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The Global ETD Search service is a free service for researchers
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 261 to 269 of 269 (0.031 seconds)Spelling suggestions: "subject:"xiie"" "subject:"iiie""
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Molares permanentes de pacientes jovens com cárie profunda versus tratados endodonticamente e restaurados com resina composta bulk fill – Análise da força de mordida e por elementos finitos específico / Pulp caries affected versus endodontic treated and composite resin restored young permanent molars -bite force and specific finite element analysisRodrigues, Monise de Paula 09 February 2018 (has links)
CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico / FAPEMIG - Fundação de Amparo a Pesquisa do Estado de Minas Gerais / O tratamento endodôntico associado à restauração direta com resina composta
tem sido utilizado para restaurar molares severamente destruídos em pacientes
jovens. O objetivo deste estudo foi avaliar o efeito de diferentes níveis de perda
de estrutura dentária antes e após a realização de tratamento endodôntico e
restauração com resina composta bulk fill na distribuição de tensões e magnitude
da força de mordida. Foram selecionados três pacientes jovens (9, 10 and 12
anos de idade) com primeiros molares com cárie extensa e envolvimento pulpar
com diferentes níveis de perdas de estrutura dentária: PI, manutenção das duas
cristas marginais e de todas as cúspides; PII, manutenção de pelo menos uma
crista marginal e perda mínima de uma cúspide; e PIII, perda de ambas as cristas
marginais, mantendo apenas as cúspides vestibulares. Os molares foram
tratados endodonticamente utilizando técnica de instrumentação rotatória e
obturados com guta-percha e cimento AHPlus (Dentsply) e em seguida foram
restaurados com Filtek Bulk Fill Posterior (3M ESPE). A força de mordida em
Newtons (N) foi mensurada antes e após a intervenção endodôntica e
restauradora na posição habitual de oclusal usando aparelho de força de
mordida por meio de uma célula de carga (Kratos). Tomografias
computadorizadas cone beam foram realizadas antes e após o procedimento
endodôntico/restaurador, e arquivos DICOM (.dcm) foram exportados para o
software Mimics, 3-Matic (Materialize) e Patran (MSC Software) para criação dos
modelos específicos dos pacientes nos dois momentos experimentais. A
aplicação de carga foi simulada por contato oclusal dos dentes antagonistas nas
cargas mensuradas clinicamente em cada momento. Nos modelos que
representam as condições iniciais foram aplicados tanto os valores de força de
mordida (N) mensurados no momento inicial quanto após o procedimento
reabilitador: PI. 30,1/136,6; PII. 34,3/133,4 e PIII. 47,9/124,1 e para os modelos
que representam a condição final foram utilizados os valores obtidos após a
intervenção endodôntica e restauradora: PI. 136,6; PII. 133,4 e PIII. 124,1. As
restaurações foram avaliadas após 2 anos. Após intervenção endodôntica e
restauradora a força de mordida aumentou em 260% (de 36,7±11,6 para
12
131,9±17,8). Antes da intervenção endodôntica e restauradora, as tensões se
concentraram na estrutura coronal e, após a reabilitação foram transferidas de
forma homogênea para a dentina radicular, independente do nível de perda de
estrutura dentária. Quando a carga final foi aplicada nos modelos de condições
iniciais, evidenciou-se elevada concentração de tensão em áreas enfraquecidas
e na região de furca. As restaurações apresentaram desempenho adequado
após 2 anos. A presença de cárie extensa com envolvimento pulpar afetou
negativamente a carga de mordida e aumentou a concentração de tensão na
estrutura frágil o que pode favorecer à ocorrência de fratura dental. O tratamento
endodôntico associado à restauração direta em resina composta bulk fill
demonstrou ser um método eficiente para restabelecer o desempenho
mastigatório e a eficiência biomecânica dos molares jovens com
comprometimento severo da estrutura coronária. / Endodontic treatment (ETT) followed by direct composite resin restoration has
been used for rehabilitating the severely damage molar teeth in young patients.
The aim of this study was to evaluate the effect of the molar teeth with different
levels of the dental structure loss before and after the ETT and direct restoration
with bulk fill resin composite on the stress distribution and the bite force
magnitude. Three young patients (with 9, 10 and 12 years old), with the first
mandibular molar teeth with deep occlusal caries with pulp involvement were
selected attending with different levels of the dental structure loss: PI, both
marginal ridge and all cusps; PII, maintenance of one marginal ridge and loss of
one cusp; and PIII, loss of both marginal ridge, maintaining only buccal cusps.
ETT was restored using Filtek Bulk Fill Posterior (3M ESPE). The bite forces in
Newtons were measured initially and postoperatively for all teeth in habitual bite
force using a miniload cell. Cone-beam tomography imaging was performed, and
the Digital Imaging and Communication in Medice (.dcm) files were exported to
Mimics, 3-Matic (Materialise) and Patran (MSC Software) software to create a
patient-specific FEA models. Bite load was carry out using contact load applied
by antagonist teeth in two moments: without ETT and restoration: PI. 30.1/136.6;
PII. 34.3/133.4 and PIII. 47.9/124.1; and after restorative procedure: PI. 136.6;
PII. 133.4 and PIII. 124.1 N. Performing ETT and bulk fill resin composite
restoration the bite load increased 260% (36.7±11.6) to 131.9±17.8). The
restorations were evaluated after 2 years. Before rehabilitation the stresses
concentrated on weakened coronal dental structure and after rehabilitation they
were homogeneously transferred to root dentin, irrespective of the level of the
tooth structure loss. When the postoperatively bite load was applied on nontreated
tooth models, high stress concentration on weakened areas was verified.
The restorations performed perfectly after 2 years. The extensive caries with pulp
involvement affected negatively the bite load and increased the stress
concentration on weakened areas and at furcation favoring the tooth fracture. The
ETT and bulk fill resin composite restoration showed to be an efficient method for
rehabilitate the biomechanical performance of molar teeth of young patients
severely compromised structurally. / Dissertação (Mestrado)
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| 262 |
The admissibility and evaluation of scientific evidence in courtFaurie, Annari 11 1900 (has links)
Increasing use is being made of various types of scientific evidence in court. The
general requirement for the admissibility of such evidence is relevance. Although
expert evidence is considered to be opinion evidence, it is admissible if it can assist the
court to decide a fact in issue; provided that it is also reliable. In South Africa, the
initial wide judicial discretion to either admit or exclude unconstitutionally obtained
evidence, has developed into a more narrowly defined discretion under the final
Constitution. Examples of scientific evidence, namely, DNA evidence, fingerprints,
psychiatric evidence, bite-mark evidence and polygraph evidence are considered and
problems inherent in the presentation of such evidence in courts in various jurisdictions
are highlighted. An investigation of the presentation and evaluation of evidence in
both the accusatorial and inquisitorial systems seems to indicate that the adversarial
procedure has a marked influence on the evaluation of evidence / Criminal and Procedural Law / LL.M. (Law)
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Zhodnocení stability osteosyntézy po sagitální osteotomii větve dolní čelisti / Evaluation of the stability of osteosynthesis of mandibular ramus sagittal split osteotomyNieblerová, Jiřina January 2012 (has links)
Orthognatic surgery deals with congenital and acquired dentoalveolar or skeletal deformities of the face. An unfavourable downward rotation of a mandible and posterior vertical maxillary excess cause an anterior open bite, which is characterized by excessive anterior facial height in the lower third, a gap between the incisors in maximal occlusion and a large mandibular angle. Osteotomy (mainly Le Fort I osteotomy or bilateral sagittal split osteotomy of the mandibular ramus - BSSO), ostectomy or distraction osteogenesis are performed to correct the orthognatic deformities. Osteosynthetic materials based on titanium or bioresorbable materials are used in the form of miniplates with monocortical screws, or bicortical screws are utilized to fix the bony fragments. Stability of the new jaws position is the main criterion for success. Relapse causes a loss of occlusion and consequently functional and aesthetic disorders. Relapse consists of skeletal and dental factors. Skeletal relapse is usually divided into early and long-term relapse. BSSO with counter-clockwise (CCW) rotation of the occlusal plane alone was traditionally considered to be the least stable treatment method. Some authors suggest the use of two miniplates on each side of the osteotomy, but we have not found scientific proof of the...
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L'ulcère de Buruli dans un centre de santé rural au BéninDebacker, Martine M.J. 15 April 2005 (has links)
Notre travail porte sur tous les cas UB enregistrés entre 1997 et 2003 au Centre Sanitaire Nutritionnel Gbemoten (CSNG) de Zagnanado dans la région du Zou au Bénin. Une base de données a été créée et a permis d’analyser divers aspects de l’UB. Ces analyses ont donné lieu à diverses publications dont les résultats essentiels sont repris ci-dessous.<p>Une première publication porte sur 1700 cas consécutifs admis au CSNG entre 1997 et 2001. Ces données nous ont permis d’illustrer l’évolution du nombre des cas d’UB au cours des années, par département et par sous-préfecture. Le nombre de patients UB qui se présentent au centre est fonction de différents facteurs comme par exemple l’ouverture d’autres centres de traitement, l’organisation de campagnes d’information sur l’UB mais aussi de changements dans l’environnement. Au niveau des formes de la maladie, nous avons montré que les formes non ulcérées sont aussi fréquentes que les formes ulcérées. La forme de la maladie est liée au délai à consulter le CSNG. Les atteintes osseuses sont fréquentes et sont présentes chez plus de 13% des cas. Au fil des années, le délai à consulter le CSNG ainsi que la durée de l’hospitalisation ont été fortement réduits, passant de 4 mois à 1 mois dans le premier cas et de 9 mois à 1 mois en ce qui concerne l’hospitalisation. Les personnes ressources à cibler lors des campagnes de sensibilisation sur la maladie ont été identifiées. Il s’agit des anciens malades, qui dans 68% des cas, réfèrent les nouveaux malades au CSNG.<p>Une deuxième publication, portant sur la même période, nous a permis de mettre en évidence pour la première fois des taux d’UB élevés chez les sujets de 60 ans et plus, probablement du fait d’une diminution de leur immunité. Chez les 60 ans et plus, les hommes sont plus à risque de développer un UB que les femmes. Par contre aucune différence dans le risque d’UB en fonction du sexe n’est trouvée chez les moins de 60 ans. Les lésions d’UB prédominent au niveau des membres inférieurs pour tous les groupes d’âge. Du fait de leur petite stature, les enfants ont une répartition des lésions qui touchent tout le corps. Chez les adultes, les femmes présentent plus de lésions que les hommes au niveau de la tête, du cou et du tronc. Les sujets de moins de 15 ans développent souvent des lésions multifocales, associées à des atteintes osseuses. Ces atteintes osseuses constituent les formes graves de la maladie.<p>Notre troisième publication porte sur le suivi des malades au niveau des villages, entre mars 2000 et février 2001, afin de déterminer les taux de récurrences de l’UB. Le taux de récurrence de la maladie est faible (6.1%) pour un temps de suivi des malades allant jusqu’à 7 ans. La majorité des malades soignés au CSNG étaient en bonne santé. Nous n’avons néanmoins pu retrouver qu’un nombre limité de malades.<p>Dans notre quatrième publication, nous avons pu mettre en évidence le développement d’un UB sur le site d’une morsure humaine. La surface de la peau du malade a pu être contaminée par M. ulcerans et la morsure (= traumatisme) a occasionné l’entrée de M. ulcerans dans le derme. Une autre explication plausible est que la morsure ait réactivé un foyer latent de M. ulcerans au niveau du site de la morsure.<p>Notre base de données nous a également permis de contribuer à d’autres études, notamment celles sur l’influence du BCG et de la schistosomiase sur l’UB. Dans les deux cas, nous trouvons une association significative avec les formes graves de l’UB, l’absence de vaccination BCG et la schistosomiase favorisant le développement de formes osseuses. Aucun lien n’a pu être établi entre la présence ou l’absence de l’infection à Schistosoma haematobium et l’UB.<p>Dans la dernière partie de notre travail, nous nous sommes attachés à l’étude de quelques facteurs de risque de l’UB. Nous avons montré que l’UB est essentiellement associé à l’âge, le lieu de résidence et le type d’eau utilisé. Pour les sujets de 5 ans et plus, le risque d’UB est plus élevé chez les sujets vaccinés à la naissance avec le BCG. L’analyse par strate d’âge des sujets âgés de 5 ans et plus, nous a permis de voir que dans le groupe des 50 ans et plus l’influence du type d’eau utilisé est moindre que dans les autres groupes d’âge, laissant envisager qu’un autre facteur entre en jeu :une réactivation de la maladie à la faveur d’une baisse d’immunité. <p>Notre étude démontre que la prise en charge de l’UB doit être pluridisciplinaire et doit pouvoir englober diverses interventions telles que :<p>- les campagnes d’information à la population,<p>- la formation du personnel sanitaire ainsi qu’une implication de l’état,<p>- une bonne prise en charge des malades au niveau des centres de traitement de l’UB en collaboration avec les laboratoires régionaux et internationaux,<p>- la confirmation microbiologique des cas,<p>- la mise en place d’un suivi des malades en s’appuyant sur les structures déjà mises en place pour d’autres maladies,<p>- la mise à disposition des populations de sources d’eau potable (puits, pompes) qui par la même occasion permettront de limiter/diminuer d’autres affections liées à la consommation d’eau non potable,<p>- la poursuite des activités de recherche sur un éventuel vaccin ou une médication appropriée, ainsi que sur le réservoir de M. ulcerans afin de pouvoir mettre en place des stratégies de prévention de la maladie.<p> / Doctorat en Sciences de la santé publique / info:eu-repo/semantics/nonPublished
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Zhodnocení stability osteosyntézy po sagitální osteotomii větve dolní čelisti / Evaluation of the stability of osteosynthesis of mandibular ramus sagittal split osteotomyNieblerová, Jiřina January 2012 (has links)
Orthognatic surgery deals with congenital and acquired dentoalveolar or skeletal deformities of the face. An unfavourable downward rotation of a mandible and posterior vertical maxillary excess cause an anterior open bite, which is characterized by excessive anterior facial height in the lower third, a gap between the incisors in maximal occlusion and a large mandibular angle. Osteotomy (mainly Le Fort I osteotomy or bilateral sagittal split osteotomy of the mandibular ramus - BSSO), ostectomy or distraction osteogenesis are performed to correct the orthognatic deformities. Osteosynthetic materials based on titanium or bioresorbable materials are used in the form of miniplates with monocortical screws, or bicortical screws are utilized to fix the bony fragments. Stability of the new jaws position is the main criterion for success. Relapse causes a loss of occlusion and consequently functional and aesthetic disorders. Relapse consists of skeletal and dental factors. Skeletal relapse is usually divided into early and long-term relapse. BSSO with counter-clockwise (CCW) rotation of the occlusal plane alone was traditionally considered to be the least stable treatment method. Some authors suggest the use of two miniplates on each side of the osteotomy, but we have not found scientific proof of the...
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Börspsykologiska bias & Diversifiering : En kvantitativ studie om privatinvesterares beteende under Covid-19 / Psychological biases & Diversification : A quantitative study about private investors'behavior during Covid-19Lindström, Anton, Sara-Joyce, Jonsson January 2022 (has links)
Bakgrund: Coronapandemin präglade under lång tid människors vardag såväl som de finansiella marknaderna. Den kraftiga nedgången i februari - mars år 2020 och den rekordsnabba återhämtningen påverkade privatinvesterare. Dessa investerare stod inför tuffa beslut, och präglades av stress och oro. Under volatila tider sker inte alltid rationella beslut, och denna typ av beslutsmiljö kan påverka investerare att vara mer mottagliga av psykologiska bias. För att undvika att gå i samma fällor, är det av intresse att kartlägga börspsykologiska faktorers påverkan på privatinvesterares agerande och vilken effekt det har på deras diversifiering i aktieportföljen. Eventuella skillnader i agerande under börsnedgångarna visar även om investerarna själva lärde sig någonting från den första börsnedgången och ändrade sitt beteende till den andra börsnedgången. Syfte: Syftet med studien är att kartlägga privatinvesterares agerande på aktiemarknaden under Coronapandemin. Detta för att kunna uttala sig om, privatinvesterares beteende under börsnedgången i februari - mars 2020, samt den andra börsnedgången i oktober samma år. Genom att undersöka två tidsperioder går det att observera skillnader i beteende. Metod: Studien använde sig av en enkätstudie med tvärsnittsdesign för att på generell nivå ha möjlighet till att uttala sig om privatinvesterares agerande under börsnedgångarna. Slutsats: Studien har visat att samtliga undersökta börspsykologiska bias har påverkat privatinvesterare under båda börsnedgångarna men det finns dock skillnader mellan perioderna. Om respondenterna själva får beskriva deras agerande har många angett att de har agerat rationellt under krisen, något som tidigare forskning också konstaterat. Diversifieringen har ökat i aktieportföljen efter börsnedgångarna, jämfört med hur det såg ut vid slutet av 2019. Det är dock inte säkerställt att detta är en effekt av nedgångarna. Slutligen finns det även skillnader i börspsykologiska faktorer och diversifiering mellan demografiska faktorer och erfarenhet från tidigare kriser. / Background: The Corona pandemic has affected people’s everyday life as well as the financial markets. The big decline in the stock market that happened in February-March 2020 and the record fast recovery impacted private investors in a big way. Investors had difficult decisions to make during times of stress and worry, which does not always lead to optimal decisions. The investors could be more affected by biases during times of crisis. To avoid walking into the same traps again it is of investor’s interest to map psychological biases and how they affect the diversification in their stock portfolios. Eventual differences in behavior between the stock market decline in February-Mars and the one in October could be spotted by comparing the two periods. This would show if the respondents themselves learned from the first stock market decline to the second one, hence changing their behavior. Purpose: The purpose of this study is to map private investors’ behavior in the stock market during the Corona pandemic. This will make it possible to discuss private investors’ behavior during the stock market declines in February-March 2020 as well as the one in October the same year. This will make it possible to see differences in behavior. Method: The study used a survey study with cross-sectional design to be able to discuss private investors’ behavior at a general level. Conclusion: The study has shown that all studied psychological biases to affect private investors during the stock market declines, showing there are differences between these periods. If the respondents describe their own actions, then many of say themselves that they acted rational during the crisis, something that previous studies have shown. The diversification has also increased after the stock market declines compared to how it was at the end of 2019, but it is not certain that it is an effect of the stock market declines. There are also differences between demographic factors and experience from previous crises with regards to psychological biases and diversification.
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Assessment of Cranial Morphology and Function Underlying Dietary Diversity inCryptodiresCroghan, Jasmine A. January 2022 (has links)
No description available.
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A Pedagogy of Holistic Media Literacy: Reflections on Culture Jamming as Transformative Learning and HealingStasko, Carly 14 December 2009 (has links)
This qualitative study uses narrative inquiry (Connelly & Clandinin, 1988, 1990, 2001) and self-study to investigate ways to further understand and facilitate the integration of holistic philosophies of education with media literacy pedagogies. As founder and director of the Youth Media Literacy Project and a self-titled Imagitator (one who agitates imagination), I have spent over 10 years teaching media literacy in various high schools, universities, and community centres across North America. This study will focus on my own personal practical knowledge (Connelly & Clandinin, 1982) as a culture jammer, educator and cancer survivor to illustrate my original vision of a ‘holistic media literacy pedagogy’. This research reflects on the emergence and impact of holistic media literacy in my personal and professional life and also draws from relevant interdisciplinary literature to challenge and synthesize current insights and theories of media literacy, holistic education and culture jamming.
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A Pedagogy of Holistic Media Literacy: Reflections on Culture Jamming as Transformative Learning and HealingStasko, Carly 14 December 2009 (has links)
This qualitative study uses narrative inquiry (Connelly & Clandinin, 1988, 1990, 2001) and self-study to investigate ways to further understand and facilitate the integration of holistic philosophies of education with media literacy pedagogies. As founder and director of the Youth Media Literacy Project and a self-titled Imagitator (one who agitates imagination), I have spent over 10 years teaching media literacy in various high schools, universities, and community centres across North America. This study will focus on my own personal practical knowledge (Connelly & Clandinin, 1982) as a culture jammer, educator and cancer survivor to illustrate my original vision of a ‘holistic media literacy pedagogy’. This research reflects on the emergence and impact of holistic media literacy in my personal and professional life and also draws from relevant interdisciplinary literature to challenge and synthesize current insights and theories of media literacy, holistic education and culture jamming.
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