A novel fabrication process is presented which allows for three-dimensionally independent features to be etched in silicon using SF6 gas in a deep reactive ion etcher (DRIE) after a single etch step. The mechanism allowing for different feature depths and widths to be produced over a wafer is reactive ion etch lag, where etch rate scales with the exposed feature size in the mask. A modified Langmuir model has been developed relating the geometry of the exposed areas in a specific mask pattern as well as the etch duration to the final depth and width of a channel that is produced after isotropic silicon etching. This fabrication process is tailored for microfluidic network design, but the capabilities of the process can be applied elsewhere. A characterization of an Alcatel DRIE tool is also presented in order to enhance RIE lag by varying etch process parameters, increasing the variety of channel sizes that can be fabricated. High values of flow rate, coil power, and pressure were found to produce this effect. The capability of the modeled process for creating a microchip cooling device for high-heat flux applications was also investigated. Using meander channels, heat flux in excess of 100W/cm2 were cooled using 750µL/s flow rate of water through the chip. This single-mask process reduces risk of damage to the chip and provides the capability to cool high-heat-flux microprocessors for the next 10 years, and for an even longer time once the geometry of the channels is optimized. / Master of Science

Herstellung anwendungsbezogener SiO2- Grabenstrukturen im sub-μm-Bereich durch RIE und ICP-Prozesse.

L'utilisation de la microscopie de champ proche optique SNOM reste très limitée dû aux difficultés de mise en œuvre instrumentale. La sonde de champ proche est le cœur du microscope et la maîtrise de son utilisation (suppression d'un certain nombre de réglages optiques) constitue la clé technique de l'accès de cette méthode à un plus grand nombre d'utilisateurs. Ces travaux de thèse s'effectuent dans le contexte d'un projet qui consiste à réaliser la preuve de concept d'une sonde novatrice en matériau hybride organique/minéral, de type levier, intégrant une fonction optique. Dans la première partie, une étude bibliographique retrace l'historique des microscopies et donne le principe du champ proche optique. Ensuite, les différentes sondes commerciales de type fibre optique ou cantilever, à ouverture ou sans ouverture, ou autre, leurs avantages et inconvénients, leurs techniques de fabrication et les principaux matériaux utilisés sont présentés. En se basant sur cette étude bibliographique, on propose une nouvelle sonde à pointe pleine en matériau hybride qui associe les avantages de chaque type de sonde. Les raisons du choix du matériau hybride comme matériau de base de la sonde et ses caractéristiques sont aussi présentées dans cette partie. Dans une deuxième partie on détaille le procédé de fabrication du matériau (synthèse) ainsi que le rôle des différentes étapes dans ce procédé et les changements réalisées suite à des modifications des paramètres de la synthèse. Une caractérisation de ce matériau est aussi réalisée dans cette partie en mesurant son indice de réfraction et son module d'Young. La troisième partie est consacrée à la détermination des dimensions de la sonde qui permettent de maximiser le transfert de puissance optique en émission et réception. Ceci est fait en se basant sur une étude plus théorique au travers de simulations. L'effet de plusieurs paramètres sur la propagation de la lumière dans la sonde est étudié (longueur, largeur, épaisseur et raideur du levier ainsi qu'ouverture à l'extrémité de la pointe). La quatrième partie est dédié à la réalisation des sondes "micropoutres sol-gel" et aux caractérisations mécaniques et optiques associées. Elle présente le procédé de fabrication optimisé de sondes optiques couplant la définition des sondes par méthode de masquage et leur libération par gravure réactive ionique et gravure au fluorure de xénon "DRIE + XeF2". A partir de ce procédé, des guides d'ondes optiques ont été réalisés et caractérisés permettant la détermination des pertes optiques et donc du coefficient d'absorption du matériau hybride développé. La conclusion présente les perspectives ouvertes et en cours de ce travail dans le cadre d'un projet plus global. . / .The use of near-field optical microscopy SNOM is still very limited due to difficulties in instrumental work. The probe is the heart of the microscope and control its use (removal of optical settings number) is the technique key to access this method to a larger number of users. This thesis work is realized in the context of a project to achieve a concept proof for an innovative probe organic / inorganic hybrid material, lever type, incorporating an optical function. In the first part, the history of microscopy and the principle of the optical near field are described in a literature study. Then, the various commercial probes of optical fiber or cantilever type, with aperture or apertureless, or otherwise, their advantages and disadvantages, their manufacturing techniques and the main materials used are presented. Based on this literature study, we propose a new probe full tip hybrid material that combines the advantages of each type of probe. The choice reasons of the hybrid material as base material of the probe and its characteristics are also presented in this part. In the second part we detail the manufacturing process of the material (synthesis) as well as each step role in this process and changes made in response to changes in the synthesis parameters. Characterization of this material is also carried out in this part by measuring its refractive index and its Young's modulus. The third part is devoted to the determination of the probe dimensions to maximize the optical transmission and collection power based on a theoretical study through simulations. Several parameters effect on the light propagation in the probe is also studied (length, width, thickness and stiffness of the lever and aperture towards the end of the tip). The fourth part is dedicated to the probe achievement in hybrid material and associated mechanical and optical characterizations. It presents the manufacturing optimized process of optical probes coupling masking defining method probes and releasing method by reactive ion etching and etching xenon fluoride "DRIE + XeF2". Using this process, optical waveguides were realized and characterized for the determination of optical losses and therefore the absorption coefficient of the developed hybrid material. The conclusion presents open perspectives as part of a larger project.

Herstellung anwendungsbezogener SiO2- Grabenstrukturen im sub-μm-Bereich durch RIE und ICP-Prozesse.

La mission Darwin, un projet d'interférométrie spatiale initié par l'ESA, nécessite l'utilisation de filtres modaux fonctionnant dans la gamme spectrale [6-20 µm]. Dans le cadre de ce travail, nous proposons la réalisation de filtres modaux basés sur des guides d'onde « tout tellurures » obtenus par la méthode d'empilement et de gravure. L'originalité de ce travail réside dans le fait que les guides réalisés sont de grandes dimensions (couches épaisses et profondeurs de gravure importantes), pour satisfaire aux exigences du projet. La première étape a donc consisté à choisir une méthode de dépôt qui permette d'obtenir des couches épaisses. La co-évaporation thermique a ainsi été mise en place et les paramètres de dépôt optimisés. Des couches d'épaisseur pouvant atteindre 17 µm, de bonne qualité (adhérentes, amorphes, denses et homogènes), transparentes de 6 à 20 µm et d'indice de réfraction contrôlé ont pu être obtenues. La gravure physique réactive (RIE) de ces couches, en utilisant un mélange gazeux CHF3/O2/Ar, a constitué la deuxième partie de ce travail. L'obtention de marches de profondeur pouvant dépasser 10 µm, présentant des profils de gravure de qualité, a été démontrée. Les différents guides d'onde IR réalisés ont été caractérisés optiquement après préparation de leurs faces d'entrée et de sortie. L'observation d'un bon confinement de la lumière sur un banc de guidage à λ = 10,6 µm et l'obtention d'un taux de réjection de 10-3 sur un banc d'interférométrie annulante nous ont permis de confirmer que les guides d'onde à base de couches tellurures et réalisés par la méthode d'empilement et de gravure constituaient une solution de choix en tant que filtres modaux pour l'interférométrie spatiale. / The Darwin mission, an interferometric spatial project initiated by ESA, requires modal filters being able to work in the whole spectral range [6-20 µm]. In the framework of this work, we propose the realization of modal filters based on waveguides obtained by stacking and etching chalcogenide films. The originality of this work lies in the fact that the realized waveguides have large dimensions (thick films and deep etching), to satisfy the project requirements. The first step consisted in choosing the deposition method which allows obtaining thick films. The thermal co-evaporation was setting up and the deposition parameters were optimized. Films with thickness which can reach 17 µm, of good quality (adhesive, amorphous, dense and homogeneous), transparent from 6 to 20 µm and with controlled refractive index were obtained. The physical reactive etching of these films, by using a gas mixture CHF3/O2/Ar, constituted the second part of this work. The obtaining of deep rib which can exceed 10 µm, presenting etching profiles of good quality was demonstrated. The elaborated IR waveguides were optically characterized after preparation of their entrance and exit faces. The observation of light confinement on a guiding bench at λ = 10.6 µm and the obtaining of a rejection rate of 10-3 on a nulling interferometry bench allowed confirming that the waveguides based on the stacking and etching of telluride films was a choice solution as modal filters for the spatial interferometry.

Submitted by PPG Letras (letraspg@pucrs.br) on 2018-05-07T12:21:06Z No. of bitstreams: 1 Disserta??o_Beatrice Vieira dos Santos Witt.pdf: 893638 bytes, checksum: fd539c8bb1fb964ccd6c941054a435fc (MD5) / Approved for entry into archive by Caroline Xavier (caroline.xavier@pucrs.br) on 2018-05-15T14:32:27Z (GMT) No. of bitstreams: 1 Disserta??o_Beatrice Vieira dos Santos Witt.pdf: 893638 bytes, checksum: fd539c8bb1fb964ccd6c941054a435fc (MD5) / Made available in DSpace on 2018-05-15T14:36:47Z (GMT). No. of bitstreams: 1 Disserta??o_Beatrice Vieira dos Santos Witt.pdf: 893638 bytes, checksum: fd539c8bb1fb964ccd6c941054a435fc (MD5) Previous issue date: 2018-02-28 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / This dissertation aims to study the translation and adaptation of jokes, puns and wordplays from American English to Brazilian Portuguese and analyze them based on Relevance Theory. This theory is about the cognitive aspect of interpretation and understanding of propositions from a sender by a receiver, through pragmatic and semantic processes. It was proposed for the first time by Sperber and Wilson in 1986 and it is based on the pragmatic theories developed by Grice (1989), which states that most human communication is the expression and the recognition of the intentions. Also, in addition to the Relevance Theory, other theories were also considered about humor, what expectation it creates in the listener, and theories about how the translator can reach this expectation in the process of translating into another language and adapting to another culture ? to the point of generating a similar effect on the receiver. The objects of this study were selected from humorous animated and live-action series and its translated and adapted versions. Examples of successful jokes, puns and humorous speech were selected as well as unsuccessful one (they fulfilled or not the expectation of reaching the desired meaning when they were translated and adapted to expressions or equivalent jokes in the target language). The ones which were considered as not successful lost the funniness or made no sense in Portuguese because of the lack of knowledge about the culture or the English language aspects by the target-language audience. The first step of this analysis was to compare the orally spoken text by the characters of four American series, two animated and two with actors, in the original English version in its version dubbed into Brazilian Portuguese. After that, the texts were analyzed and transcribed under the principles of Relevance Theory. The results of the analysis indicate that there are several possibilities for translation when the point is to try to maintain the mood of the dialogue, not forgetting that the translated text, to be dubbed, needs to fit the character's speaking time so that his voice does not become desynchronized. Considering these aspects, we could conclude that each case requires a calculation between cost and benefit and that it is not possible to generalize that the adaptive translation is always the most effective when translating a text with the purpose of using it in dubbing, but the adaptive translation is the one that has the most chances to fulfill the objective. Some of the analyzed examples have retained their same potential humor in both original and in translated versions, because they have been adapted not only to equivalent words and expressions in the target language, but also to drastic changes from a US reference to a Brazilian one. Other ones lost their humor and reference when they were translated, since in Brazilian Portuguese it was not possible to make the inference that the original text invites to do. Finally, one of the examples showed that a literal translation can also maintain the humor if it is not tied to something particularly cultural of the United States or to some peculiarity of the English language. / Esta disserta??o visa estudar a tradu??o e adapta??o de piadas, trocadilhos e jogos de palavras do ingl?s para o portugu?s brasileiro, e analis?-las com embasamento na Teoria da Relev?ncia. Essa Teoria trata do aspecto cognitivo de interpreta??o e entendimento de enunciados propostos por um emissor por parte de um receptor, atrav?s de processos pragm?ticos e sem?nticos. Ela foi proposta, pela primeira vez, por Sperber e Wilson em 1986 e se baseia nas teorias pragm?ticas desenvolvidas por Grice (1989), que afirma que a maior parte da comunica??o humana ? a express?o e o reconhecimento das inten??es. Al?m da Teoria da Relev?ncia, tamb?m foram consideradas teorias a respeito do humor, qual a expectativa que ele cria no ouvinte, e teorias a respeito de como o tradutor pode efetivar essa expectativa no processo de tradu??o para outra l?ngua e adapta??o para outra cultura ? a ponto de gerar um efeito semelhante no receptor. Os objetos deste estudo foram selecionados a partir de seriados, animados ou com atores reais, de cunho humor?stico traduzidos e adaptados. Foram selecionados exemplos em que as piadas, trocadilhos e/ou jogos de palavras foram bemsucedidos (cumpriram a expectativa de atingir o sentido desejado ao terem sido adaptadas para express?es ou piadas equivalentes na l?ngua-alvo) e outros que n?o foram bem-sucedidos (foram traduzidas sem adapta??o a ponto de n?o fazer sentido para um nativo de l?ngua portuguesa sem conhecimento da l?ngua do texto em quest?o ou de algum aspecto cultural necess?rio para compreens?o). O primeiro passo dessa an?lise foi comparar o texto dito oralmente pelos personagens de quatro s?ries americanas, sendo duas animadas e duas com atores, na vers?o original em ingl?s na sua vers?o dublada para o portugu?s brasileiro. Depois disso, analisamos os textos transcritos sob os princ?pios da Teoria da Relev?ncia. Os resultados da an?lise indicam que existem v?rias possibilidades de tradu??o quando a quest?o ? tentar manter o humor do di?logo, sem esquecer que o texto traduzido, para ser dublado, precisa se adequar ao tempo de fala do personagem para que sua voz n?o fique dessincronizada. Considerando esses aspectos, pudemos concluir que cada caso exige um c?lculo entre custo e benef?cio e que n?o ? poss?vel generalizar que a tradu??o adaptativa ? sempre a mais eficaz na hora de traduzir um texto com o objetivo de us?-lo em dublagem, mas a tradu??o adaptativa ? a que possui mais chances de cumprir o objetivo. Dentre os exemplos analisados, alguns mantiveram seu potencial de humor tanto na vers?o original quanto na tradu??o, porque foram devidamente adaptados, n?o somente para palavras e express?es equivalentes na l?ngua-alvo, mas com mudan?as dr?sticas de uma refer?ncia americana para uma brasileira. Outros textos perderam o humor e a refer?ncia quando foram traduzidos, uma vez que no portugu?s brasileiro n?o foi poss?vel fazer a infer?ncia que o texto original convida a fazer. Por fim, um dos exemplos mostrou que uma tradu??o literal tamb?m pode manter o humor se ele n?o est? atrelado a algo cultural particular dos Estados Unidos ou a alguma peculiaridade da l?ngua inglesa.

Made available in DSpace on 2015-07-15T13:31:39Z (GMT). No. of bitstreams: 1 Rejane Oliveira.pdf: 1599274 bytes, checksum: c629b135eccc51045fc99dc864689219 (MD5) Previous issue date: 2007-12-18 / The Atraumatic Restorative Treatment (ART) is a treatment alternative for the caries disease, which remains with high prevalence, and constitutes a serious public health problem. The ART consists in the removal of the carious tissue with manual instruments and later closing of its cavities with glass-ionomer cement (GIC). It is important to develop a health promotion program associated with the clinical procedure. The World Health Organization (WHO) recommends the utilization of such technique for several groups, including pregnant women. The aim of this clinical essay was to check the use of the Atraumatic Restorative Treatment in pregnant women of the public system in Feira de Santana Bahia. The sample consisted of 35 pregnant women who underwent 84 class-I restorations and 71 dental sealants with GIC Ketac Molar EasyMix. After anamnesis and clinical examinations, a semi-structured form was filled out on oral hygiene and dietary practices, and on the extent of the technical acceptance. This group was inserted into a health promotion program with speeches, supervised brushings and plaque rate collection. An examiner carried out clinical evaluation of the restorations and of the sealants after a six-month period, through standard scores (0-9) which were later turned into success (0, 1 and 7) and unsuccess (2, 3, 4, 5, 6 and 8). It has been used the successful criterion for the sealants (present or partial loss) and the unsuccessful one (total loss). After the systematization of the collected data, it was observed success in 90,5% for ART and 85,9% for sealants. With regard to the program, 71,4% pregnant women reported changes in oral hygiene and 54,3% in dietary habits. A significant difference occurred between the initial and final averages of the plaque rates, being such reduction, on average, 17,71%. The extent of technical acceptance was 100%. It has been concluded that ART is feasible as a tooth decay treatment alternative in pregnant women inserted in a preventive educational program. It has been inferred that more researches have to be carried out, promoting the development of public policies which increase the use of ART in pregnant women. / A c?rie dent?ria constitui-se em um grave problema de sa?de p?blica, com alta preval?ncia em diversas popula??es. O Tratamento Restaurador Atraum?tico (ART) ? uma alternativa de interven??o para esta patologia, consiste na remo??o do tecido cariado com instrumentos manuais e posterior fechamento das cavidades com cimento de ion?mero de vidro (CIV). Aliado ao procedimento cl?nico, ? importante se desenvolver um programa de promo??o de sa?de. A Organiza??o Mundial de Sa?de (OMS) recomenda a utiliza??o do ART para diversos grupos, entre eles, as gestantes. Este ensaio cl?nico teve como objetivo avaliar um protocolo de Tratamento Restaurador Atraum?tico em gestantes da rede p?blica de Feira de Santana - BA. A amostra consistiu de 35 gestantes, nas quais foram realizados 84 restaura??es e 71 selantes com CIV Ketac Molar Easymix. Ap?s anamnese e exame cl?nico, foi aplicado um formul?rio semi-estruturado sobre as pr?ticas de higiene bucal e dieta, e sobre o grau de aceita??o da t?cnica. Esse grupo foi inserido em um programa educativo-preventivo de sa?de, com palestras, escova??o supervisionada e coleta de ?ndice de placa. Ap?s seis meses, a avalia??o cl?nica das restaura??es e dos selantes foi realizada por um examinador. As restaura??es foram analisadas pelos escores padronizados (0-9) que posteriormente foram transformados em sucesso (0, 1 e 7) e insucesso (2, 3, 4, 5, 6 e 8). Para os selantes utilizou-se o crit?rio sucesso (presente ou perda parcial) e insucesso (perda total). Ap?s a sistematiza??o dos dados coletados observou-se sucesso de 90,5% para ART e 85,9% para selantes. Em rela??o ao programa, 71,4% das gestantes referiu mudan?as de h?bitos na higiene bucal e 54,3% mudaram h?bitos na dieta. Ocorreu uma diferen?a significativa entre as m?dias dos ?ndices de placa inicial e final, sendo essa redu??o em m?dia de 17,71%. O grau de aceita??o da t?cnica foi de 100%. Concluiu-se que o ART ? uma alternativa de tratamento vi?vel para c?rie em gestantes, inseridas em um programa educativo preventivo. Este estudo aponta para a necessidade de mais pesquisas que fomentem o desenvolvimento de pol?ticas p?blicas e ampliem a utiliza??o do ART em gestantes.

Made available in DSpace on 2015-04-14T13:29:13Z (GMT). No. of bitstreams: 1 384677.pdf: 3951111 bytes, checksum: 684b9b53ca958aa688d3b2186dfb12ca (MD5) Previous issue date: 2006-10-06 / O objetivo do presente estudo foi comparar as imagens digitais com a radiografia convencional no diagn?stico de c?ries proximais. A amostra foi composta por 51 molares e 24 pr?-molares, distribu?dos em grupos de tr?s dentes, montados em blocos de silicone, e radiografados pela t?cnica interproximal, empregando-se o filme InSight (Kodak) e os sistemas digitais Digora? (Soredex), DenOptix (Gendex) e CygnusRay MPS (Progeny). Foram obtidas 25 radiografias em cada m?todo radiogr?fico e analisadas quatro faces proximais em cada radiografia, totalizando 400 faces. As radiografias foram examinadas individualmente, por um observador, em tr?s diferentes momentos para cada m?todo. As les?es de c?rie foram classificadas de acordo com sua profundidade em: (0), ausente; (1), restrita ao esmalte; (2), atingindo a jun??o amelodentin?ria e (3), estendendo-se para a dentina. Para a obten??o do padr?o-ouro, os dentes foram seccionados e desgastados, sendo examinados histologicamente por estereomicroscopia. Para an?lise da concord?ncia intra-observador utilizou-se o teste de Kendall, com o qual constatou-se uma boa concord?ncia (0,831) entre as tr?s avalia??es realizadas. Foram calculados a acur?cia, a sensibilidade, a especificidade, o valor preditivo positivo (VPP), o valor preditivo negativo (VPN) e o ?ndice Kappa, n?o se observando diferen?as estat?sticas significativas entre os valores para os quatro m?todos estudados (ANOVA, p≥0,05). Os m?todos radiogr?ficos tamb?m foram comparados utilizando-se o teste n?o-param?trico de Friedman, complementado pelo seu teste de compara??es m?ltiplas, e igualmente, n?o se observaram diferen?as estat?sticas significativas entre os quatro m?todos. Ainda, para cada m?todo radiogr?fico calculou-se a curva ROC e, na compara??o entre as ?reas sob estas curvas, n?o se verificaram diferen?as estat?sticas ao n?vel de signific?ncia de 5%. Concluiu-se que a acur?cia diagn?stica das imagens digitais na detec??o de c?ries proximais ? similar ?quela das radiografias convencionais.

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Linha de pesquisa: Epidemiologia e controle das doen?as bucais. / Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2018-03-13T17:59:18Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) izabella_barbosa_fernandes.pdf: 1966332 bytes, checksum: 66932f9b7cbb62d762a7b8e0b68dd7a1 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2018-03-21T19:35:24Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) izabella_barbosa_fernandes.pdf: 1966332 bytes, checksum: 66932f9b7cbb62d762a7b8e0b68dd7a1 (MD5) / Made available in DSpace on 2018-03-21T19:35:24Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) izabella_barbosa_fernandes.pdf: 1966332 bytes, checksum: 66932f9b7cbb62d762a7b8e0b68dd7a1 (MD5) Previous issue date: 2017 / O objetivo desse estudo de coorte foi avaliar o risco de fatores cl?nicos e socioambientais dos primeiros anos de vida da crian?a sobre: (1) a progress?o da c?rie dent?ria; (2) a presen?a de dor de dente; (3) a ocorr?ncia de m? oclus?o; (4) o impacto na qualidade de vida relacionada ? sa?de bucal de crian?as pr?-escolares e suas fam?lias. Este estudo foi realizado com 151 pares de m?es e crian?as que participaram de um estudo transversal realizado no ano de 2014 na cidade de Diamantina, Minas Gerais. Durante o baseline (2014) essas crian?as apresentavam de 1 a 3 anos de idade e foram avaliadas clinicamente para verificar a presen?a de c?rie dent?ria por meio dos crit?rios do Sistema Internacional de Avalia??o e Detec??o de C?rie Dent?ria (ICDAS) de placa dent?ria vis?vel, de m? oclus?o e de traumatismos dent?rios. As m?es tamb?m foram avaliadas clinicamente para verificar a presen?a de c?rie dent?ria por meio dos crit?rios da Organiza??o Mundial de Sa?de. Foram aplicados tr?s question?rios ?s m?es sob a forma de entrevista: um question?rio para avalia??o da qualidade de vida relacionada ? sa?de bucal, a vers?o brasileira do Early Childhood Oral Health Impact Scale (B-ECOHIS), o Dental Anxiety Scale (DAS) e um question?rio que abordava aspectos socioambientais da fam?lia al?m de informa??es relativas ?s crian?as e seus h?bitos. Todas as m?es foram orientadas acerca das condi??es bucais de seus filhos e as crian?as foram encaminhadas para atendimento odontol?gico. Ap?s tr?s anos (T1) as crian?as foram reavaliadas clinicamente e as m?es responderam novamente ao B-ECOHIS, ao DAS, al?m de responderem a um question?rio para avalia??o de dor de dente, a vers?o brasileira do Dental Discomfort Questionnaire (DDQ-B). A an?lise de dados foi realizada atrav?s do Statistical Package for the Social Sciences (SPSS) vers?o 22.0, e incluiu a descri??o de frequ?ncia das vari?veis, teste qui-quadrado, teste Wilcoxon e regress?o hier?rquica de Poisson. Crian?as que possu?am pelo menos um dente com c?rie cavitada no baseline, apresentaram maior risco de progress?o de outras les?es cariosas. Foram fatores de risco para a ocorr?ncia de dor de dente em T1, a presen?a de c?rie dent?ria cavitada e a maior aglomera??o familiar no baseline. A presen?a, no baseline, de c?rie dent?ria cavitada e do h?bito de suc??o de dedo foram fatores determinantes da presen?a de m? oclus?o em T1. Incremento de c?rie severa, tratamento odontol?gico e escore do B-ECOHIS no baseline foram associados ? piora na qualidade de vida. Conclui-se que c?rie dent?ria, suc??o de dedo e maior aglomera??o familiar s?o fatores de risco para piores resultados em sa?de bucal na idade pr?-escolar. Incremento de c?rie severa, aus?ncia de tratamento dent?rio e menor escore do B-ECOHIS no baseline foram fatores de risco para a piora na qualidade de vida. / Tese (Doutorado) ? Programa de P?s-Gradua??o em Odontologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2017. / The aim of this cohort study was to evaluate the risk of clinical and socioenvironmental variables in the first years of the child's life: (1) in the progression of dental caries; (2) in the presence of toothache; (3) in the occurrence of malocclusion; (4) in the impact on quality of life related to oral health of preschool children and their families. This study was conducted with 151 pairs of mothers and children who participated in a cross-sectional study conducted in the city of Diamantina, Minas Gerais, in 2014. During the baseline (2014), these children presented 1 to 3-years-old and were clinically evaluated to verify the presence of dental caries using the International Dental Caries Assessment and Detection System (ICDAS) for dental plaque, malocclusion and dental trauma. Mothers were also evaluated clinically to verify the presence of dental caries using World Health Organization criteria. Three questionnaires were applied to the mothers in the form of interviews: a questionnaire to assess the quality of life related to oral health, the Brazilian version of the Early Childhood Oral Health Impact Scale (B-ECOHIS), the Dental Anxiety Scale (DAS) and a questionnaire that addressed socioenvironmental and demographic aspects of the family, as well as information about the children and their habits. All mothers were instructed about the oral conditions of their children and the children were referred to dental care. After three years (T1), the children were clinically re-evaluated and the mothers responded again to the B-ECOHIS, the DAS, and answered a questionnaire for assessing tooth pain, the Brazilian version of the Dental Discomfort Questionnaire (DDQ-B). Data analysis was performed using the Statistical Package for Social Sciences (SPSS) version 22.0, and included the frequency description of the variables, chi-square test, and Poisson hierarchical regression. Children who had at least one tooth with caries cavity in the baseline presented a higher risk of progression of other carious lesions. The presence of cavitary tooth decay and the greater familial agglomeration in the baseline were risk factors for the occurrence of tooth pain in T1. The presence, in the baseline, of cavitary tooth decay and finger suction habit were factors determining the presence of malocclusion in T1.The incidence of severe caries, absence of dental treatment and higher score of B-ECOHIS at the baseline were associated with worsening quality of life. In conclusion, tooth decay, finger suction, greater family agglomeration and the impact on the quality of life in the first years of the child's life, are risk factors for worse oral health outcomes at preschool age. The incidence of severe caries, the absence of dental treatment, and a lower score on B-ECOHIS were risk factors to worsen the quality of life.