Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Resin composites"”.
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Production of phenol-formaldehyde resin composites
… laminates based on phenol-formaldehyde resins, with a view of suggesting ways of improving the process economics and/or the physical properties of the final product. Aspects of impregnation, drying, and lamination were investigated. The resins used in all experiments were …
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High elastic modulus nanopowder reinforced resin composites for dental applications
… of high elastic modulus nanopowder reinforced resin composites and their mechanical properties are studied. Materials with higher elastic modulus, such as alumina and diamond, are used to replace the routine filler material, silica, in dental resin composites to achieve the desired properties. …
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Chemical Kinetics and Heat Transfer in Polyurethane Foam and Resin Composites
… polyurethane foam and the fiberglass-reinforced resin is investigated individually. An adiabatic method, which is commonly used by many investigators, is used for the polyurethane foam, while an isothermal degree and the rate of cure relationship is applied for the resin. A heat transfer effect …
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Exploring the variability in mechanical property testing of dental resin composites
The invention of dental resin based-composites (RBCs) has provided a broad range of materials for the restoration of load-bearing posterior teeth with excellent clinical results and adequate longevity. Currently, a lack of consensus exists among researchers regarding classification of RBCs as a …
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The effect of the oxygen inhibition layer on interfacial bond strengths and stain resistance of dental resin composites
… polymerisation reactions of photoactive resins used in dentistry are inhibited by oxygen. There is a need to better understand the effects oxygen inhibition on critical properties of dental resins and resin composites which may compromise the success of dental resin composite …
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The effect of filler on the mechanical properties of a novel resin-based calcium phosphate cement
Several studies have found that resin-based amorphous calcium phosphate (ACP) composites can function well for applications that do not require high mechanical demand. Milled tricalcium phosphate (TCP), a new calcium-phosphate-releasing material, is crystalline in nature, suggesting it to be …
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Efeito in vitro da erosão nas propriedades nanomecânicas de resinas compostas
… and elastic modulus) of dimethacrylate-resin and silorane-resin composites. Three compounds were investigated: Filtek Z250, Filtek Z350 and Filtek Filtek P90. Five samples of each material were prepared in accordance with the storage medium: erosive challenge and artificial saliva …
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Interfacial Adhesion Evaulation of Uniaxial fiber-Reinforced-Polymer Composites by Vibration Damping of Cantilever Beam
The performance of fiber-reinforced composites is often controlled by the properties of the fiber-matrix interface. Good interfacial bonding (or adhesion), to ensure load transfer from matrix to reinforcement, is a primary requirement for effective use of reinforcement properties. Thus, a …
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Silicone resins and their composites
… and condensation cure (4-3136) silicone resins have been studied for their mechanical property change with temperature. Properties include maximum flexural stress, flexural modulus and fracture toughness K[sub]IC. Temperature effect on mechanical properties of addition cure resin is …
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Processing of toughened cyanate ester matrix composites
… performance composite matrix applications. The resin investigated was a Bisphenol-A cyanate ester toughened with hydroxy functionalized phenolphthalein based amorphous poly(arylene ether sulfone). The thermoplastic modified toughened networks exhibited improvement in the fracture toughness over …
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Cuspal Deflection in Premolar Teeth Restored with Bulk-Fill Resin-Based Composite Materials
… To investigate the effect of bulk-fill resin based composite materials on cuspal deflection in large slot mesio-occlusal-distal cavities (MOD) in premolar teeth. Methodology: Thirty-two sound maxillary premolar teeth with large slot MOD cavities were distributed to four groups (n=8). …
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Efeito da incorporação de diferentes concentrações de nanopartículas de prata na resistência à tração diametral de compósito restaurador experimental
… followed by synthesis of the experimental resin. The different mixtures of composites were obtained with the addition of silver nanoparticles at concentrations of 0 (control); 0.06%; 0.125%; 0.25%; 0.5%; 1.0% and 2.0% weight, producing seven experimental resin composites. Cylindrical …
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Damage accumulation in hybrid woven fabric composites.
… nonhybrid E-glass woven fabric reinforced epoxy resin laminates have been investigated. In the second category hybrid and non-hybrid woven fabric reinforced epoxy resin laminates for similar fibre volume fractions have been investigated. Acoustic Emission (AE) and Scanning Electron Microscopy …
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Influence of a bleaching agent on stained direct composite resins
… the phenomenal strides in research of dental resin composites regarding their physical and mechanical properties, discolouration, either intrinsic or extrinsic still remains a major drawback and is one of the main reasons for the replacement of these restorations. Toothbrushing and polishing …
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Nanoparticles as strengthening agents in polymer systems
… introduced in carbon fiber reinforced epoxide resin composites. Different preparation conditions have been studied to obtain composite with enhanced performances that are ideal for the motor sports and aerospace industries. A new composite material has been fabricated utilizing surface-modified …
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The influence of ‘nanocluster’ reinforcement on the mechanical properties of a resin-based composite material
… introduction of innovative filled methacrylate resin composites has revolutionised the field of aesthetic restorative dentistry and provided a clinically viable alternative to amalgam-based restorations. The mechano-physical properties and resultant clinical longevity of these materials was …
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Development and characterisation of air-liquid interface exposure systems for cell and tissue cultures
… of cigarette smoke and aerosols on dental resin composites, where cigarette smoke caused 10-fold greater surface discolouration on tooth enamel compared to heated tobacco product aerosols after 14 days of exposure. Studies on 3D bronchial and nasal tissue cultures have revealed significant …
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Examination of Mechanical Stretching to Increase Alignment in Carbon Nanotube Composites
… the tensile strength and Young's modulus of the composites in the FSU study averaged 3081 MPa and 350 GPa, respectively. These values are for composites fabricated from 40% stretched CNT sheets and are 48% and 107% improvements over composites fabricated from the pristine, unstretched CNT sheets. …
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Assessment of the potential environmental impacts arising from mercury-free dental restorative materials
The field of dentistry and with it, the application of dental filling materials, is currently undergoing changes to adopt sustainability and environmental considerations into the clinical environment. This was largely triggered by the reduction of all products in use that contain Hg (mercury), …