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 27 for “"tooth enamel"”.
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Characterising the deformation behaviour of human tooth enamel at the microscale
Enamel plays an important role in tooth function. Optimal combinations of composition and structure endow enamel with unique mechanical properties that remain largely unexplored. Specifically, more detailed understanding of the loadbearing ability of enamel is needed to mimic it synthetically and …
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Microhardness and bleaching effectiveness on human tooth enamel after the application of nanohydroxyapatite
… Although 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 …
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Effect of Radiotherapy on Nano-Mechanical Properties and Chemical Composition of Tooth Enamel and Dentin
… dental lesions characterized by enamel delamination near the dentin-enamel junction (DEJ) by evaluating enamel and dentin nano-mechanical properties and chemical composition before and after in vitro and in vivo radiotherapy. For the in vitro group, sections from non-carious third …
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Characterization of the Organic Matrix of Mature Human Tooth Enamel: Structure, Macromolecular Composition and Effect of Radiotherapy
Mature human tooth enamel contains a small amount of organic matrix locally concentrated within its innermost region, which is tougher and more crack resistant than the outer bulk phase. Although the enamel organic matrix is regarded to contribute to these properties, its structure and …
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Electron paramagnetic resonance dosimetry and the use of Japanese wild boar tooth enamel as a dosimeter for reconstruction of lifetime external absorbed doses from the Fukushima Exclusion Zone
… establish characteristics of Japanese wild boar tooth enamel in the region of 0.25 – 12.0 Gy and to reconstruct external doses to wild boar native to the Fukushima Exclusion Zone using Electron Paramagnetic Resonance Dosimetry. The significance of Japanese wild boar in their ecosystem and their …
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STABLE ISOTOPE RATIOS AS A PROXY FOR HUMAN GEOGRAPHIC PROVENANCE: BIOGEOGRAPHICAL EVIDENCE FROM THE 2H, 18O, AND 13C SIGNATURES IN MODERN HUMAN TEETH
… isotope analysis of biogenic tissues such as tooth enamel and bone mineral has become a well‐recognized and increasingly important method for determining the provenance of human remains, and it has been used successfully in bioarchaeological studies as well as forensic investigations. Both 18O …
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An isotopic investigation into calving seasonality, diet and dairying in British Prehistoric cattle. Reconstructing animal husbandry at a sub-annual resolution using multi-isotope analysis and intra-tooth sampling.
… summer and autumn. This thesis uses intra-tooth isotope ratio analysis of cattle tooth enamel to predict birth seasonality as an indicator of dairying. Analysis was performed on first, second and third cattle molars from the archaeological sites of Mine Howe, Pool and Earl’s Bu (Iron Age …
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Late Pleistocene lithofacies, paleolimnology and ostracode fauna of kettles on the Illinoian till plain, Illinois, U.S.A
… Electron spin resonance analyses on Sangmonian tooth enamel from Hopwood Farm indicate an age between 73 to 137 ka.
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AVALIAÇÃO DAS AFECÇÕES ODONTOLÓGICAS EM EQUÍDEOS ATENDIDOS NO HOSPITAL VETERINÁRIO DA UFPB.
… before and 100% of them have presented excessive tooth enamel tips, in addition to other changes. These informations made us conclude that all animals needs veterinary monitoring for periodic dental treatments.
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Phenotypic Plasticity of Oral Jaw Dentition in Archosargus Probatocephalus
… sheepshead fed hard prey would have a thicker tooth enamel layer containing more calcium, and therefore be stronger than the tooth enamel layer of those fed soft prey items. Additionally, the mean functional jaw surface area, the percentage of tooth coverage of functional jaw surface, number of …
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A Systematic and Taphonomic Analysis of Late Pleistocene Cervid Remains and Isotopic Paleoecology of Herbivores from Guy Wilson Cave, Southern Appalachians, Tennessee
… and 3) carbon isotopes from cervid and herbivore tooth enamel (δ<sup>13</sup>C). Systematic identification reveals that there are at least three cervid species in the cave fauna based on fossil remains: <em>Odocoileus virginianus</em>, <em>Rangifer tarandus</em>, and either <em>Cervalces …
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Reconstructing the diets of southern African farmers: comparing stable isotopes across body tissues
… for each individual (δ¹³Cbone apatite, δ¹³Ctooth enamel, δ¹³Ccollagen, δ¹⁵Ncollagen). Dietary reconstructions using both typical 'fractionation factor' methods and recent bi- and multi-variate models are presented and compared. For this population, which consumed primarily C4 protein and …
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Biological and biomimetic mineralization via protein nanoribbon scaffolds
… is crucial for engineering bone and tooth and would open new vistas in hybrid materials design. In the case of tooth enamel, which is the hardest tissue in the body and consists of organized bundles of coaligned filamentous apatite crystals, co-aligned amyloid-like amelogenin …
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Climate, Ecology, and Human Evolution during the Plio-Pleistocene
… Carbon isotope data from large mammalian tooth enamel in three areas (southern Kenya & northern Tanzania, northern Kenya, and northern Ethiopia) demonstrate a long-term increase in the prevalence of C<sub>4</sub>-grazing taxa over time, primarily at the expense of …
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Déploiement et évaluation d’une offre de test de dépistage néonatal pour le rachitisme vitamino-dépendant de type 1A
… growth delays, multiple fractures, hypotonia and tooth enamel hypoplasia. Treatment with calcitriol (Rocaltrol®) restores active vitamin D levels and resolves most of the clinical manifestations mentioned above. However, some consequences persist during adult life, particularly on oral health. …
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Stable light isotopes in fauna as environmental proxies in the Southern African winter and year-round rainfall zones
… collagen, and δ¹³C and δ¹⁸O were measured in tooth enamel. Samples were taken from 27 species of indigenous wild mammals in game parks and nature reserves, i.e. relatively undisturbed natural environments. Animal species include primates, ungulates and carnivores collected from the following …
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Stable isotope ecology of modern herbivores from Mmabolela, Limpopo
… three porcupines (Hystrix africaeaustralis), and tooth enamel from nine zebra (Equus quagga). The porcupines show short-term, but not necessarily seasonal variations in their diets. δ 13C and δ18O profiles of the second and third molars of nine Equus quagga individuals are highly variable. A …
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Development of novel micaceous glass ceramics for dental applications using CAD/CAM Systems
… of producing a range of materials matching tooth enamel for aesthetics and mechanical properties. The candidate glass is a micaceous glass-ceramic which is compositionally based on a ternary phase system of 90 molar % Ba-phlogopite (Ba0.5Mg3(Si3AlO10)F2), 6 molar % calcium phosphate …
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Straight from the cow's mouth: investigating procurement and management strategies in cattle supplied to Great Zimbabwe using a multi-isotopic approach
… 18O, δ13C and δ15N profiles in serial samples of tooth enamel and dentine from 27 archaeological cattle teeth enable investigation of several aspects of cattle procurement and management. Taken together, the isotope measurements show that cattle at Great Zimbabwe came from a broad geographical …
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Explainable Machine Learning Prediction of Antimicrobial Peptide Targeting Streptococcus mutans
… acid-tolerant species. S. mutans thrives on the tooth enamel through adhesion and biofilm formation, where continuous acid production drives demineralization and leads to dental caries. This thesis developed an explainable machine learning pipeline to design antimicrobial peptides targeting S. …
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