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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Ilie, Nicoleta
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Publications (6/6 displayed)
- 2025Response of Differently Structured Dental Polymer-Based Composites to Increasingly Aggressive Aging Conditions
- 2023Chemical and Structural Assessment of New Dental Composites with Graphene Exposed to Staining Agentscitations
- 2020Outcomes of Ultra-Fast (3 s) Photo-Cure in a RAFT-Modified Resin-Compositecitations
- 2017Academy of Dental Materials guidance—Resin composites: Part I—Mechanical propertiescitations
- 2017Academy of Dental Materials Guidance—Resin Composites: Part II— Technique Sensitivity (Handling, Polymerization, Dimensional Changes)citations
- 2009Spatial and cure-time distribution of dynamic-mechanical properties of a dimethacrylate nano-compositecitations
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article
Spatial and cure-time distribution of dynamic-mechanical properties of a dimethacrylate nano-composite
Abstract
Objective: The purpose of this study was to evaluate a nano-filled dental composite, with varying cure irradiation-time, in terms of the spatial distribution of dynamic-mechanical properties determined at nanometre scale and the resultant distinction between filler, matrix and inter-phase regions. Materials and methods: Specimen groups (n = 5) of the composite Filtek Supreme XT were cured in 2 mm deep molds for 5, 10, 20 and 40 s, and stored for 24 h in distilled water at 37 °C. Properties were measured at 2 mm depth, on the lower specimen surfaces. Nano-dynamic-mechanical parameters (complex, storage and loss modulus, tan δ) were determined at an array of 65,000 locations in a 5 μm × 5 μm area. Micro-mechanical properties (hardness, modulus of elasticity, creep and elastic/plastic deformation) were also measured and additionally the real-time degree of cure, by ATR-FTIR, for 10 min after photo-initiation and after storage. Results: The spatial distribution of nano-dynamic-mechanical properties varied significantly enabling four distinguishable matrix, filler-cluster and inter-phase regions to be identified. Proceeding from matrix to filler-cluster locations, complex-moduli increased linearly and loss-factors decreased linearly, consistent with visco-elastic composite theory. Curing time strongly affected all measured properties at 2 mm depth. The organic matrix was shown to be inhomogeneous for all curing times. By increasing cure-time, the proportion of less well polymerized area decreased from 37.7 to 1.1%, resulting in a more homogeneous organic matrix. Significance: The experimentally observed graduated transition, in complex modulus and related dynamic-mechanical properties, across the matrix - inter-phases - filler-cluster regions is conducive to low internal stresses, in contrast to the abrupt modulus transitions anticipated or observed in many other particulate composite structures. The identification of these phase-regions provides a realistic basis for accurate nano- and micro-mechanical computational modelling. © 2008 Academy of Dental Materials.