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Showing 1 to 20 of 22 for “"Degree of conversion"”.
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Orthodontic bracket bond strength and resin composite adhesive degree of conversion associated with type of curing unit and total energy
This study examined the effect of light curing sources on shear bond 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 …
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Evaluation of multiple and single emission peak light emitting diode light curing units effect on the degree of conversion and microhardness of resin-based pit and fissure sealant
… the polymerization efficiency through the degree of conversion (DC) and Knoop microhardness (KHN) of a resin-based pit and fissure sealant at various light curing times and two distances compared to a single emission peak LED LCU. Method: Sixty disks of resin-based pit and fissure sealant …
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Effect of Delayed Polymerization Time and Bracket Manipulation on Orthodontic Bracket Bonding
This study examined the effect of bracket manipulation in combination with delayed polymerization times on orthodontic 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 …
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The effect of filler on the mechanical properties of a novel resin-based calcium phosphate cement
… In the present study, we investigated the use of a TCP-filled composite resin as a possible tooth restorative-material. An experimental TCP-based composite was prepared using monomer with a mixture of 34.3 percent by mass of EBPADMA, 34.2 percent by mass of HmDMA, and 30.5 percent by mass of …
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Composite cure and post-gel shrinkage with different halogen and LED curing lights
The objective of this research study was to determine the curing efficiency of different LED (light-emitting diodes) and halogen curing lights through various selected properties such as the thermal emission, effectiveness of cure, depth of cure, polymerization shrinkage and degree of conversion. …
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Effects of Alpha-Tocopherol Antioxidant on the Bonding Properties of Resin Adhesive to Dentin Bleached with Sodium Perborate
… for bonding after bleaching teeth. Reversal of the bond strengths back to pre-bleached levels can be obtained with application of 10% alpha-tocopherol in a 2-hour time frame, or by delaying bonding for two weeks. This study evaluated the effectiveness of a 5-minute application of 20% …
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Structure-property behavior of sol-gel derived hybrid materials
… studies were carried out on a number of different hybrid sol·gel materials. Multifunctional silicon ethoxides were prepared and studied by solid state ²⁹Si NMR and Raman spectroscopy to determine the type of silicate structures formed and the degree of conversion attained by the …
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Biodegradable Polymeric Ion Releasing Fillers
… caries in children by sealing pits and fissures of molars. However, polymerization shrinkage can lead to marginal leakage and secondary caries over time. Biodegradeable polymeric ion-releasing fillers (PIRFs) synthesized from alginate have the potential to be a useful sustainable tool that can …
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Cure Kinetics and Processing Parameters of Neat and Reinforced High Performance Epoxy Resins: Evaluation of Techniques
… equation parameters for the curing reaction of a commercial glass fiber reinforced high performance epoxy prepreg composed of the tetrafunctional epoxy tetraglycidyl 4,4-diaminodiphenyl methane (TGDDM), the tetrafunctional amine curing agent 4,4-diaminodiphenylsulfone (DDS) and an ionic …
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Synthesis and characterization of "non-shrinking" nanocomposites for dental applications
The aim of this study was to design and develop novel low shrinkage nanocomposites based on SSQ (Polyhedral Silsesquioxane) for dental applications. SSQ based nanocomposites with various types of methacrylate and/or epoxide functionalities were synthesized based on inexpensive starting materials. …
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Effect of Final Irrigation on Sealer-Dentin Interface for a Methacrylate-Based Resin Sealer
The purpose of this study was to evaluate the effect of different final irrigation technique (removing or not removing demineralized collagen) in combination with controlled intracanal residual moisture level (dry or moist) and canal location (middle or apical) on the quality of the sealer-dentin …
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Effects Of Delayed Polymerization Time and Bracket Manipulation on Orthodontic Resin Modified Glass Ionomer Adhesive
This study examined the effect of varying delayed polymerization times in combination with bracket manipulation on shear bond strength (SBS), degree of conversion (DC), and adhesive remnant index (ARI) score when using a resin modified glass ionomer (RMGI) adhesive. Specimens were divided into …
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Influence of Bracket Type Combined with Delayed Light Activation on Bracket-Adhesive Shear Bond Strength
This study examined the effect of bracket type and varying delayed polymerization times in combination with bracket manipulation on adhesive temperature change, shear bond strength (SBS), degree of conversion (DC), and adhesive remnant index (ARI) score when using a resin adhesive. Specimens from …
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Evaluation of Second Generation Indirect Composite Resins
… can be cured extraorally to improve the degree of conversion and other material properties. These materials are indicated as long term full coverage dental restorative materials. However the mechanical and physical properties of new Second Generation Indirect Composites for this …
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Characterization of Cure Kinetics and Physical Properties of a High Performance, Glass Fiber-Reinforced Epoxy Prepreg and a Novel Fluorine-Modified, Amine-Cured Commercial Epoxy.
… equation parameters for the curing reaction of a commercial glass fiber reinforced high performance epoxy prepreg composed of the tetrafunctional epoxy tetraglycidyl 4,4-diaminodiphenyl methane (TGDDM), the tetrafunctional amine curing agent 4,4'-diaminodiphenylsulfone (DDS) and an ionic …
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Alpha-T-T and T-T-alpha-T diagrams in intelligent processing of thermosetting composites
The majority of existing models for processing in thermoset matrix composites concentrate nearly exclusively on heat and mass transfer problems and account for material-related aspects in a very simplified manner The objective of this work is to provide that missing element by proposing a clearly …
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Beam profile characterization of light-emitting-diode curing units and its effect on polymerization of a resin-matrix composite
The general aim of this study was to investigate the influence of the localized irradiance beam profiles from multiple light-emitting-diode (LED) light-curing units (LCUs) on the polymerization pattern within a resin-matrix composite (RMC). Irradiance beam profiles were generated from one …
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New family of unsaturated polyamides from novel long-chain biomass-derived diacids
<p>A new class of bio-based aliphatic unsaturated polyamides (PA) is synthesized from C16-rich monounsaturated diacid (C16:1 diacids). C16:1 diacids are derived from fermented biomass intermediates through multistep purifications and hydrolysis. In this regards, we start with a biomass derived …
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The effect of feed rate and cracking time on carbon formation during the catalytic cracking of petroleum hydrocarbons
The process of catalytic cracking of petroleum hydrocarbons invariably produces a carbonaceous deposit on the surface of the solid catalyst which serves to reduce the activity of the catalyst. This investigation was undertaken to determine the effect of the feed rate and the length of the cracking …
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Structure and Properties Of dimethacrylate-Styrene Resins and Networks
One of the major classes of polymer matrix resins under consideration for structural composite applications in the infrastructure and construction industries is the dimethacrylate matrix resin. An investigation of the relationships between the chemical structures and properties of these …
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