, the stress in the agglomerates suddenly increases, causing matrix overload and premature failure 38 .…”

Section: Tio2 Npsmentioning

confidence: 99%

Nanotechnology in Pit and Fissure Sealants: A Systematic Review

Aziz,

Muhammad,

Khan

et al. 2024

J Khyber Coll Dent

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Objectives: To conduct a comprehensive analysis of the literature and off er an overview of the effects of various nanoparticles (NPs) in conjunction with pit and fi ssure sealants (PAFs). Materials and Methods: Studies were chosen using an electronic search and evaluated based on key phrases, titles, and abstracts to see if they matched the inclusion criteria. The studies conducted between 2014-2022 were considered. Those articles which focused on the role of nanoparticles in dental sealants, published in English and had open access were studied. According to the research design, copies of all papers were gathered and analyzed for quality. Two databases (Pub Med and Google Scholar) were used. Results: 78 references were obtained, out of which 20 publications were selected after eliminating duplicates and following the exclusion criteria. According to the investigations of this review,modified sealants may have antibacterial action as well as an impact on mechanical properties. Conclusion: Antimicrobial effi ciency can be attributed to pit and fi ssure sealants by incorporating nanomaterials, which might alter their mechanical and fundamental physiochemical propertiesas well.

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Discontinuous Shear Thickening of Suspensions of Magnetic Particles in Relation to the Polymer Coating on Their Surfaces

Bossis,

Volkova,

Grasselli

2024

Colloids and Interfaces

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The phenomenon of discontinuous shear thickening (DST) is observed in suspensions of solid particles with a very high-volume fraction. It is characterized by an abrupt decrease in the shear rate for critical stress during a ramp of stress. This behavior can be reproduced in numerical simulations by introducing a local friction between two particles above a given local force. We present experimental results showing this DST behavior obtained with suspensions of magnetic (iron) and nonmagnetic (calcium carbonate) particles and different amounts of a superplasticizer molecule used in the cement industry. For both types of particles, the same behavior was observed with first an increase in critical stress with the amount of plasticizer followed by a decrease at higher concentrations but with a larger viscosity before critical stress was reached. At a low concentration of plasticizer, the low critical stress is interpreted by the local sliding of plasticizer molecules on the surface of particles. At higher concentrations, when total coverage is achieved, the critical stress is higher since it has to remove the molecules out of the surface. At still higher concentrations, the increase in viscosity is explained by the formation of multilayers of molecules on the surface of the particles. This interpretation is supported by the measurement of the adsorption isotherm of the plasticizer on the surface of the particles.

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Mechanical and Rheological Properties of Flowable Resin Composites Modified with Low Addition of Hydrophilic and Hydrophobic TiO2 Nanoparticles

Cited by 3 publications

References 32 publications

Effect of the Degree of Conversion on Mechanical Properties and Monomer Elution from Self-, Dual- and Light-Cured Core Composites

Effect of the Degree of Conversion on Mechanical Properties and Monomer Elution from Self-, Dual- and Light-Cured Core Composites

Nanotechnology in Pit and Fissure Sealants: A Systematic Review

Discontinuous Shear Thickening of Suspensions of Magnetic Particles in Relation to the Polymer Coating on Their Surfaces

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