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      Hybrid denture acrylic composites with nanozirconia and electrospun polystyrene fibers

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          Abstract

          The processing and characterization of hybrid PMMA resin composites with nano-zirconia (ZrO 2) and electrospun polystyrene (PS) polymer fibers were presented in this study. Reinforcement was selected with the intention to tune the physical and mechanical properties of the hybrid composite. Surface modification of inorganic particles was performed in order to improve the adhesion of reinforcement to the matrix. Fourier transform infrared spectroscopy (FTIR) provided successful modification of zirconia nanoparticles with 3-Methacryloxypropyltrimethoxysilane (MEMO) and bonding improvement between incompatible inorganic nanoparticles and PMMA matrix. Considerable deagglomeration of nanoparticles in the matrix occurred after the modification has been revealed by scanning electron microscopy (SEM). Microhardness increased with the concentration of modified nanoparticles, while the fibers were the modifier that lowers hardness and promotes toughness of hybrid composites. Impact test displayed increased absorbed energy after the PS electrospun fibers had been embedded. The optimized composition of the hybrid was determined and a good balance of thermal and mechanical properties was achieved.

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          PMMA denture base material enhancement: a review of fiber, filler, and nanofiller addition

          Mohammed Gad, Shaimaa M. Fouda, Fahad Al-Harbi … (2017)
          This paper reviews acrylic denture base resin enhancement during the past few decades. Specific attention is given to the effect of fiber, filler, and nanofiller addition on poly(methyl methacrylate) (PMMA) properties. The review is based on scientific reviews, papers, and abstracts, as well as studies concerning the effect of additives, fibers, fillers, and reinforcement materials on PMMA, published between 1974 and 2016. Many studies have reported improvement of PMMA denture base material with the addition of fillers, fibers, nanofiller, and hybrid reinforcement. However, most of the studies were limited to in vitro investigations without bioactivity and clinical implications. Considering the findings of the review, there is no ideal denture base material, but the properties of PMMA could be improved with some modifications, especially with silanized nanoparticle addition and a hybrid reinforcement system.
          Article 0 comments Cited 91 times – based on 0 reviews     Review now
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            Polymerization shrinkage and elasticity of flowable composites and filled adhesives.

            R. Labella, P Lambrechts, B Van Meerbeek … (1999)
            The magnitude and kinetics of polymerization shrinkage, together with elastic modulus, may be potential predictors of bond failure of adhesive restorations. This study examined these properties in visible-light-cured resins, in particular new flowable composites and filled adhesives. Polymerization shrinkage values were obtained by digital video imaging before and after light-curing; shrinkage kinetics were obtained by the "deflecting disk" method and the elastic modulus by analysis of the fundamental period of vibration. Flowable composites generally showed higher shrinkage than traditional non-flowable composites, while more densely filled adhesives presented lower shrinkage than lightly filled or unfilled resins. The elastic moduli of flowable composites were in the low-medium range, whilst the hybrid composites showed the highest values and the microfilled the lowest. More densely filled adhesives were more rigid than lightly filled and unfilled adhesives. The kinetics behavior was material dependent, mainly characterized by the coefficient of near-linear contraction between 10 and 40% of the final shrinkage and the time to reach 75% of the final shrinkage. The higher shrinkage of flowable composites over that of hybrids may indicate a potential for higher interfacial stresses. However, their lower rigidity may be a counteracting factor. The microfilled composite showed low shrinkage and low rigidity, a combination that may prove less damaging to the interface. As the kinetics parameters tended to be material specific, no specific class of materials should be seen as more stress inducing until studies determine the relative importance of each examined parameter. The performance of adhesive resins as stress buffers also remains unpredictable.
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              Denture fracture--a survey.

              R Huggett, U R Darbar, Ben J. Harrison (1994)
              The fracture of dentures is an unresolved problem. Despite increasing costs incurred by the nation on the repair of these prostheses, very little has been documented on the type of fracture encountered. This survey was carried out to determine the prevalence of type of fracture by the distribution of questionnaires to three different laboratories. Results obtained showed that 33% of the repairs carried out were due to debonded/detached teeth. Twenty-nine per cent were repairs to midline fractures, more commonly seen in upper complete dentures. The remaining 38% were other types of fractures, the majority of which constituted repairs to upper partial dentures. The latter involved detachment of acrylic resin saddles from the metal in metal based dentures and the fractures of connectors in the all-acrylic resin partial dentures.
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                Author and article information

                Contributors
                A. A. Elmadani: Role: InvestigationRole: Writing – original draft
                I. Radović: Role: Methodology
                N. Z. Tomić:
                ORCID: http://orcid.org/0000-0002-5215-3338
                Role: Data curation
                M. Petrović: Role: Formal analysis
                D. B. Stojanović: Role: Validation
                R. Jančić Heinemann: Role: Visualization
                V. Radojević: Role: Supervision
                Yogendra Kumar Mishra: Role: Editor
                Journal
                Journal ID (nlm-ta): PLoS One
                Journal ID (iso-abbrev): PLoS ONE
                Journal ID (publisher-id): plos
                Journal ID (pmc): plosone
                Title: PLoS ONE
                Publisher: Public Library of Science (San Francisco, CA USA )
                ISSN (Electronic): 1932-6203
                Publication date (Electronic): 18 December 2019
                Publication date Collection: 2019
                Volume: 14
                Issue: 12
                Electronic Location Identifier: e0226528
                Affiliations
                [1 ] University of Belgrade, Faculty of Technology and Metallurgy, Belgrade, Serbia
                [2 ] University of Belgrade, Laboratory for Materials Sciences, Institute of Nuclear Sciences ‘‘Vinča”, Belgrade, Serbia
                [3 ] Innovation Center of Faculty of Technology and Metallurgy in Belgrade, Belgrade, Serbia
                Institute of Materials Science, GERMANY
                Author notes

                Competing Interests: The authors have declared that no competing interests exist.

                Author information
                http://orcid.org/0000-0002-5215-3338
                Article
                Publisher ID: PONE-D-19-20656
                DOI: 10.1371/journal.pone.0226528
                PMC ID: 6919599
                PubMed ID: 31851701
                SO-VID: 17a13066-a15b-46c2-b157-d261031ad739
                Copyright © © 2019 Elmadani et al
                License:

                This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                History
                Date received : 22 July 2019
                Date accepted : 29 November 2019
                Page count
                Figures: 8, Tables: 5, Pages: 18
                Funding
                The authors received no specific funding for this work.
                Categories
                Subject: Research Article
                Subject: Engineering and Technology
                Subject: Nanotechnology
                Subject: Nanoparticles
                Subject: Physical Sciences
                Subject: Chemistry
                Subject: Polymer Chemistry
                Subject: Macromolecules
                Subject: Polymers
                Subject: Physical Sciences
                Subject: Materials Science
                Subject: Materials
                Subject: Polymers
                Subject: Physical Sciences
                Subject: Chemistry
                Subject: Polymer Chemistry
                Subject: Polymers
                Subject: Physical Sciences
                Subject: Materials Science
                Subject: Materials
                Subject: Fibers
                Subject: Physical Sciences
                Subject: Materials Science
                Subject: Materials
                Subject: Nanomaterials
                Subject: Engineering and Technology
                Subject: Nanotechnology
                Subject: Nanomaterials
                Subject: Research and Analysis Methods
                Subject: Microscopy
                Subject: Electron Microscopy
                Subject: Scanning Electron Microscopy
                Subject: Physical Sciences
                Subject: Materials Science
                Subject: Material Properties
                Subject: Mechanical Properties
                Subject: Physical Sciences
                Subject: Chemistry
                Subject: Polymer Chemistry
                Subject: Macromolecules
                Subject: Polymers
                Subject: Acrylics
                Subject: Physical Sciences
                Subject: Materials Science
                Subject: Materials
                Subject: Polymers
                Subject: Acrylics
                Subject: Physical Sciences
                Subject: Chemistry
                Subject: Polymer Chemistry
                Subject: Polymers
                Subject: Acrylics
                Subject: Physical Sciences
                Subject: Materials Science
                Subject: Materials
                Subject: Composite Materials
                Custom metadata
                Data Availability All relevant data are within the manuscript.

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