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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 composite"”.
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Analysis of Southern Hardwoods as Furnish for a Wood Flake-Resin Composite Structural Material
Made available in DSpace on 2014-12-12T00:25:58Z (GMT). No. of bitstreams: 1 7511860.pdf: 5306181 bytes, checksum: 293fae4746b6e600238becdc104229c4 (MD5) Previous issue date: 1974
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Orthodontic bracket bond strength and resin composite adhesive degree of conversion associated with type of curing unit and total energy
… strength and degree of conversion of orthodontic resin composite adhesive as function of type of curing unit and total energy, as well as evaluated the correlation between shear bond strength and degree of conversion. Curing units included in the study were plasma arc (PA), light emitting diode …
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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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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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Effect of Delayed Polymerization Time and Bracket Manipulation on Orthodontic Bracket Bonding
… bracket shear bond strength and degree of resin composite conversion. Orthodontics brackets were bonded to extracted third molars in a simulated oral environment after a set period of delayed polymerization time and bracket manipulation. After curing the bracket adhesive, each bracket …
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Alteração da rugosidade superficial de resinas compostas após biodegradação por streptococcus mutans: uma revisão sistemática de literatura
… oral environment , make direct contact with the resin composite restorations thus are likely to cause changes in the surface of these restorations , thereby reducing its longevity .The aim of this research was to conduct a systematic review of studies that evaluated the surface roughness of the …
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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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The evaluation of an organophosphate thermosetting resin for use in a high temperature resistant composite and a study of chemistry of ionomer cements
… with resorcinol has given a resorcinol phosphate resin, which cured with hexamethylenetetramine. A pilot scale batch of this resin has been made and used in high temperature stability studies. Post-cured resorcinol phosphate resin-chrysotile asbestos (30: 70) moulded bars retained 59.5% of their …
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The effects of process parameters on the properties of resin transfer molded composites
A series of composite panels were fabricated by resin transfer molding (RTM), varying materials and process conditions. Reinforcements used included a fiberglass woven material, and AS-4 carbon in both sized and unsized plain weave fabrics. Vinyl ester, epoxy, and cyanate ester resins were pressure …
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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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Mechanical properties of a new zinc-reinforced glass ionomer restorative material
… Molar (3M ESPE) and EQUIA Fil (GC America). A resin composite, Premise (Kerr), was included as a control group except for fracture toughness. Methods: Fracture toughness (KIC) testing was done according to ISO 13586, using single edge notched-beam specimens (n=10), loaded until failure in a …
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A Comparison of Three Debonding Techniques Employing Two Methods of Tooth Preparation
… conditioner, a primer solution, and an adhesive resin. Newer systems have combined the conditioning and priming agents into a single acidic primer solution. The purpose of this investigation is to evaluate the three debonding techniques (shear-peel, tension, torsion) using stainless steel …
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Effect of Thickness and Substrate on Color Matching with Translucent Tetragonal Zirconia
… substrates: titanium, gold hue, dark shade resin composite (ND8) and white opaque zirconia. Mean ΔE and ΔL were calculated between the control and test groups. The clinical significance thresholds were set as following; perceptible threshold ΔE=1; acceptable thresholds ΔE=3.7, ΔL= |±2|. …
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The ion release behaviours and water sorption of novel resin-based calcium phosphate cement
… study was to examine TCP-filled restorative resins at different concentration levels at different time intervals to characterize the concentrations of Ca and PO4 ions released, and to measure the water sorption (WS) of these resins. An in vitro study was conducted by formulating resin …
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Friction and Wear Performance of Lifeboat Launch Slipways
… replaced with a low-friction jute fibre/phenolic resin composite. The composite slipway lining material was selected in part because it was able to run unlubricated or water lubricated. However the friction problems have been such that it is usual to line the slipway with grease before every …
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'Quat-Primer' polymers based on b-PEI and their application in composites
… polymers (i) as primers in carbon fibre - epoxy resin composite and (ii) UV curable coatings were also investigated. The primer polymers to be used in carbon fibre epoxy resin composites should serve two functionalities (i) to bind to the surface of carbon fibres via electrostatic forces of …
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Schrumpfungsverhalten von Kompositen bei Aushärtung mit unterschiedlichen Polymerisationsgeräten bzw. -verfahren in vitro
Ziel der vorliegenden Arbeit war die Bestimmung der Polymerisationskinetik und des Konversionsgrades von fünf verschiedenen lichthärtenden Kompositen nach der Polymerisation mit Plasmabogenlampen im Vergleich zu Standard Halogenlampen und Soft-Start Verfahren. Zu diesem Zweck wurde die …
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Restmonomergehalt von Kompositen bei Aushärtung mit unterschiedlichen Polymerisationsgeräten bzw. -verfahren in vitro
Das Ziel der vorliegenden Arbeit war die Bestimmung der freigesetzten Bestandteile aus Kompositkunststoffen bei unterschiedlichen Bestrahlungsverfahren. Miteinander verglichen wurden die Halogenstandard-, die Halogensoftstarthärtung und die Plasmahärtung. Zudem sollten die initiale und die …
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Beam profile characterization of light-emitting-diode curing units and its effect on polymerization of a resin-matrix composite
… (LCUs) on the polymerization pattern within a resin-matrix composite (RMC). Irradiance beam profiles were generated from one quartz-tungsten-halogen and various single and multiple emission peak LED LCUs using a camera-based beam profiler system combined with LCU power measurements obtained …
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The Identification of Composite Resin Restorations within Natural Teeth
Composite resin has become a very widely-used restorative material due to excellent physical and aesthetic properties. Unfortunately this makes visual detection more difficult. Restorations form a unique feature of an individual dentition. Therefore it is important to identify composite in …