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 54 for “"Sealants"”.
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Property determinants of dextran:polyethylene glycol adhesive sealants
… forces arising in the tissues. Adhesive sealants can mitigate risk by imparting a continuous stress distribution to tissues upon closure, as opposed to destructive stress concentrations. A novel class of dextran:polyethylene glycol hydrogels are a potential alternative to the limited …
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Tensile Testing of Cold-Applied Joint Sealants
… expansion and contraction of concrete slabs. Sealants are commonly used in pavement joints to keep debris, deicing chemicals, and moisture out of the joint. When a joint sealant fails, the pavement can quickly deteriorate; however, when a joint sealant functions well, the pavement maintains …
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Durability and aging of dental fissure sealants
… Samples of differently processed commercial sealants were immersed in an ethanol/water solution and extractions were analyzed by HPLC. An inverse correlation between the degree of cure and the % of elution as well as high level of extraction was found. An <i>in vivo</i> study has been …
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Development of adhesive test for hot-poured crack sealants
The student, Mohammed Sawalha, submitted this Thesis for approval on 2016-04-28 at 14:44.
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Model development and validation of bituminous-based crack sealants
… sealing treatment techniques. The performance of sealants was monitored after each winter for three years to determine a performance index (PI) consisting primarily of adhesive, cohesive, and overband wear. Field samples were collected from the sites to conduct laboratory testing and validate the …
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Evaluation of pavement joint sealants: a new testing technique
A new method to evaluate the performance of sealants, used in rigid pavement joints, was developed. A special fixture was designed to transfer cyclic in-line deflection, applied by a testing machine, to cyclic normal and shear deflections on a sealant sandwiched between two-2 x 2 x 2 in. portland …
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Performance-Based Evaluation of Joint Sealants for Concrete Pavements
… or expand (high temperature), respectively. Sealants also experience shear as heavy trucks travel over the joint and deflect the ends of the pavement slabs. In addition, sealants may also be exposed to a variety of environmental conditions, such as moisture, ultraviolet light, and jet fuel, …
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Evaluation of resin-based fissure sealants placed under field conditions
BACKGROUND: The application of dental sealants is a recommended procedure to prevent and control dental caries. However, despite strong evidence for the safety and effectiveness of dental sealants, their use still remains low, especially among children from lower socioeconomic communities. The …
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The diffusion of water and aviation fuel in polysulphide sealants
… and water in commercial and 'model' polysulphide sealants have been studied using simple gravimetric techniques. For Avtur, the mass uptake behaviour is explicable in terms of normal, Fickian diffusion, and the diffusion coefficient determined has been found to be independent of the experimental …
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Functional properties of polyurethane based sealants blended with polymeric modifiers
… sought to develop more durable cost effective sealants as well as cultivate a market for lignin, a highly underutilized by-product of the pulp and paper industry. The tensile and compressive performance characteristics of lignin and kaolin filled sealant formulations, compounded at different …
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The effectiveness of fibrin sealants in head and neck surgery
The utilisation of fibrin sealants as adjuncts in haemostasis during head and neck surgery has garnered increasing attention, yet their clinical efficacy remains a subject of debate. This thesis evaluates the effectiveness of fibrin sealants in patients undergoing head and neck surgery through a …
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Development of a novel test rig for the evaluation of aircraft fuel tank sealants
… conditioning, and it provides results to qualify sealants in a more realistic manner than current testing methods provide. The MSS enables evaluation and comparative testing of sealant systems when used for interfay, fillet and overcoat applications. The information provided is complementary to …
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Bioactive capabilities explored in polyurethane microcapsules and the inclusion into dental sealants and cement pastes
… tooth structure. Methods. Cements and sealants that contained microcapsules with water and controls without microcapsules were brushed with over-the-counter toothpaste; fluoride release was measured. Materials that contained microencapsulated solutions of 5.0M Ca(NO3)2, 0.8M NaF, 6.0M …
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Comparison of Two Orthodontic Sealants in Prevention of Enamel Demineralization : An In-Vitro and In-Vivo Study
… demineralization, application of orthodontic sealants is widely used to provide mechanical coating and fluoride release for the underlying enamel. The purpose of this study was to compare the efficacy in enamel protection during fixed orthodontic treatment in-vitro and in-vivo between two …
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Long-Term Performance of Polymeric Materials in Civil Infrastructure
… 2) silicone and self-healing polymeric concrete sealants. HDPE is a strong and durable plastic material that is commonly used to store a wide range of liquids ASTs. Currently, there are no established protocols for carrying out non-destructive testing (NDT) and assessment of HDPE ASTs for regular …
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Tissue-material interactions : bioadhesion and tissue response
… properties and tissue response. Soft tissue sealants are clinically-relevant biomaterials which impart therapeutic benefit through adhesion to tissue, thus exhibiting a direct functional dependence on tissue-material reactivity. Because adhesion can be rigorously quantified and correlated to …
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Biodegradable Polymeric Ion Releasing Fillers
Dental sealants are a highly effective tool used by dentists to prevent occlusal 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) …
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Mechanistic service life prediction of rigid pavement joint sealant: a new laboratory testing technique
A new method to evaluate the performance of sealants used in rigid pavement joints was developed. A special fixture, attached to a servo-hydraulic testing machine, was designed to transfer applied cyclic shear deflection to a sealant sandwiched between two 51 x 51 x 51 mm portland cement concrete …
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Scaling Carbon-Cement Supercapacitors for Energy Storage Use-Cases
… laboratory acrylic casings with hydrophobic sealants compatible with cementitious systems, (2) quantifying and mitigating shrinkage and swelling in nanocarbon cement matrices under electrolyte exposure, and (3) identifying corrosion-resistant current collectors that maintain conductivity and …
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