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 140 for “"Microhardness"”.
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Effect of Antibiotic Pastes on Chemical Structure and Microhardness of Radicular Dentin
… at concentrations of 1 g/mL and 1 mg/mL, on the microhardness and chemical structure of radicular dentin. Materials and Methods: Roots from extracted, unrestored, non-carious human premolar teeth were sectioned. An antibiotic paste (MTAP or TAP) or sterile water (control) was applied to treatment …
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Microhardness and bleaching effectiveness on human tooth enamel after the application of nanohydroxyapatite
… studies have indicated a reduction in enamel microhardness following bleaching, the correlation between bleaching and enamel hardness is inconsistent. This in vitro study aimed to investigate the potential of nanohydroxyapatite (nHA) as a bleaching agent and its effect on enamel microhardness …
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Effect of the GentleWave System on dentin microhardness and sealer penetration: an in vitro study
… from the apex. Assessment methods included microhardness testing and scanning electron microscopy (SEM). Vickers Test results revealed significant differences in hardness values, with Group C exhibiting the highest and Group T the lowest values. In terms of sealer penetration, Group G …
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Characterization of thermally diffused bordie layers on AISI 1018 steel : residual stresses (by synchrotron radiation) and microhardness
… techniques included coating thickness, microhardness, residual stresses and elemental distributions. The average thickness of the coating was determined to be 45um while the average boride needle penetration was found to be 57um Line-scan energy dispersive x-ray analysis helped verify …
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The effect of two bleaching products on microhardness and surface texture of different dental aesthetic restorative materials
… effect of two different bleaching agents on the microhardness and the surface texture of six different aesthetic restorative materials were evaluated. <br>Four different composite resins (a hybrid, a flow, a micro-hybrid and a nano-hybrid), an ormocer, and a ceramic, were used and two bleaching …
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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
… 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 (Delton, DENTSPLY, York, PA) samples …
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Beam profile characterization of light-emitting-diode curing units and its effect on polymerization of a resin-matrix composite
… A mapping approach was used to investigate DC, microhardness and cross-link density (CLD) within 5×5×2 mm specimens at various depths; top, 0.5, 0.7, 0.9, 1.1, 1.3,1.5 mm and bottom. The localized irradiance correlation with its corresponding DC, microhardness and CLD was explored, and localized …
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Effect of Overlying Material on EndoCem Mineral Trioxide Aggregate Setting Reaction in Primary Molar Pulp
… impact of common restorative materials on the microhardness of ENDOCEM-MTA in primary molar pulpotomies. The study assessed whether the material placed over ENDOCEM-MTA affects its setting reaction, surface hardness, and uniformity across depths. Methods: Fifty extracted primary molars were …
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Investigation into coatings produced from nanoparticle blended feedstock for rotating equipment repair applications
… indentation tests are carried out to assess the microhardness variation across the coatings. In the case of coatings produced by GMAW, it is found that fine structures are formed in the coating due to the presence of nano particles and they resulted in increased microhardness of the coatings. In …
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Physical and Biologic Properties of Calcium Silicate Endodontic Sealers
PURPOSE: To determine the cytotoxic effects, microhardness, and solubility of Endosequence BC Sealer, BioRoot RCS, NeoSEALER Flo, and BIO-C SEALER. MATERIALS AND METHODS: Nuclei counting assay and MTT assay were used to determine the cytotoxicity of the sealers at dilutions of 1:1, 1:4, and 1:32 …
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Comparative Enamel Remineralization Using SDF, Fluoride Varnish, and Curodont™
… and evaluation included cross-sectional Knoop microhardness (CSMH) testing at depths of 25–225 µm to assess mechanical properties. Additionally, micro-computed tomography (micro-CT) was performed to assess lesion depth and evaluate the mineral density of each treatment group. CSMH data and …
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In Vitro Study Comparing Treatments for Incipient Enamel Lesion Remineralization
… were prepared, frozen, and subjected to baseline microhardness testing. Samples were randomized into four groups (n=5/group): Icon, FV, SDF, and a control group. Artificial caries lesions were induced and treated per manufacturers’ instructions. Samples were immersed in a saliva-like …
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Comparison Of Vickers Hardness Between Dental Ceramics And Hybrid Materials
… has the lowest. Celtra Duo has a higher mean microhardness than Emax, yet still lower than Zirconia. Vita Enamic had lower microhardness than both Emax and Zirconia. VarseoSmile BEGO has lower microhardness than both Emax and Zirconia. Conclusion: Vickers Hardness for the tested materials can …
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Microstructure, Thermal Stability and Consolidation of Nanostructured and Ultrafine Structured Cu based Metal Matrix Composite and Alloy Powders Produced by High Energy Mechanical Milling
… of the microstructure and corresponding microhardness change as a function of annealing temperature. It was found that for Cu and Cu-2.5vol.%Al2O3 composites after heat treatment at 150 C, the Cu grain sizes decreased due to recrystallisation, and increasing the annealing temperature to …
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Abrasive wear resistance of ruthenium aluminide intermetallic and ferritic steels containing a sigma intermetallic phase
… were investigated by compression testing and microhardness measurements. Abrasion testing was carried out on a pin on belt abrasion apparatus. The surface response of the specimens to abrasive wear was characterised by optical and scanning electron microscopy. Microhardness of the specimens …
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Efficacy of Curodont in Managing Incipient Caries in Primary Teeth
… Specimens were then sectioned, and Knoop microhardness values were measured and calculated (25gf; 10 sec) beginning 25 µm below the outer enamel surface and extending in 25 µm intervals to a depth of 225 µm. Using R software, a linear mixed-effects model was used to evaluate the effects of …
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Three dimensional surface texture analysis for characterisation of enamel erosion
… model. For the polished samples, enamel surface microhardness was measured using a Knoop hardness tester, step height enamel loss was measured using a white-light confocal profilometer and surface texture was measured using confocal laser scanning microscopy in combination with MountainsMap® …
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Mechanical properties of a new zinc-reinforced glass ionomer restorative material
… followed by flattening and polishing. Knoop microhardness (KHN) was performed (25 g, 30 s),on pre-determined areas of the polished surfaces. For toothbrushing wear resistance and roughness, specimens were brushed in an automated brushing machine (200 g) with a suspension of dentifrice and …
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In vitro evaluation of polymerization energy for bulk fill composites
… of this study was to measure the light energy, microhardness (VHN), and elastic modulus across the depth of one conventional and three bulk-fill RBCs. Materials and Methods: Three commercially available bulk-fill RBCs (Tetric EvoCeram Bulk Fill [TE], SonicFill [SF], X-tra fill[XF]) and one …
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