Dissertations / Theses on the topic 'Teesta'
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Acharjee, Manik Lal. "Diversity of plankton and ichthyofauna in relation to limnochemistry of river Teesta and Relli in the Darjeeling Himalaya of West Bengal." Thesis, University of North Bengal, 2013. http://hdl.handle.net/123456789/944.
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Chhetri, Harka Bahadur. "An Ecological study of the vegetation of Teesta sub-catchment area (South Sikkim) with special emphasis on the utilization of the local species for Eco-restoration and Eco-development of the region." Thesis, University of North Bengal, 1991. http://hdl.handle.net/123456789/1562.
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Rahman, Md Azizur. "Water scarcity-induced change in vegetation cover along Teesta River catchments in Bangladesh : NDVI, Tasseled Cap and System dynamics analysis." Thesis, Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-89778.
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Water scarcity is both natural and man-made phenomenon. Water control and uneven distribution of upstream TeestaRiver water makes artificial scarcity in downstream areas which can be minimized at least to the water stress level by balancing distribution and sustainable water use. Tasseled Cap transformation and NDVI methods were used in this study in order to find the magnitude of water scarcity in the downstream areas. NDVI and Tasseled Cap Greenness methods were applied to get proxy for soil moisture values in the form of biomass content and Tasseled Cap Wetness method were used to detect change in soil moisture content from Landsat TM and ETM+ data (1989-2010). System dynamic analysis method was applied to identify temporal and spatial differences between supply and demand of water in the TeestaRiver catchments area in the northwestern part of Bangladesh. It was found that, the vegetation cover and soil moisture content changed and shifted over time. Overall vegetation declined between 1989 and 2010 and soil moisture content also turned down. Moreover, TeestaRiver water is playing an important role for maintaining the balance between water supply and water scarcity in this region. There is a correlation between water scarcity in the downstream and availability of water in the TeestaRiver during dry seasons.Master's Thesis
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Lambert, Dan. "Waterloo Teeth." Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1403626480.
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Yanga-Mabunga, Maria Susan T. "Social impact of oral diseases and disorders among Filipino and Australian workers /." Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09DSM/09dsmy22.pdf.
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Handwerger, Alexandra M. "Teeth and Other Tales." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/572.
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TEETH AND OTHER TALES is a novella and a collection of short stories that explore the blurry lines between illusion and reality.
Teeth, the novella, is narrated backward in time, chronicling the life of Lucy from the age of sixty-five back to seventeen. After years of surviving an oppressive marriage, Lucy escapes her husband, but in doing so abandons her three children. In order to rationalize her decisions, Lucy uses selective memory to create her own reality to the extent that she comes to believe her own delusions.
The four short stories in the collection feature protagonists who create their own personal myths and struggle to protect their distorted truths, with mixed results. These struggles between the “real,” as conventionally defined, and personal fictions are complicated by elements of magical realism and surrealism. The stories were influenced by the short fiction of Nikolai Gogol, Franz Kafka and Haruki Murakami.
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Lu, Dun. "Nanomechanics of limpet teeth." Thesis, Queen Mary, University of London, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538665.
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Cristine, Hedlund, and Alexander Tasevski. "Design of bucket teeth." Thesis, Mälardalens högskola, Innovation och produktrealisering, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-33079.
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For many years, buckets have been equipped with teeth to help penetrate, gouge and breakout materials. The teeth also works as wear parts and can be replaced when they are worn down, and thus increase the service life of the bucket. The first teeth were made like a one-piece design and to replace such tooth required both cutting and welding which was very time consuming. Today’s modern teeth consist of an adapter that is welded on the bucket and a tooth with a locking system that makes it easy to replace the tooth when needed. The teeth on the market today are cast, which means that the hardness cannot be guaranteed through the whole cast and the hardest tooth is measured to be around 500 HB. SSABs brand Hardox is the toughest steel on the market. It is extremely wear resistant and has a three time longer service life than ordinary steel. To increase the use of Hardox the possibility to manufacture bucket teeth of three or more plates are examined. This thesis has applied a product development process to mainly develop concepts of the locking system that holds the adapter and tooth together. The locking systems main requirement is to be hammerless, meaning that it is not hammered in, due to the high risk of injury and longer assembly time. Apart from, the geometry of the tooth will be developed to give a better wear resistance. The result is a tooth with at least twice as long service life than the cast competitors and two concepts of locking system. Both locking systems meet the requirement of being hammerless and the sustainability is ensured with calculations of shear force. The geometry of the tooth is design to be self-sharpening, which allows it to stay sharper throughout its service life. Wear test using DEM analysis assure a positive outcome.
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Mahoney, Erin Kathleen. "Erosion Of Primary Teeth." Thesis, Faculty of Dentistry, 2009. http://hdl.handle.net/2123/4612.
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Jordao, Clarissa Menezes. "The skin of our teeth." [s.n.], 2010. http://hdl.handle.net/1884/24348.
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Ball, Rhiannon. "I sowed the dragon's teeth." Thesis, Aberystwyth University, 2017. http://hdl.handle.net/2160/fbf03e5a-9441-44a6-addf-30664f818060.
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Karl König’s model represents how community shapes the individual, and in turn the individual shapes community. It thereby begins to express the complexities and interdependences of a successful journey into life, and the ‘layering’ of a human biography which is inevitably shared with, and influenced by, others. The novel, I Sowed the Dragon’s Teeth, is structurally organised under character symbols which follow König’s defined social layers: family; village, district, street; the community of language; and humankind. The final chapters repeat the symbol of family, as an indication that the processes of growth and development; of both character and plot; are cyclical or multidimensional. The narrative itself demonstrates how a person’s social development is not completely linear, rather a process often returning to its origins. This critical commentary is similarly organised to reflect these layers of social development and equally seeks to connect and comment upon them as a whole. As König’s work, in areas of both philosophy and sociology, is an important area of inspiration for the creative and critical aspects of my own, the approach of this thesis is necessarily interdisciplinary in nature. While it draws from the work of other fiction writers, it is equally grounded in areas of human science. The effect is one in which characters and events can be analysed in their own right, but also through the lens of real human experience. As much of the novel’s historical aspects are researched and grounded in real human history, this further proves a more insightful approach. Consequently a diverse range of terminology, sources and further reading importantly inform the discussion of this work. The work of Rudolf Steiner notably influences some of the theoretical arguments put forward in this commentary. His ideas concerning a reexamination of the relationship between the individual and the rest of humankind were instrumental in prompting my own. Indeed, Steiner’s unique insights into the responsibilities of any community to its individual members, prompted my interest both in intentional communities as a vehicle for social reform, and the setting for a novel. In the novel, Dyffryn Tŷ Farm can be seen as just such a vehicle. In contrast to the exclusive vehicle Craddock and Walter seek to propel, tangibly, into the future, the members of Dyffryn Tŷ utilise interaction with individuals, such as Miao, to inclusively disseminate alternate social ideas ... Readership for I Sowed the Dragon’s Teeth is partly intended for an adult audience interested in these philosophical, sociological and historical inspirations. That is, adults interested in initiatives for social change, chiefly the Camphill Movement; WWII historical fiction; and fiction inclusive of central characters with disabilities. To a greater degree, the novel is intended as a work of young adult fiction, due to archetypal themes of friendship, getting into trouble, familial struggles, and concern over identity.
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Bassil, Jean. "Prosthetic management of deciduous teeth." Master's thesis, [s.n.], 2015. http://hdl.handle.net/10284/5065.
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Projeto de Pós-Graduação/Dissertação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Mestre em Medicina DentáriaIntroduction: Situations of single or multiple edentulous are not an exception during childhood. Prosthetic management is necessary in case of absence of replacing tooth or when its eruption is planned too far in time. Indications of prosthetic rehabilitation for children are multiple and rise from the etiologic factors causing the situations of edentulous or loss of normal dental relation. These factors can be acquired or congenital. Prosthetic restorations aim to restore esthetics and to maintain masticatory and phonetic functions as well as the length of the arcade and the vertical dimension of occlusion. The other objectives are to prevent a possible psychological trauma due to loss of the teeth and the appearance of bad habits such as the interposition of the tongue and the maintenance of infantile swallowing. In their daily practice, dentists are often confronted with edentulous situations and in order to provide optimal care for his patients, dentist should opt for a suitable therapeutic choice. Objective: This literature review aim to enumerate and describe the different treatments for dental loss in children and their respective indications. Treatments include fixed or removable prosthetic rehabilitation. Materials and methods: For this purpose a research has been done and data was obtained from online resources: Scielo, Medline, Bireme, Pubmed, Bon, books and specialized magazines which was conducted between December 2014 and June 2015. The key words used were temporary denture, eruption and occlusion in temporary denture, eruption in permanent denture, caries and tooth loss etiologies, space maintainers, prosthetic management in temporary teeth. Conclusion: Prosthetic rehabilitation in children is an essential therapeutic which must be implemented in the earlier stage in the earlier stage and according to the child’s abilities and monitoring must be done over several years. Introdução : Situações de falta de um ou mais dentes não são raras durante a infância. A colocação de uma prótese pode ser necessária para a substituição dos dente ou quando para a sua erupção ainda falta algum tempo. As indicações de reabilitação protética para as crianças são múltiplas e os fatores etiológicos que causam as situações de perda de dentes ou perda de relação dentária normal, aumentam. Esses fatores podem ser adquiridos ou congênitos. As restaurações protéticas visam estabelecer a estética e manter as funções mastigatórias e fonéticas, bem como o comprimento da arcada e da dimensão vertical de oclusão. Outros objectivos são evitar um possível trauma psicológico, devido à perda dos dentes e ao aparecimento de maus hábitos, tais como, a interposição língual e a manutenção da deglutição infantil. Diariamente, os dentistas são muitas vezes confrontados com pacientes desdentados e a fim de proporcionar os melhores tratamentos para seus pacientes, devem optar por uma reabilitação adequada. Objetivo : Esta revisão da literatura tem como objetivo enumerar e descrever os diferentes tratamentos e suas respectivas indicações, para a perda dentária em crianças. Os tratamentos incluem reabilitações protéticas fixas ou removíveis. Materias e metodos : A pesquisa foi feita com recurso a bases de dados online: Scielo, Medline, Bireme, Pubmed, Bon, livros e revistas especializadas, entre os meses de dezembro de 2014 e junho de 2015. As palavras-chave utilizadas foram dentição decídua, erupção e oclusão na dentição decídua, etiologias da cárie e da perda dentária, mantenedores de espaço, prótese dentária para dentes decíduos. Conclusão : A reabilitação protética em crianças é uma terapêutica essencial que deve ser implementado na fase precoce e de acordo com a prática do medico dentista e o acompanhamento da criança deve ser feito ao longo de vários anos.
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Qirreish, Emad Eddin Yacob Juma. "Radiographic profile of symptomatic impacted mandibular third molars in the Western Cape, South Africa." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&.
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It is common practice to remove impacted mandibular third molars due to pathology associated with these impactions. Alternatively, impactions can be treated conservatively through a closely guarded follow-up regiment. However, many symptoms associated with impacted third molars may be prevented by elective removal of potentially problematic teeth. To determine the risk of developing pathology associated with impacted mandibular third molars, a ransom sample of 200 pantomographs were analyzed displaying 324 impactions from patients who presented for treatment at the Maxillo-Facial and Oral Surgery Department, Faculty of Dentistry, University of the Western Cape.
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Prey, Ann. "Effectiveness of a professional bleaching product on the four shade ranges of teeth enamel." Menomonie, WI : University of Wisconsin--Stout, 2005. http://www.uwstout.edu/lib/thesis/2005/2005preya.pdf.
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Ramírez, Sebastià Anaïs. "Reconstruction of endodontically treated anterior teeth." Doctoral thesis, Universitat Internacional de Catalunya, 2014. http://hdl.handle.net/10803/146257.
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L’objectiu d’aquesta tesis es va centrar en la restauració de les dents endodonciades en el sector anterior. Es va evaluar l’adaptació marginal, la resistencia a la fractura, i el tipus de fractura entre dents anteriors restaurades amb endocorones de composite i ceràmica, i corones de ceràmica i composite amb prèvia col.lcació de postes de fibra de 5mm o 10mm de longitud.
32 incisius centrals anteriors van ser dividits en 6 grups experimentals. 1) Poste llarg + munyó de composite + corona CAD/CAM de ceràmica, 2) Poste curt + munyó de composite + corona CAD/CAM de ceràmica, 3) Poste llarg + munyó de composite + corona CAD/CAM de composite, 4) Poste curt + munyó de composite + corona CAD/CAM de composite, 5) Endocorona de ceràmica, 6) Endocorona de composite.
Una vegada restaurades les dents, es van carregar sobre una superfície palatina amb una angulació de 45 graus seguint l’eix longitudinal de l’arrel a la màquina de fatiga realitzant 600.000 cicles mecànics a una força de 49N i 1500 cicles termals entre 5 i 55ºC. Abans i després de la prova de fatiga es van realitzar rèpliques de cada mostra per analitzar les dues interfases adhesives externes (Dentina-Ciment i Ciment-Corona) mitjançant un “Microscopio Óptico de Barrido” (SEM) a 200x de magnificació. Es va evaluar així la continuïtat (C) o no continuïtat (MO) de cada interfase.
Posteriorment cada dent es va col.locar a un suport de 45º i es va aplicar una força controlada amb una bola d’acer inoxidable. La pressió es va localitzar 3mm per sota de l’eix incisial a la superfície palatina de la corona a una velocitat màxima de 1mm/min. Totes les mostres es van carregar fins aconseguir la seva fractura amb Newtons (N). Els tipus de fractura es van analitzar i es van classificar com a fractura reparable o no reparable o catastròfica. Les fractures a la part inicisal de l’arrel, al munyó i la descimentació del poste es van valorar com a reparables i les fractures per sota, no reparables.
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Lin, Jack Cheng-Wei, and n/a. "Electric pulp testing of molar teeth." University of Otago. School of Dentistry, 2007. http://adt.otago.ac.nz./public/adt-NZDU20071221.140417.
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Testing the vitality of teeth using electric pulp testers was reviewed. Two studies then investigated aspects of the application of electric pulp testing (EPT) to healthy first molar teeth.
Twenty volunteers with first molars free of restorations and caries were recruited. One molar from each arch was selected and rubber dam applied. The tester probe was coated with fluoride gel. Seven sites on each crown were EPT tested four times, and all threshold responses recorded. Data were analysed using one way ANOVA at the 0.01 level. The lowest response for both the maxillary and mandibular teeth was with the probe on the mesio-buccal cusp tip. Males responded at a lower level than females at the mesio-buccal cusp tip, but this did not reach statistical significance.
The relationship between pulp areas and dimensions on radiographs and the EPT results was investigated. Standardised bitewing radiographs of the tested molars were mounted and digitally scanned. Five measurements were taken using a computer program; crown width, the mesial and distal pulp horn heights, the area of the clinical crown, and the pulp area in the clinical crown. The four electrode placement sites with the lowest threshold from the pulp testing results were selected. Pearson correlations (2-tailed) were used to relate the measurements. There were no correlations between the coronal pulp size, pulp horn height and the probe placement site. The exception was an anomalous correlation between the distal horn height and mesio-buccal cuspal area of the maxillary molars.
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Anthonappa, Robert Prashanth. "Prediction of supernumerary teeth in children." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47849605.
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Supernumerary teeth are teeth in addition to the normal complement of 20 primary and 32 permanent teeth. The majority of these supernumerary teeth are conical shaped, assume an inverted orientation and remain un-erupted. Therefore, radiographic examination is considered critical for the identification of supernumerary teeth. A meta-analysis to determine the variations in the prevalence figures based on the diagnostic tools employed revealed that a clinical examination plus selected radiograph(s) are essential for determining the prevalence of supernumerary teeth; the vast disparities in the quoted prevalence of supernumerary teeth make their value questionable. Therefore, the reliability of panoramic radiographs and the influence of the level of dental training of the 18 examiners for identifying supernumerary teeth were evaluated, which demonstrated that panoramic radiographs are unreliable as a diagnostic tool, and that a high level of dental training is essential for the identification of supernumerary teeth. Based on the sensitivity figures for panoramic radiographs the prevalence of supernumerary teeth was re-analyzed and this demonstrated that the prevalence figures are higher than reported in the literature, ranging from 2.4% to 6%, or even higher; thus, indicating the need for new diagnostic tools for the identification of supernumerary teeth.
Proposed hypotheses and recent molecular research, using animal models to gain new insights into the development of supernumerary teeth, have been unable to identify the etiology of supernumerary teeth. Based on the existing published reports and an additional 10 familial cases, the only definitive factors is that supernumerary teeth have a genetic component to their etiology. To identify the genetic risk factors responsible for the formation of supernumerary teeth large scale genetic epidemiological studies, with efficient and convenient methods for obtaining sufficient genomic DNA from study participants, are essential. Evaluation of the storage stability of saliva at room temperature, over an 18-month period, did not adversely influence the DNA yield and purity, or the genotyping efficacy; which clearly demonstrates that saliva is a possible alternative to blood as a source of human DNA.
Supernumerary teeth are commonly associated with cleidocranial dysplasia (CCD), a genetic disorder affecting the skeletal system. Novel identical compound heterozygous mutations were identified in the RUNX2 gene of a southern Chinese family with CCD, which has been the first report of compound heterozygous mutations in CCD patients.
Several mouse mutant genes have reported an association with supernumerary teeth; most of these genes have human orthologs. A case-control association study was performed to determine the role of human orthologs of the mouse mutant genes associated with supernumerary teeth in 457 southern Chinese children. DNA samples were obtained and 140 single nucleotide polymorphisms (SNPs) from 19 genes were genotyped. The findings revealed that polymorphisms on SNPs rs17619858 and rs12699798, in the sclerostin-domain containing-1 (SOSTDC1) gene on chromosome 7, were associated with the development of supernumerary teeth in the anterior region of the maxilla. This dogma of genetic risk assessment for early diagnosis facilitates the implementation of the proposal of Genetic Risk Assessment for Personalized Health and Individual Care (GRAPHIC) concept in dentistry.published_or_final_version
Paediatric Dentistry
Doctoral
Doctor of Philosophy
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James, Patrick R. "Natural #alpha#-radionuclides in children's teeth." Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299336.
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Beavers, Charles M. "Restorative Characteristics of Intrapulpally Cracked Teeth." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3713.
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Cracked teeth have long presented a diagnostic challenge. Previous investigators have considered possible predictive factors, many of which revolve around the tooth’s restorative characteristics. Few have investigated the restorative status of teeth with cracks extending into the pulp chamber. The purpose of this investigation was to determine the prevalence of the different types of restorations present in intrapulpally cracked teeth and determine any other restorative factors that may aid in predicting the presence or extent of an intrapulpal crack. Intrapulpally cracked molars requiring endodontic therapy at the VCU Graduate Endodontic Practice were included in this study. For each tooth, the type of restorative material present and surfaces involved were recorded. The Restoration Volume Proportion (RVP) was calculated to accurately quantify the size of the restoration present. Pulpal and periapical diagnoses, and intrapulpal crack classification were also recorded. Chi squared analysis and logistic regression were used to determine any significant associations. This study included 43 teeth. The study population was 65% female and the average age was 56. Of the various restoration types evaluated, 73% of teeth presented with amalgams, 12% with composites. Class I restorations were 61% of the sample. The most frequently occurring restoration size by volume was a “small” restoration. The most commonly involved teeth were the maxillary 1st molar and mandibular 2nd molar. A significant association was found between restoration size and crack classification suggesting that teeth with larger restorations had a higher incidence of coronal cracks while those with smaller restorations had a higher incidence of radicular cracks. Restoration classification and pulpal walls involved were also significantly associated suggesting that Class II restorations were most frequently associated with cracks involving a single pulpal wall while Class I restorations were evenly associated with one and two wall cracks. Other significant associations were found between tooth type and pulpal walls involved and between restoration surfaces and pulpal wall classification. This study found several significant associations between restoration characteristics and intrapulpal cracks. Further research may continue to reveal how a tooth’s restorative status may influence its risk for the presence of an intrapulpal crack.
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Springbett, Susan. "Tooth wear in the deciduous dentition : a cross cultural and longitudinal study /." Title page, contents and abstract only, 1998. http://web4.library.adelaide.edu.au/theses/09DM/09dms769.pdf.
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Walker, Richard Thomas. "A comparative investigation of the root number and canal anatomy of permanent teeth in a Southern Chinese population." Thesis, [Hong Kong : University of Hong Kong], 1987. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12335423.
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Day, Samantha L. "Gritting Teeth: A Memoir of Unhealthy Love." TopSCHOLAR®, 2010. http://digitalcommons.wku.edu/theses/230.
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Originally intended to be modeled after Eula Biss’s creative nonfiction essay “The Balloonists”—which tackles the subject of marriage via fragmented prose poems— “Gritting Teeth: A Memoir of Unhealthy Love” is a piece that has taken on a subject and form of its own. A memoirist like Vivian Gornick might not claim the writer’s piece, as it hesitates to offer a “story” in places. A memoirist like Sue William Silverman might not claim the piece, as it hesitates to be courageous at times. But this collage of song lyrics, research snippets, and even Craigslist postings works in conjunction with fragments from the writer’s two most “serious” romantic relationships, as well as fragments from her more recent romantic past, to create a piece that has given her an awareness of the unhealthy relationship behaviors she possesses, and with that, a tinge of hope for changing these behaviors in the future. To the woman who’s ever been obsessive about a boyfriend (or even a fling), the woman who’s married for ulterior motives, or the woman/man interested in peering into the recesses of a neurotic, obsessive, and generally warped female mind, the writer offers this memoir.
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Middleton, F. "Romanticism with teeth : surrealism in British film." Thesis, University of York, 2016. http://etheses.whiterose.ac.uk/14243/.
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This thesis explores the idea of Surrealism in relation to British films. Films often classified as Realism, Gothic, Satire or Artists’ Film and Video are revealed to contain substantial collective themes and techniques when looked at through the lens of Surrealism, while films that have not previously been associated with Surrealism are found to be significant. Detailed case studies of Neil Jordan’s The Company of Wolves (1984) and Mona Lisa (1986) reveal that these two films embody these themes and techniques and straddle the perceived polarity of realism and fantasy in British film. Central to the discussion is Viktor Schlovsky’s idea of de-familiarization whereby that which is so familiar as to go unquestioned is made shockingly unfamiliar or strange. The thesis challenges the idea of mutually exclusive genres in British cinema, particularly Realism and its perceived opposites, ideas that have long-defined British Cinema studies. Conversely, Surrealism’s ultimate aim is the convergence of reality and fantasy or the imagination, and this thesis demonstrates that convergence within British Cinema. The thesis also builds bridges between British Cinema studies and disciplines such as Literature and Art History, as well as other European Cinemas. A major finding is that Surrealism’s roots in Romanticism are often played out in British films, and subversive narrational techniques are traced from eighteenth and nineteenth century Gothic novels to Lewis Carroll and the films of Luis Buñuel and British Cinema. There is however an important difference between Romanticism and Surrealism: the first is characterised by self-expression, which can often be controversial, without concern for consequences. Surrealism on the other hand is very much concerned with consequences, as in its hands self-expression becomes a means of protest, aimed squarely at shattering oppressive socio-political circumstances.
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Ferrari, Claudia. "Guarana-soft drinks, acids, pain and teeth." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=107885.
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INTRODUCTION: Deciduous and permanent teeth differ in shape and calcium content. Deciduous enamel and dentin are thinner and softer than permanent teeth. Chronic, frequent imbibing of acidulated pop-drinks imbibing is erosive, and dentinal pain occurs after rinsing with acidulated pop-drinks. Since calcium and phosphorous leach from teeth with acid drinks, we investigated pop-colas and pop-guaraná for pain sensitivity and erosion in adults and children. AIM: This research assessed (i) in vitro, the pH buffering, calcium, phosphorous and fluoride content of pop-guaraná and pop-colas. This research compares (ii) in situ scanning surface electron microscopy (ESEM) of granular hydroxyapatite crystals (HAP), enamel, dentin and enamel-dentin junctions (AMCJx) after exposure to pop-colas and pop-guaraná. This research reports (iii) in vivo calcium and phosphorous, leached from children and adults derived from erosion after swishing with pop-colas and pop-guaraná. This research assesses (iv) in vivo pain in children and adults after swishing with pop-colas and pop-guaraná. METHODS: Six pop-colas (3 regular; 3 diet) and six pop-guaraná drinks (4 regular; 2 diet) were tested pH, buffering capacity, calcium, phosphorus and fluoride concentrations using standard chemical analytical methods: ICP-OES for calcium and phosphorous, and a Single Orion Electrode for fluoride, coupled to an automated electronic digital recorder. Scanning surface electron microscopy (ESEM), without metal coating, was used to examine calcified samples. The same precise microscopic locations were used for visual comparisons. Three cohort volunteers (adult dentate, adult edentulous and children dentate) swished aliquots of drinks for 30s. Each drink had readings recorded 72 times. Six colas and six guaraná drinks from source and mouth rinse were tested for calcium and phosphorous. VAS scales were used for comparisons of pain for each drink. RESULTS: Data showed significant (p < .0001) increases of calcium and phosphorous after rinsing with colas and significantly less (p < .0001) leaching after rinsing with guaraná. Guaraná induced less pain than colas. Children show more erosion with rinsing colas than guaraná, but less pain after cola rinsing than adults. Little pain with guaraná rinses was recorded in children. All guaraná pop-drinks have fluoride content, with a range from concentration at 0.8 ppm F- to 1.6ppm F. CONCLUSION: While both colas and guaraná are erosive to teeth and cause pain in adults and children, pop-colas are more erosive than guaraná in children, and colas induce more dentinal pain in adults than in children. Fluoride in the drink may modulate the erosion. ESEM evidence shows guaraná pop drinks demonstrate marked visual increases in mordant changes of HAP and the hard tissues of teeth. Some pop-guaraná drinks are less erosive than others are. KEYWORDS: Acid, attrition, abrasion, beverages, buffering, calcium, phosphorus, guaraná, erosion, teeth.RésuméINTRODUCTION : Les dents décidues et les dents permanentes diffèrent par leur forme et teneur en calcium. L'émail et la dentine de dents décidues sont plus minces et moins dure que les dents permanentes. Si utilisée de façon chronique, souvent l'ingestion de boissons gazeuses acidulées est érosive, et la douleur dentinaire se produit après rinçage à boisson gazeuse acidulée. Étant donné la perte de calcium et de phosphore découlant de L'ingestion des boissons acides, nous avons étudié des boissons gazeuses colas et guaraná pour La sensibilité à la douleur et l'érosion. OBJECTIF: Cette recherche a évaluée: (i) in vitro le pH, le pouvoir tampon, le calcium, le phosphore et la quantité de fluorure des boissons gazeuses guaraná et colas, (ii) la comparaison des données in situ: - Surface de microscopie électronique à balayage: cristaux d'hydrox apatite granulaire, émail, dentine, l'émail -dentine jonction (AMCJx) (iii) in vivo la perte de calcium et de phosphore chez enfants et chez adultes pour l'érosion avec des boissons gazeuses colas et de guaraná, et (iv) la douleur après le rinçage. MÉTHODES: Six boissons gazeuses colas (3 régulières; 3 diètes) et six boissons gazeuses guaraná (4 régulières, 2 diètes), ont été testées le pH, le pouvoir tampon, le calcium, phosphures et le fluorure ont été mesurées dans le guaranás. En utilisant des méthodes chimiques classiques d'analyse; ICP-OES pour le calcium et le phosphore et un unique Orion électrode pour le fluorure, couplé à un enregistreur numérique automatisé électronique. Trois cohortes de bénévoles, (la première des adultes dentées, la deuxième des adultes édentés, et la troisième des enfants dentées); rinçage des aliquotes de boissons pendant 30s. Chaque échantillon a été analysé, des mesures ainsi que des moyennes ont été enregistrées (α ÷ 6 = β où α a été la lecture et β la moyenne); 12 échantillons de chaque boisson ont été enregistrés (β X 12 mesures pour toutes les boissons) pour chaque boisson appréciée. En conséquence, chaque boisson a eue des lectures enregistrées pour un total de 72 fois, toutes avec des méthodes standards préétablies. Colas de la source et pos rinçage ont été testés pour le calcium et le phosphore. Des échelles EVA ont été utilisées pour les comparaisons de la douleur, (notes initiales et pos rinçage pour chaque boisson). Chaque analyse a été vérifiée comme décrite pour les six guaraná évaluées. RÉSULTAT: Les données ont montré une augmentation significative du calcium et du phosphore après rinçage avec les colas et beaucoup moins après rinçage avec le guaraná. Le Guaraná cause moins de douleur que les colas. Les enfants montrent une plus grande érosion lors du rinçage avec l'utilisation de cola par rapport le guaraná, mais moins de douleur. Cependant les enfants accusent moins de douleur après rinçage avec cola que les adultes. Chez les enfants, le rinçage avec le guaranás a produit peu de douleur. Toutes les boissons gazeuses à base de guaraná ont une quantité en fluorure. La boisson gazeuse Kuat montrant la plus faible concentration à 0,8ppm F- tandis que l'Antarctica et la régulière Mineiro sont a plus de 1,6ppm F-. CONCLUSION: Bien que les deux colas et le guaraná sont érosifs sur les dents et causent de la douleur chez les adultes et chez les enfants, les boissons gazeuses colas sont plus érosives que le guaraná chez les enfants, et les colas provoquent plus des douleurs dentinaires chez les adultes que chez les enfants. Le fluorure dans la boisson peut moduler l'érosion. La preuve ESEM démontre que les boissons gazeuses au guaranás. Dénotent une augmentation marquée de changements visuels concernant le occlusal/bord incisif de HAP et de tissus durs des dents. Guaraná Mineiro cause moins de dommages par rapport à toutes les boissons gazeuses guaraná testées. MOTS-CLÉS: acides, de l'attrition, l'abrasion, des boissons, le pouvoir tampon, le calcium, le phosphore, le guaranás. , l'érosion, dents.
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Janjua, Sharif F. N. "Orthodontic treatment for crowded teeth in children." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3008064/.
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Background: Crowded teeth develop when there is not enough space in the jaws into which the teeth can erupt. This gives the patient crooked or wonky teeth and cause them to present for treatment. Crowding can affect the baby teeth (primary dentition) and/or the adult teeth (permanent dentition). Crowding tends to increase with age, especially in the lower jaw, so that only a third of adults have well aligned lower front teeth (incisors)1. Crowding of the adult teeth can also occur when space is lost following the early loss of baby teeth either as a result of tooth decay or trauma. The Cochrane Oral Health Group undertook an extensive prioritisation exercise in 2014 to identify a core portfolio of titles that were the most clinically important ones to maintain on the Cochrane Library and this review was identified as a priority title by the orthodontic expert panel. Objectives: To test the null hypotheses that there are no differences in outcomes between 1) the age at which orthodontic treatment for crowded teeth is carried out; 2) different orthodontic interventions for correcting/preventing crowded teeth against the alternative hypothesis that there are. Search methods: We searched the following databases were searched up to July 2016: Cochrane Oral Health Group's Trials Register, Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library), MEDLINE, EMBASE. No restrictions were placed on language or date of publication when searching databases. Selection criteria: We included randomized controlled trials (RCTs) on any active interventions such as orthodontic braces (removable, fixed, functional), head-braces or extractions, against controls of no treatment, delayed treatment or another active intervention. The studies included had at least 80% of participants aged 16 years old and under. Data collection and analysis: Two reviewers independently extracted information regarding methods, participants, interventions, outcomes, harms and results, independently and in duplicate. The Cochrane risk of bias tool was used to assess the methodological quality of the studies. Main results: 19 RCTs were identified which included 1,101 participants. A meta-analysis was carried out on four papers, two that compared copper NiTi to NiTi and two that compared vibrational appliances to controls. No difference was found between either type of intervention. Additionally, subgroup analyses were carried out on thirteen other comparisons that revealed: there is low level evidence that Lower Lingual Arches and lip bumpers maintain space and prevent crowding, that the Schwarz appliance reduces crowding in the lower arch, that coaxial NiTi is better at treating crowding in the lower arch than single stranded NiTi and that self-ligating brackets are over a minute and a half quicker to untie and ligate than conventional brackets. No other statistically significant outcomes were found that were clinically significant, in any of the other comparisons. There were an insufficient number of studies to allow analysis between different age groups. Authors' conclusions: 1) There is currently insufficient evidence to allow analysis and comparisons between different age groups. 2) There are three interventions that are effective at preventing crowding in the early dentition that are the Lower Lingual Arch, lip bumper and Schwarz appliance. There is some evidence to suggest that Coaxial NiTi is better at aligning teeth and reducing crowding than single-stranded NiTi. An additional outcome of clinical interest was that self-ligating brackets are quicker to untie and ligate than conventional brackets, saving clinical time. Further high-quality evidence is needed.
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Jacobsen, Dawn. "Classification of Toolmark Surfaces on Zipper Teeth." Thesis, University of North Texas, 1999. https://digital.library.unt.edu/ark:/67531/metadc2248/.
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This study proposes the classification of the toolmark under the heads of zipper teeth as a subclass characteristic as outlined by the Association of Firearm and Toolmark Examiners (AFTE). Two separate cases in which zipper teeth were found at crime scenes prompted this study. Brass zipper teeth manufactured by YKK were taken from 20 pairs of jeans and studied using a Reichert comparison microscope at 4X power. Photographs were taken and over 750 comparisons made. It was found that the toolmarks on each side on the 20 zippers were unique and independent of all other sides. The observations made in this study indicate that classifying zipper teeth toolmarks as a subclass characteristic is valid.
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Whitenack, Lisa Beth. "The biomechanics and evolution of shark teeth." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002678.
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Becker, Felix [Verfasser], and Oliver [Akademischer Betreuer] Paul. "Miniaturized force/moment transducers for instrumented teeth." Freiburg : Universität, 2020. http://d-nb.info/1211956806/34.
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Matvienko-Sikar, Paula Ann. "Cutting'aesthetic teeth' : Flannery O'Connor's habit of art." reponame:Repositório Institucional da UFSC, 1993. https://repositorio.ufsc.br/xmlui/handle/123456789/157800.
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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e ExpressãoMade available in DSpace on 2016-01-08T18:15:41Z (GMT). No. of bitstreams: 1 95704.pdf: 2354607 bytes, checksum: 34a186b061e876fad881aeb705ee8e84 (MD5) Previous issue date: 1993
Este trabalho foi sugerido pela afirmação de Flannery O'Connor que sua "dedicação estética" nasceu através do contato com Art and Scholasticism de Jacques Maritain. O propósito foi chegar a uma interpretação do sentido da frase. Uma investigação detalhada foi feita do conteúdo de Art and Scholasticism, posteriormente contrastada com os resultados de uma pesquisa feita em seus ensaios e suas cartas, o que revelou numerosos ecos de diversos trechos constando no texto de Maritain. Três pontos principais foram escolhidos como critérios na análise do hábito artístico de O'Connor: 1) a prática de arte implica uma luta; 2) a arte somente pode ser percebida pelos sentidos; e 3) a prática de arte exige do artista a dedicação indivisa à obra nascente. O estudo conclui que, para O'Connor, o brotar da dentição estética, através da leitura de Art and Scholasticism, significou que, ao perceber na análise da natureza da arte algo com que podia concordar, ela reconheceu tanto sua própria capacidade de tornar-se uma artista literária, quanto sua vontade de assumir a tarefa de desenvolver em sua pessoa o hábito de arte.
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Bailey, Lillian Amanda. "The Bolton Analysis revisited." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0005/MQ34333.pdf.
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Tongkoom, Subongkoch. "The prevalence of dental anomalies in the primary dentition of Chinese children." [Hong Kong] : Faculty of Dentistry, the University of Hong Kong, 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19902220.
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Dempsey, Paula Jane. "Genetic and environmental contributions to morphological variation in the human permanent dentition : a study of Australian twins." Title page, contents and abstract only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09phd389.pdf.
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Bibliography: leaves 348-366. Elucidates the nature and extent of genetic and environmental contributions to variation in permanent tooth crown size. Sibling correlations are compared to find evidence of sex-linked genes contributing to crown size. This hypothesis was tested by comparing mean tooth size in female-male opposite-sex twins with same-sex twins, and singletons.
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Wong, Tak-ying Anita, and 黃德瑩. "Oral health status and quality of life of children and adolescents with severe hypodontia." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31954339.
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Young, William G. "Tooth wear /." [St. Lucia, Qld.], 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17715.pdf.
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Sajnani, Anand Kumar. "Impacted canines characteristics, prevalence and implications /." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B44173350.
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Sebbahi, Rajia. "Efficacy of ultrasound imaging to detect periodontal bone defects." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10186.
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Thesis (M.S.)--West Virginia University, 2009.Title from document title page. Document formatted into pages; contains vi, 55 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 42-44).
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Nassar, Diaa Eldin M. "A prototype automatic dental identification system (ADIS)." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=1977.
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Thesis (M.S.)--West Virginia University, 2001.Title from document title page. Document formatted into pages; contains v, 72 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 70-72).
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Wong, Tak-ying Anita. "Oral health status and quality of life of children and adolescents with severe hypodontia." Click to view the E-thesis via HKUTO, 2003. http://sunzi.lib.hku.hk/hkuto/record/B31954339.
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Karkhanis, Shalmira. "Macroscopic and microscopic changes in incinerated deciduous teeth." University of Western Australia. Centre for Forensic Science, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0170.
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The teeth are amongst the most resilient elements of the human skeleton and are thus often utilised in routine forensic investigation involving the identification of unknown remains. The teeth, however, also have other practical forensic applications. Teeth exposed to thermal stress have the potential to not only aid in identification but also in understanding the circumstances surrounding the fire. Previous investigations have drawn conclusions that if a fire flares up suddenly and intensively, the teeth burst and enamel is lost. If the blaze commences gently and burns slowly, then the first observable morphologic change is the colour. The teeth subsequently are difficult to handle, thus changes in teeth can indicate the history of exposure to thermal conditions. Children are twice as likely to become victims of house fire because of an inability to safely evacuate from areas of danger. The literature demonstrates, however, that research on the effects of incineration on teeth is mostly restricted to the permanent teeth. The apparent lack of knowledge on the effects of incineration on deciduous teeth thus necessitates further research in this area. This research project primarily aims at understanding the effect of extreme temperatures on deciduous teeth. It also aims to relate colour changes that occur post heating with fragility to aid in proper handling of samples in a forensic scenario and to determine the possibility of identifying incineration temperature based on tooth condition. The samples analysed composed of 90 deciduous teeth (45 molars and 45 anteriors) extracted as a part of clinical treatment were used for the study. The project involved exposing extracted deciduous teeth to temperatures ranging from 100°C to 1100°C for 30 minutes using a laboratory Gallenkamp oven. Unheated deciduous teeth were used as controls for the project. Post-incineration the teeth were then analysed under a stereomicroscope and SEM for morphological changes. A colorimetric analysis was also undertaken to evaluate the colour changes induced in the primary teeth due to the thermal stress. It was found that it was possible to identify the incineration temperature based on the tooth condition when the colour changes, stereomicroscopic findings and SEM images were utilised collectively. It was also concluded that the thermally induced changes observed in primary teeth occur at lower temperatures in comparison to the permanent teeth. It was also established that post-incineration deciduous teeth are fragile and show a tendency to fragment after minimal exposure to thermal stress as compared to the permanent teeth. Moreover enamel and dentin remained identifiable in primary teeth even after exposure to 1100°C for 30 minutes while cementum lost its structural morphology at 900°C.
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du, Toit Nicole. "Anatomical, pathological and clinical study of donkey teeth." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/4385.
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Eighty normal cheek teeth and 26 normal incisors extracted from 14 donkeys (median age 19 years) at post mortem were anatomically examined including grossly and by computerised axial tomography (CAT) imaging. Decalcified histology was performed on 54 sections from 18 teeth (8 donkeys), undeclacified histology on 16 sections from 7 donkeys and scanning electron microscopy on 10 sections from 10 teeth (3 donkeys). The dental formulae and tooth number was found to be the same as in horses with a higher prevalence (17 %) of canine teeth in female donkeys. A decrease in tooth length, pulp horn length and pulp horn width with age was illustrated, as was an increase in occlusal secondary dentine depth with age, although not all these age changes were statistically significant. Normal histological and ultrastructural features of donkey teeth were identified and found to be similar to equine findings. Enamel was found to be thicker buccally in both maxillary and mandibular cheek teeth. Quantitative measurements of transverse dentine thickness around pulp cavities, dentinal tubule diameters and densities, and enamel prism diameters were made. Left lower incisors (301) were extracted from 7 donkeys and 6 horses for micro-hardness determination of enamel, primary and secondary dentine using a Knoop Hardness indenter. No significant difference between donkey and horse incisor microhardness was demonstrated. Examination of 19 donkey skulls at post mortem examination showed donkeys to have a higher degree of anisognathia (27%) compared to horses (23%). Post mortem dental examination of 349 donkeys (median age 31) demonstrated a high prevalence of dental disease (93%) and in particular cheek teeth diastemata (85%). Furthermore, age was associated with increasing prevalence of dental disease and diastemata. Diastemata were also associated with the presence of other dental disorders and with colic-related death in affected donkeys. Quantitative measurements of 45 diastemata from 16 donkeys showed no difference in the medial and lateral width of diastemata but periodontal pockets were deeper laterally. The definition of valve and open diastemata were confirmed. Pulp exposure, dental caries and periodontal disease were examined in detail (54 skulls) at post mortem. A total of 19 teeth were extracted for further detailed examination as performed in normal anatomy. Clinical dental examinations were performed on 357 donkeys in the U.K. that were selected for age distribution, and the prevalence of dental disease in different age groups was found to increase from 28% in the youngest group (age 0-10 years) to 98% in the oldest group (age > 35 years). An increased prevalence of most dental disorders with age was demonstrated as was an association between dental disease and weight loss, poor body condition score, supplemental feeding and previous episodes of colic. Clinical dental examination of 203 working donkeys in Mexico showed similar types of dental disorders as found in the U.K. study, with dental disease present in 62%, of which 18% required urgent dental treatment. There was a significant association between age groups and dental disease, and age groups and body condition score, but there was no association between dental disease and body condition score. However, body condition score was not associated with supplemental feeding or faecal egg counts either.
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Mallineni, Sreekanth Kumar. "Radiographic localization of supernumerary teeth in the maxilla." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46848940.
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Mashloosh, K. M. "Abrasive wear with particular reference to digger teeth." Thesis, Brunel University, 1987. http://bura.brunel.ac.uk/handle/2438/7883.
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Abrasive wear occurs when a contact associated with stress between a metal surface and a herd particle (frequently of mineral origin) leads to friction between the two. In a very wide range of industrial applications, abrasive wear is the main reason for component and equipment repair or replacement. In most of these applications, especially those of earth moving, construction and mining equipment, digger teeth are used to improve equipment performance. Digger teeth can be produced in different shapes and sizes (mainly by casting) and a wide range of materials are used. This project is concerned with both a field trial of the wear of digger teeth fixed to the front of a bucket used in a gravel pit, and also a laboratory investigation of abrasive wear mechanisms. It was found that the wear of digger teeth increased with increasing working hours, but the wear rate eventually decreased. The dimensions and shape of the front of the tooth changed and gravel removal became more inefficient. Plastic deformation and phase transformation were observed in the worn surfaces of the teeth. In the laboratory study, many parameters were investigated utilising a pin-on disc technique. Wear rate increases linearly with load and decreases with sliding distance. The effect of attack angle on abrasive wear showed that wear volume increases with increasing attack angle up to a certain value (90°) and then decreases. Corrosion increases the initial wear rate, and the amount of material removed in the wet corrosive test was higher than the corresponding dry test. It was difficult to reproduce the same results from the field trial in the laboratory because of the difference in the conditions in the two cases. Optical and scanning electron microscopy were used to study the worn surfaces, abrasive papers and wear debris. Different abrasive wear mechanisms were observed throughout this investigation. A cutting mechanism associated with spiral debris was observed during short pin-on disc tests and with higher attack angles. A ploughing action associated with plate-like debris was observed during longer tests and at lower attack angles. Fragmentation was observed in brittle materials.
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Agber, J. U. "Hybrid stepping motors with multiple-teeth per pole." Thesis, University of Newcastle Upon Tyne, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355834.
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Jowett, Adrian K. "Glycosylation patterns during development of mouse molar teeth." Thesis, University of Manchester, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304035.
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Almaroof, Ahmed Ghazi Subhy. "Polymer composites for restoration of endodontically treated teeth." Thesis, King's College London (University of London), 2017. https://kclpure.kcl.ac.uk/portal/en/theses/polymer-composites-for-restoration-of-endodontically-treated-teeth(e00b96f9-ec1f-4fe1-8807-783f843e4d18).html.
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The failure of endodontically treated teeth (ETT) restored with adhesive post restorations is related to several factors but mainly associated with the mechanical and biological properties of the materials currently available to fabricate post-core systems. This study is based on developing new post materials, using a biomimetic concept to improve the survival rate of severely damaged ETT. Furthermore, the study was hypothesised that the inclusion of a polymerisable antibacterial monomer, eugenyl methacrylate (EgMA), within the resin composite core and adhesive materials would inhibit endodontic biofilm formation and lower the risk of reinfection and secondary caries. Two experimental post materials were fabricated and optimised based on their physical and mechanical properties: (i) polyethylene-hydroxyapatite composite exhibited good aesthetics, limited water sorption and a melting temperature of 135-136 °C that would enable easy retrieval from the root canal in case of a retreatment, but their lower flexural modulus is expected to limit their use as an endodontic post and (ii) Kevlar fibre reinforced semi-IPN matrix composites showed favourable aesthetic, mechanical strength, fatigue resistance, radiopacity and cytocompatibility to function as new fibre reinforced composite post. EgMA monomer was incorporated at 5 and 10 wt.% to formulate dual-cure composite core, and at 20 wt.% to modify two commercial dental adhesives. The antibacterial activity of these formulations was evaluated and the influence of this monomer on curing kinetics, physical and mechanical properties, wettability, bonding ability and cytotoxicity is reported. The monomer endowed the modified adhesives with obvious cavity disinfecting effects before curing and impart an effective bacteriostatic activity against oral bacteria (S. mutans, E. faecalis and P. acnes) commonly associated with endodontic and restorative failures after being cured, without influencing the degree of monomer conversion, bonding ability to root canal dentine and cytocompatibility. The most suited materials developed in this study are feasible as post-core systems for effective treatment of ETT, and thus influence the practice of endodontics.
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Lam, Raymond Hiu-wai. "Artificial teeth : dental biofilm analysis on a chip." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62525.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references.
In this thesis, an "artificial teeth" microfluidic device is developed that provides unprecedented control over the conditions required to simulate the growth of complex dental biofilm. Dental plaque formation is not only a precursor to tooth decay, but also induces more serious systemic health problems such as cardiovascular disease, pre-term labor, and diabetes. Therefore, understanding the conditions promoting colonization and subsequent biofilm development involving complex bacteria coaggregation is particularly important. The requirement of the continuous culture and analysis systems for large quantities of growth media and reagents has pushed the move toward microfluidics - the miniaturization and chip-based control of fluidic operations. Microfluidic oxygenation is necessary to regulate the cellular gas condition of culture medium, especially for mixed population biofilms consisting of both anaerobic and aerobic cell populations. A double-layer gas perfusion network structure fabricated above the cell culture regions is developed for culture oxygenation. Throughout the modeling and analysis of the oxygen transfer in microfluidic oxygenators, design strategies for such devices are proposed for different configurations. Various designs of oxygen-nitrogen mixer networks providing parallel oxygenation with differential or tunable oxygen concentrations are described and verified experimentally to test the corresponding applicability in microbiological culture. The microfluidic "artificial teeth" platform, integrated with the microfluidic oxygenators, functions as an effective and inexpensive analysis tool to dynamically adjust critical growth parameters such as bacteria population, growth medium composition, medium flow rate and dissolved oxygen levels. The first single-chamber "artificial tooth" chip is developed for long-term dental biofilm culture with better medium handling, such as mixing, humidification and automated growth medium replenishment. This device is also compatible with different analysis techniques using optical microscopy in order to determine the biofilm thickness, the ratio between viable and dead cells, and the visualization of spatial distribution of different dental bacteria in the biofilm. Furthermore, the single-chamber design is extended to a device containing up to 128 chambers. This "artificial teeth" chip is developed to achieve high-throughput parallel biofilm culture and analysis with a matrix of different growth conditions that can contribute to the quantitative studies of the physiology of dental biofilms. The artificial teeth device is applied to investigate the response of two key dental bacteria, Streptococci sp. and Fusobacterium nucleatum, in the biofilm under different microenvironments, including their growth under different gas conditions and their adherence properties with different sucrose concentrations. This work demonstrates a successful application of microfluidics to long-term biofilm culture applications.
by Raymond H. W. Lam.
Ph.D.
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Camilleri, Simon. "The genetic aetiology of ectopic maxillary canine teeth." Thesis, King's College London (University of London), 2013. https://kclpure.kcl.ac.uk/portal/en/theses/the-genetic-aetiology-of-ectopic-maxillary-canine-teeth(229e4493-db55-43ce-bf44-7e2aa29cf54b).html.
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Introduction. The ectopic canine (EC) is a common clinical complication of dental development appearing in 1-2% of the Western population The aetiology is controversial with opinion divided as to a genetic or environmental mechanism. This study addresses the hypothesis that genetic factors play an important role in the aetiology of ectopic maxillary canines. Elucidation of the extent of genetic factors will determine the feasibility of further molecular studies to identify putative genes responsible for ectopic eruption and aid in their identification. Molecular control of tooth eruption would reduce or eliminate the need for surgical procedures associated with buried and impacted teeth and facilitate treatment of those dentofacial anomalies where failure of tooth eruption is a feature. Methods. The study is divided into five parts: 1. A segregation analysis was carried out on 63 pedigrees where a proband was identified as affected with EC, in order to determine whether a genetic component does exist and to provide parameters for further investigation by linkage analysis. 2. Following a positive result from the segregation analysis, linkage analysis was carried out on DNA obtained from an informative, three generation family with seven affected members. 3. Whole exome sequencing was carried out on two distantly related affected members of this family, common, novel and rare variants being identified. 4. The exons and intron-exon junctions of the candidate genes were sequenced using Sanger sequencing in the family and in 18 unrelated cases of EC. 5. In situ hybridisation was carried out using the genes ANO5 and PPP1R14C. Results. Results. The segregation analysis identified a major genetic component with autosomal dominant transmission and the likelihood of a single major locus being involved. The linkage analysis identified several regions of interest and this data was used to filter the results of the exome sequencing. The presence of variations in both PPP1R14C and ANO5 were necessary to precipitate the phenotype. Sanger sequencing of unaffected family members and of unrelated cases showed no similar variants. In situ hybridisation showed both PPP1R14C and ANO5 to be expressed in tooth and supporting tissues, leading to a supposition of digenic inheritance. Conclusion. The genes PPP1R14C and ANO5 are implicated in the aetiology of EC in a digenic inheritance pattern in this family. Further sequencing of affected families and functional studies are required as well as investigation of the methylation status of discordant monozygotic twins.
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Al-Hotheiry, Mehdi, and David Sun. "Assessment of the gingival biotype at natural teeth." Thesis, Malmö universitet, Odontologiska fakulteten (OD), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-19973.
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BakgrundDen gingivala biotypen utvärderas regelbundet kring egna tänder före och efter kirurgiska ingrepp (t.ex för behandlingsplanering och riskbedömning). Nyligen presenterade Colorvue® biotypprobe (CBP) en ny metod för bedömning av gingivala biotyper i syfte av att möjliggöra en mer detaljerad klassificering av gingivan. Studien syftade till att bedöma det nya sonderingsystemets reproducerbarhet, repeterbarhet och riktighet vid naturliga tänder.MetoderDenna tvärsnittsstudie omfattade 50 deltagare (3 tänder/deltagare) och gingival biotyp bedömdes med 3 metoder vid en centralincisiv, lateralincisiv och hörntand med: 1) med en standard periodontal sond (SPP), 2) med CBP-proberna (CBP1/2/3), och 3) genom visuell bedömning (VA). Den faktiska tjockleken bedömdes genom transgingival sondering med en endodontisk fil. Utvärderingen gjordes av 8 granskare och reproducerbarhet mellan granskare och repeterbarhet inom granskaren utvärderades.ResultatFördelningen av gingivala tjockleken i studiepopulationen är uppdelad i tunn (18%), mellan (29%), tjock (29%) och mycket tjock (24%). Fördelningen av de fyra CBP-kategorierna är tunn (10%), medium (87%), tjock (2%) och mycket tjock (1%). Intervallet av gingivala biotypen bland de 8 granskarna enligt CBP: tunn (1% till 34%), medium (65% till 86%), tjock (0% till 4%) och mycket tjock (0% till 3%). Statistiskt signifikant skillnad i tjocklek av gingivan hittades i elva av fyrtio utvärderingar bland alla examinator och för alla metoder (VA, CBP och SPP). Fem av de signifikanta skillnaderna hittades bland CBP-sonderna, fyra för SPP och två för VA. Varken SPP eller CBP visade en tydlig tillförlitlighet i bedömning av gingivala tjockleken. SPP visade bäst resultat i både reproducerbarhet och repeterbarhet. Överensstämmelsen mellan granskarna med avseende på CBP varierade från måttlig till stor överensstämmelse. Reproducerbarhet bland granskaren varierade från dålig till nästan perfekt överenskommelse.SlutsatserBaserat på reproducerbarhet, repeterbarhet och exakthet, är SPP-sondernas förmåga att klassificera gingival biotyp i 4 kategorier av distinkt tjocklek bättre än CBP och VA.BackgroundThe gingival biotype is regularly assessed around natural teeth before and after surgical procedures (e.g. for treatment planning and risk assessment). Recently, a new set of probes Colorvue® biotype probe (CBP) for gingival biotype assessment has been introduced, with the intention to facilitate a more detailed classification (i.e., 4 categories in total). The study aimed to evaluate the feasibility and reproducibility of this new probe system at natural teeth.MethodsThis cross-sectional study included 50 participants (3 teeth/participant), and gingival biotype was assessed by 3 methods at one maxillary central incisor, lateral incisor and canine with 1) with a standard periodontal probe, 2) with the CBP probes, and 3) by visual judgement. The actual thickness was assessed by transgingival sounding with an endodontic file. The judgements were done by 8 examiners, and inter-examiner reproducibility and intra-examiner repeatability were assessed.ResultsThe distribution of the gingival thickness in the present study population is divided into thin (18%), medium (29%), thick (29%) and very thick (24%). The distribution of the 4 CBP categories are thin (10%), medium (87%), thick (2%) and very thick (1%). The range of gingival biotype among the 8 examinators: thin (1% to 34%), medium (65% to 86%), thick (0% to 4%) and very thick (0% to 3%). A statistically significant difference in gingival thickness was found in eleven out of forty evaluations among all evaluators and for all methods (VA, CBP, and SPP). Five of the significant differences were found among the CBP probes, four for the SPP, and two for the VA. When compared, neither the SPP nor the CBP was clearly more reliability than the other. SPP showed the best results in both inter-examiner reproducibility and intra-examiner repeatability. Inter-examiner reproducibility for the CBP ranged from moderate to substantial agreement. Intra-examiner repeatability varied from poor to almost perfect agreement.ConclusionsBased on the reproducibility, repeatability and accuracy, the SPP method to classify the gingival biotype accurately into 4 categories of distinct thickness performed better than CBP and VA.
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Steiner, Alexis K. "3D Digitization and Wear Analysis of Sauropod Teeth." Bowling Green State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1525990888624381.
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George, Christian Owens. "Quantification of wear in Equus teeth from Florida." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1001146.
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