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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the 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.
91

Estudo da vascularização em mandíbulas de pacientes idosos edêntulos e dentados por meio da ultrassonografia modo B e Doppler / Study of vascularization in edentulous elderly patient\'s jaws and teeth by means of ultrasonography and Doppler mode B and Doppler

Marina Gazzano Baladi 12 December 2014 (has links)
Estudo elaborado para a investigação hemodinâmica das artérias alveolar inferior e mentual, relacionada com pacientes idosos edêntulos (totais e parciais) e dentados (com a presença do primeiro molar inferior bilateral), insento de doença oral e sistêmica, por meio da ultrassonografia modo B e Doppler, como forma de exame complementar. Por tratar-se de um método de diagnóstico preciso e confiável de visualização por meio de imagens, em tempo real, prontamente disponível, não invasivo, relativamente de baixo custo, inócuo, é uma importante ferramenta na avaliação de possíveis alterações da vascularização de diversos segmentos corpóreos, influenciando nas decisões clínicas, aumentando a precisão do diagnóstico complementar. Com o emprego do transdutor linear e endocavitário, de maneira intraoral, em 30 pacientes especificados acima, sendo 15 de cada grupo, foi mensurado as seguintes variáveis: IRV (índice de resistência vascular) o qual não sofreu efeitos de interação com lado (D e E), grupos (edêntulos totais e dentados) e artérias (AAI e AM), porém o ID (índice do diâmetro) e o VPS (velocidade de pico sistólico) apresentaram uma forte relação, isto significou que quando o valor de VPS aumentava no vaso estudado, o ID diminuía, ou seja a VPS e o ID se compensavam para manter a hemodinâmica constante, independentemente do lado (D e E) e do grupo (edêntulos e dentados), variando somente de artéria para artéria (AAI e AM). / Study prepared for the inferior alveolar artery hemodynamic investigation and mentual, related to edentulous and dentate elderly oral pathology free through ultrasonography and Doppler mode B, as a form of additional examination, because it is an accurate and reliable method of real time preview, readily available, non-invasive, relatively low-cost, innocuous, making it an important tool in the evaluation of possible changes in vascularity of various body segments corporals\' influencing clinical decisions by increasing the accuracy of diagnosis. With the use of linear array transducer and endocavity, of 30 patients specified above, being 15 from each group, in a way, intraoral were measured the following variables: VRI (vascular resistance index) which did not suffer the effects of interaction with side (R and L), groups (toothed and edentulous) and arteries (AAI and AM), however the ID (index of the diameter) and PSV (peak systolic velocity) showed a strong relationship, this meant that when the PSV value increased in the studied vessel, the ID decreased, i.e. the PSV and the ID they were compensating for to maintain constant hemodynamic, regardless of the side (R and L) and group (edentulous and serrated), varying only the artery to artery (AAI and AM).
92

Estudo da vascularização em mandíbulas de pacientes idosos edêntulos e dentados por meio da ultrassonografia modo B e Doppler / Study of vascularization in edentulous elderly patient\'s jaws and teeth by means of ultrasonography and Doppler mode B and Doppler

Baladi, Marina Gazzano 12 December 2014 (has links)
Estudo elaborado para a investigação hemodinâmica das artérias alveolar inferior e mentual, relacionada com pacientes idosos edêntulos (totais e parciais) e dentados (com a presença do primeiro molar inferior bilateral), insento de doença oral e sistêmica, por meio da ultrassonografia modo B e Doppler, como forma de exame complementar. Por tratar-se de um método de diagnóstico preciso e confiável de visualização por meio de imagens, em tempo real, prontamente disponível, não invasivo, relativamente de baixo custo, inócuo, é uma importante ferramenta na avaliação de possíveis alterações da vascularização de diversos segmentos corpóreos, influenciando nas decisões clínicas, aumentando a precisão do diagnóstico complementar. Com o emprego do transdutor linear e endocavitário, de maneira intraoral, em 30 pacientes especificados acima, sendo 15 de cada grupo, foi mensurado as seguintes variáveis: IRV (índice de resistência vascular) o qual não sofreu efeitos de interação com lado (D e E), grupos (edêntulos totais e dentados) e artérias (AAI e AM), porém o ID (índice do diâmetro) e o VPS (velocidade de pico sistólico) apresentaram uma forte relação, isto significou que quando o valor de VPS aumentava no vaso estudado, o ID diminuía, ou seja a VPS e o ID se compensavam para manter a hemodinâmica constante, independentemente do lado (D e E) e do grupo (edêntulos e dentados), variando somente de artéria para artéria (AAI e AM). / Study prepared for the inferior alveolar artery hemodynamic investigation and mentual, related to edentulous and dentate elderly oral pathology free through ultrasonography and Doppler mode B, as a form of additional examination, because it is an accurate and reliable method of real time preview, readily available, non-invasive, relatively low-cost, innocuous, making it an important tool in the evaluation of possible changes in vascularity of various body segments corporals\' influencing clinical decisions by increasing the accuracy of diagnosis. With the use of linear array transducer and endocavity, of 30 patients specified above, being 15 from each group, in a way, intraoral were measured the following variables: VRI (vascular resistance index) which did not suffer the effects of interaction with side (R and L), groups (toothed and edentulous) and arteries (AAI and AM), however the ID (index of the diameter) and PSV (peak systolic velocity) showed a strong relationship, this meant that when the PSV value increased in the studied vessel, the ID decreased, i.e. the PSV and the ID they were compensating for to maintain constant hemodynamic, regardless of the side (R and L) and group (edentulous and serrated), varying only the artery to artery (AAI and AM).
93

Response of the human jaw to mechanical stimulation of teeth

Brinkworth, Russell Stewart Anglesey January 2004 (has links)
Animal experiments indicate that the main form of feedback for jaw-closing muscles is from periodontal mechanoreceptors (PMRs). However, due primarily to limitations on methods, this is yet to be confirmed in humans. The main aim of this thesis was to investigate the reflex contribution of PMRs to the human jaws using vertical (axial) stimulation. To this end the electromyographic and bite force responses of the jaw to a number of different mechanical stimulus conditions, delivered to both the upper central incisors and the upper right first molars, were investigated. The principal hypothesis was that PMRs are responsible for the majority of the reflex responses seen in the human jaw muscles. Furthermore this reflex response is modulated by different characteristics of the stimulus such as: rate of rise, maximum force applied, the amount of constant offset force (preload), the level of muscle contraction and also the physical characteristics of the subject's jaw including: dental health and tooth spacing. These studies have contributed towards the understanding of the neuronal wiring and the receptor systems contained in the jaw. The results indicate that PMRs around the incisors are of fundamental importance for the development of reflex patterns but little if any PMR related reflexes exist around the molar teeth. The reflexes originating from the PMRs around the incisors are modulated by different mechanical characteristics of the stimulus, thus helping to explain how the jaw muscles perform numerous and complex patterns of activation which move the jaw in many different ways and develop forces that are optimum for the task at hand. / Thesis (Ph.D.)--School of Molecular & Biomedical Science, 2004.
94

On the role of number of fixtures, surgical technique and timing of loading /

Eliasson, Alf, January 2008 (has links)
Diss. (sammanfattning) Göteborg : Göteborgs universitet, 2008.
95

Using the jawed yet toothless Trp63 mouse mutant to understand the morphogenetic relationship between developing lower teeth and mandibles

2015 August 1900 (has links)
Across vertebrates, the coordinated evolution and synchronous development of teeth and the mandible must require specific timing and positioning of gene expression. While debate persists about whether teeth have evolved before or after mandible, currently, the consensus is that these systems evolved at separate times and thus have discreet origins. This raises an important question of whether tooth and mandibular tissues have over the course of their evolution become developmentally co-dependent or, as separate evolutionary origins would imply, remain developmentally autonomous of each other. The molecular signaling that patterns the genesis of upper versus lower jaw skeletons, as well as specifies tooth type (i.e., molar vs. incisor) is relatively well understood. To date, the distinct genetic processes that drive tooth development distinct from jaw skeletal development has been little-studied, in no small part due to the technical complexity of this task. The main hypothesis of thesis is that a collection of genes acting within a gene regulatory network (GRN) drives odontogenesis with neither input from, nor influence on, jaw morphogenesis. The Transformation Related Protein (TRP63) is a master transcription factor that is vital to odontogenesis because TRP63 maintains the competence and proliferation of the epithelial layer of the tooth organ. Thus the “toothless” TRP63 homozygote mouse mutant (Brdm2 mutant) fails to develop teeth even though it develops a virtually unperturbed mandible. This combination of lower jaw morphogenesis in the absence of odontogenesis presents a rare model to study the genetic changes that occur when teeth but not jaws fail to form. A previous microarray gene expression analysis (Boughner laboratory, unpublished data) of mandibular prominences (MdPs) derived from embryonic day (E) 10-13 revealed that, compared to heterozygote (Trp63+/-) MdPs, in Brdm2 mutant MdPs, transcript levels of cerebellin 1 (Cbln1); keratin 2-8 (Krt2-8); phospholipid transfer protein (Pltp) and fermitin 1 (Fermt1) were altered in at least some of the four embryonic stages. Specifically Cbln1 and Krt2-8 were up-regulated while Pltp and Fermt1 were down-regulated. None of these four genes have previously been linked to odontogenesis yet all are potential candidates for a “tooth-specific” GRN. Using RT-qPCR analysis, I aimed to test the validity of the microarray work and confirmed its veracity by showing that, generally, Cbln1 and Krt2-8 mRNA were up-regulated, while Fermt1 (but not Trp63 or Pltp) mRNA was significantly down-regulated in the MdPs of Brdm2 mutant mice relative to Trp63+/- mice. Conversely, western blotting protein expression analysis showed little-to-no change among Brdm2 MdPs relative to either wild type (Trp63 +/+) or Trp63+/- embryos, making it difficult to tease out the precise relationship between CBLN1, FERMT1, KRT2-8, and PLTP and TRP63. These results show a lack of strong correlation between mRNA and protein expression. Because the mRNA analyses showed disturbances in the expression level in a few of these five genes within the MdPs during the earliest stages of tooth development, these genes remain candidates for an odonto-specific GRN. In complement to the genetic work, to characterize the tandem developmental morphology of tooth and jaw skeleton tissues, my work included developing a new tissue staining protocol. Using Protargol, a silver-based compound, to enhance in uncut mouse embryos contrast among tiny, soft oral tissues and visualize their organization in 3D and microscopic detail across several embryonic stages. This novel protocol offers a simple, easy-to-follow, and relatively inexpensive way to effectively stain whole embryos aged E10-15 for X-ray based micro-computed tomography (μ-CT) imaging using synchrotron and desktop scanning systems. Because the scan data are digital, this new method also allows more precise, accurate and rapid empirical studies of the sizes, shapes and positions of teeth as they form within the jaw to clarify how these tissues are integrated as they develop. The work presented in this thesis investigated tooth development exclusive of mandible development from complementary molecular and morphological points of view. Driven by the lack of understanding of the genetic mechanisms that orchestrate tooth with jaw skeletal development, this study has for the first time isolated a set of genes that are potential candidates for tooth formation only. These results set the stage for next steps in testing the developmental-genetics that enable teeth and jaws to “fit” together as they develop.
96

Impact of breath group control on the speech of normals and individuals with cerebral palsy

Yip, Fiona Pik Ying January 2008 (has links)
Dysarthria is one of the most common signs of speech impairment in the cerebral palsy (CP) population. Facilitating strategies for speech enhancement in this population often include training on speech breathing. Treatment efficacy studies with cross-system measures in this population are needed for improved understanding and management of the interrelationship between respiratory, phonatory, and articulatory systems. The purpose of this study was to investigate the effect of breath group control on the coordination of articulatory and phonatory muscles and the acoustic measures related to speech and voice quality. A simultaneous acoustic, electroglottographic (EGG), and marker-based facial tracking recording system was employed to monitor the speech production behaviors of four adults with CP and 16 neurologically healthy controls. Subjects were instructed to perform three tasks, each containing speech targets with a voiceless plosive (/p/, /t/, or /k/) preceding a vowel (/i/, /a/, /u/, or /ɔ/). Task 1 consisted of a short reading passage embedded with target vowels without cueing from breath group markers. Task 2 included reading a series of monosyllabic and 3-syllable or 5-syllable non-speech words with the speech targets. Task 3 included reading the same short passage from Task 1 with cueing from breath group markers separating the passage into phrases with no more than five syllables per phrase. Measures from the acoustic, EGG and facial tracking recordings of the first and last syllable of all syllable trains produced in the non-speech task and the target vowels in the passage reading task were examined. Acoustic measures included voice onset time (VOT), vowel duration, fundamental frequency (F0), percent jitter (%jitter), percent shimmer (%shimmer), signal-to-noise ratio (SNR), and frequencies of Formants one and two (F1 and F2). EGG measures included speed quotient (SQ) and open quotient (OQ). Facial tracking measures consisted of maximum jaw displacement. Individual and averaged data were submitted to a series of two-way Analysis of Variances (ANOVAs) or two-way Repeated Measures ANOVAs to determine the effects of the relative position of an utterance in the breath group and the place of articulation of the consonants involved. In addition, mean vowel spaces derived from all three tasks were examined. Results revealed significant changes of VOT, F1, F2, SNR and SQ as a function of position. Significant changes of VOT, vowel duration, F2, F0, %jitter, %shimmer, and maximum jaw displacement as a function of place of articulation were also evident. In particular, breath group control was found to result in expansion of vowel space, especially for individuals with CP. These findings suggest that proper phrasing enhances articulatory and phonatory stability, providing empirical evidences in support of its usage in treating individuals with CP.
97

Neck function in rhythmic jaw activities /

Häggman Henrikson, Birgitta January 2004 (has links)
Diss. (sammanfattning) Umeå : Univ., 2004. / Härtill 6 uppsatser.
98

Introducing and integrating silence into the divine service at Emmanuel Lutheran Church, Moose Jaw, Saskatchewan

Kreutzwieser, John R., January 2006 (has links)
Thesis (D.W.S.)--Institute for Worship Studies, 2006. / Includes bibliographical references.
99

An immunohistochemical study of idiopathic histiocytosis of the jaws a thesis submitted in partial fulfillment ... oral pathology and diagnosis ... /

Stewart, Jeffery C. B. January 1985 (has links)
Thesis (M.S.)--University of Michigan, 1985.
100

A comparison of static and graphic means of recording sagittal condylar guidance

Berg, James E. January 1983 (has links)
Thesis (M.S.)--University of Michigan, Ann Arbor, 1983. / Typescript (photocopy). Includes bibliographical references (leaves 45-48). Also issued in print.

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