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Article

Dental Adhesive Interfaces Reinforced with Magnetic Nanoparticles: Evaluation and Modeling with Micro-CT versus Optical Microscopy

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School of Dental Medicine, “Victor Babes” University of Medicine and Pharmacy of Timisoara, 300070 Timisoara, Romania
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3OM Optomechatronics Group, Faculty of Engineering, “Aurel Vlaicu” University of Arad, 310130 Arad, Romania
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Doctoral School, Polytechnic University of Timisoara, 300222 Timisoara, Romania
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Centre for Fundamental and Advanced Technical Research, Laboratory of Magnetic Fluids, Romanian Academy—Timisoara Branch, 300223 Timisoara, Romania
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National Institute for Research and Development of Isotopic and Molecular Technologies, 400293 Cluj-Napoca, Romania
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Faculty of Physics, West University of Timisoara, 300223 Timisoara, Romania
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(18), 3908; https://doi.org/10.3390/ma13183908
Received: 3 August 2020 / Revised: 27 August 2020 / Accepted: 28 August 2020 / Published: 4 September 2020
(This article belongs to the Special Issue Biocompatible Materials Investigated with Optical Methods)
Dental adhesives are used in a wide range of applications, including to place direct composite restorations in frontal or posterior teeth. One of the most frequent causes for the failure of composite resin restorations is microleakages. The first aim of this work is to introduce a new type of self-etched dental adhesive doped with magnetic nanoparticles (MPs) synthetized in the laboratory. The scope is to produce adhesives with a minimized width/thickness to decrease the risk of microleakages. The second aim is to assess the width/thickness of the adhesive layer in all the characteristic areas of the teeth using both the less precise but most common optical microscopy and the more accurate and volumetric micro-Computed Tomography (CT) investigations. Twenty extracted teeth have been divided into four groups: Group 1 includes ‘blank’ samples with adhesives that are not doped with MPs; Group 2 includes samples with adhesives doped with MPs; Groups 3 and 4 include samples with adhesives doped with MPs that are subjected to an active magnetic field for 5 and 10 min, respectively. Microscopy investigations followed by micro-CT and EDAX are performed on the adhesive. While a rather good agreement is obtained between the microscopy and micro-CT results, the capability of the latter to offer a full volumetric reconstruction of the layer is exploited to analyze the adhesion of the four considered dental materials. Thus, from micro-CT results the graphs of the surface areas as functions of the adhesive layer width are modeled mathematically, as well as the volume of sealants, for each of the four groups. To our knowledge, it is the first time that such a methodology is used. Characteristic parameters are extracted and the ascertainment of the optimal parameter that should be utilized for such assessments is discussed. The study demonstrates the adhesion improvement produced for Groups 3 and 4, where MPs are used. It also concludes that the magnetic field should be applied to the adhesive material for the longest possible exposure time (with a trade-off with the clinical duration of the treatment). View Full-Text
Keywords: dental adhesive; magnetic nanoparticles; micro-CT; optical microscopy; adhesive layer thickness; modeling; multi-parametric analysis dental adhesive; magnetic nanoparticles; micro-CT; optical microscopy; adhesive layer thickness; modeling; multi-parametric analysis
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MDPI and ACS Style

Zaharia, C.; Duma, V.-F.; Sinescu, C.; Socoliuc, V.; Craciunescu, I.; Turcu, R.P.; Marin, C.N.; Tudor, A.; Rominu, M.; Negrutiu, M.-L. Dental Adhesive Interfaces Reinforced with Magnetic Nanoparticles: Evaluation and Modeling with Micro-CT versus Optical Microscopy. Materials 2020, 13, 3908. https://doi.org/10.3390/ma13183908

AMA Style

Zaharia C, Duma V-F, Sinescu C, Socoliuc V, Craciunescu I, Turcu RP, Marin CN, Tudor A, Rominu M, Negrutiu M-L. Dental Adhesive Interfaces Reinforced with Magnetic Nanoparticles: Evaluation and Modeling with Micro-CT versus Optical Microscopy. Materials. 2020; 13(18):3908. https://doi.org/10.3390/ma13183908

Chicago/Turabian Style

Zaharia, Cristian, Virgil-Florin Duma, Cosmin Sinescu, Vlad Socoliuc, Izabell Craciunescu, Rodica Paula Turcu, Catalin Nicolae Marin, Anca Tudor, Mihai Rominu, and Meda-Lavinia Negrutiu. 2020. "Dental Adhesive Interfaces Reinforced with Magnetic Nanoparticles: Evaluation and Modeling with Micro-CT versus Optical Microscopy" Materials 13, no. 18: 3908. https://doi.org/10.3390/ma13183908

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