Made available in DSpace on 2015-04-14T13:32:46Z (GMT). No. of bitstreams: 1 425500.pdf: 2144685 bytes, checksum: 6bbb3c716f2cfac736793bdebd22430f (MD5) Previous issue date: 2010-03-30 / Objetivo: Avaliar a associa??o entre prematuridade e c?rie dent?ria, defeitos de esmalte, atrasos na matura??o de dentes permanentes e altera??es da mineraliza??o do osso mandibular. M?todo: Foram realizados exame cl?nico odontol?gico e radiografia panor?mica em crian?as com idade entre 7 e 10 anos, nascidos com idade gestacional <37 semanas e peso &#8804; 1750g e comparados com um grupo de nascidos a termo com a mesma idade. Foi avaliado o n?mero de dentes cariados, perdidos e obturados (CPOD), o ?ndice de desenvolvimento de defeitos do esmalte (?ndice DDE), a matura??o dent?ria pelo m?todo Nolla e a mineraliza??o do osso mandibular pelos ?ndices radiomorfom?tricos. Resultados: Foram examinadas 31 crian?as prematuras e 35 controles. O CPOD do grupo de pr?-termos foi de 0,6?0,9 e o do grupo controle de 0,5?0,9 (p=0,59). O ?ndice DDE de cada grupo foi, respectivamente, 5,2?3,3 e 3,9?3,2 (p=0,93). O Escore de Nolla do grupo de prematuros foi 57,2?3,2 e dos controles, 57,9?3,3 (p= 0,38). Os ?ndices radiomorfom?tricos foram semelhantes em ambos os grupos. Conclus?o: N?o foi evidenciada associa??o entre prematuridade e c?rie, defeitos de esmalte, atrasos na matura??o nos dentes permanentes e na mineraliza??o do osso mandibular.

Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2016-06-30T17:23:31Z No. of bitstreams: 1 TES_PAULO_ROBERTO_CASTRO_MATTIA_PARCIAL.pdf: 360391 bytes, checksum: 09001741931b57c50fd6b7240b6295d7 (MD5) / Made available in DSpace on 2016-06-30T17:23:31Z (GMT). No. of bitstreams: 1 TES_PAULO_ROBERTO_CASTRO_MATTIA_PARCIAL.pdf: 360391 bytes, checksum: 09001741931b57c50fd6b7240b6295d7 (MD5) Previous issue date: 2016-03-30 / The use of complete dentures during sleep is still under debate. The use is indicated or not quite empirically, based only on controlling stomatitis caused by fungal infections. The objective was to evaluate the impact of maxillary edentulism and consequent use of complete dentures during sleep in the quality of life, sleep quality, sleep bruxism, temporomandibular dysfunction, level of sleepiness and apnea index in patients. For this, 20 patients from the researcher?s private practice were selected, 90% women and 10% men, average age of 61 years. The subjects must have complete upper dentures and fixed lower implant-supported dentures made in a standardized way. Patients were submitted to anamnesis, and validated questionnaires of sleep quality (PSQI-BR / The Pittsburgh Sleep Quality Index BR; SAQ / Sleep Assessment Questionnaire), sleepiness (ESS-BR / Epworth Sleepiness Scale BR, bruxism (QABN / Questionnaire nocturnal bruxism evaluation) and temporomandibular disorders (RDC / TMD axis I / Research Diagnostic Criteria for temporomandibular Disorders). The sleep bruxism was also measured with the validated myographic device BiteStrip. After sleeping one night with cardiorespiratory portable type 3 monitor ApneaLink? (ResMed, Australia) using the upper denture at home, a washout period of at least 7 days was respected and all questionnaires were repeated. Then, the patient slept again with the portable monitor and without the upper denture. The RDC / TMD axis I detected 95% of absence of muscle disorders in both tests. There was no significant difference in the SAQ global score between before and after according to the Wilcoxon signed rank test (2tail). PSQI-BR and ESS-BR also showed no significant differences between the two tests, except for the component number 5 of the PSQI-BR. Regarding sleep bruxism, the QABN and the myographic device BiteStrip also showed no significant differences between measurements with and without the use of dentures. Regarding cardiorespiratory monitoring in any of the indexes there was no significant difference between the before and after moments. The indexes measured were respiratory disturbance index (RDI), baseline oxygen saturation (%), average (%) and minimum (%), and oxygen saturation time < 90%, oxygen saturation percentage < 90% and the Oxygen desaturation index (ODI). It was noticed in RDI a difference in absolute numbers that could translate into statistically significant results if the sample were larger. Finally, no significant differences were recorded between before and after, neither in the questionnaires nor in the myographic device and the cardiorespiratory monitoring. Thus, further studies are needed in order to establish a more exact relationship between the use of complete dentures and their influence on sleep quality, sleepiness, temporomandibular disorders (TMD) and sleep bruxism. / A utiliza??o de pr?teses totais durante o sono ? ainda alvo de discuss?o. O uso ? indicado ou n?o de maneira bastante emp?rica, baseando-se apenas no controle de estomatites causadas principalmente por infec??es f?ngicas. O objetivo foi avaliar o impacto do edentulismo superior e consequente uso de pr?teses totais durante o sono na qualidade de vida, qualidade de sono, bruxismo do sono, disfun??o temporomandibular, n?vel de sonol?ncia e ?ndice de apneia em pacientes. Para isso, foram selecionados 20 pacientes da cl?nica particular do pesquisador, 90% mulheres e 10% homens, com idade m?dia de 61 anos. Os indiv?duos apresentaram Pr?teses Totais Convencionais superiores e Pr?teses Totais fixas Implantossuportadas inferiores adequadas e confeccionadas de maneira padronizada. Os pacientes foram submetidos ? anamnese, e a question?rios validados de qualidade de sono (PSQI-BR/The Pittsburgh Sleep Quality Index BR; SAQ/Sleep Assessment Questionnaire), sonol?ncia (ESS-BR/Epworth Sleepiness Scale BR, bruxismo (QABN/Question?rio de Avalia??o de Bruxismo Noturno) e disfun??o temporomandibular (RDC/TMD eixo I/Research Diagnostic Criteria for Temporomandibular Disorders). O bruxismo noturno tamb?m foi aferido com o dispositivo miogr?fico validado BiteStrip. Ap?s, dormiram uma noite com monitor cardiorrespirat?rio port?til tipo 3 ApneaLink? (ResMed, Australia) utilizando a pr?tese total superior em seu domic?lio. Respeitou-se um per?odo de washout de no m?nimo 7 dias para que todos os question?rios fossem repetidos e o paciente dormisse novamente com o monitor port?til e sem a pr?tese total. O RDC/TMD eixo I detectou 95% de aus?ncia de desordens musculares em ambos os exames. N?o houve diferen?a significativa no escore global do SAQ entre o antes e depois de acordo com o Wilcoxon signed ranks test (2tail). PSQI-BR e ESS-BR tamb?m n?o apresentaram diferen?as significativas entre os dois exames, com exce??o do componente 5 do PSQI-BR. Em rela??o ao bruxismo do sono, o QABN e o dispositivo miogr?fico BiteStrip tamb?m n?o apresentaram diferen?as significativas entre as medi??es com ou sem a utiliza??o da dentadura. Em rela??o ? monitora??o cardiorrespirat?ria, em nenhuma dos ?ndices houve diferen?a significativa entre o antes e o depois. As medi??es foram de ?ndice de Dist?rbios Respirat?rios (IDR), Satura??o de oxig?nio basal (%), m?dia (%) e m?nima (%), al?m de Tempo de satura??o de oxig?nio < 90%, porcentagem de satura??o de oxig?nio < 90% e o ?ndice de Dessatura??o de Oxig?nio (IDO). Percebeu-se no IDR uma diferen?a em n?meros absolutos que poderia se traduzir em estatisticamente significativa se a amostra fosse maior. Por fim, n?o foram registradas diferen?as significativas entre o antes e o depois, tanto nos question?rios quanto no dispositivo miogr?fico e monitoriza??o cardiorrespirat?ria port?til. Assim, mais estudos s?o necess?rios para que se estabele?a uma rela??o mais exata entre o uso de dentaduras completas e sua influ?ncia na qualidade de sono, sonol?ncia, desordens temporomandibulares (DTM) e bruxismo do sono.

Made available in DSpace on 2014-12-17T15:43:52Z (GMT). No. of bitstreams: 1 PatriciaNG_DISSERT.pdf: 2029374 bytes, checksum: 7beef1937e948bf118e34bf7f689b69b (MD5) Previous issue date: 2013-03-22 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Early childhood caries, especially in its severe form, which is characterized by an acute and aggressive nature, can have negative impacts on thequality of life of a child, due to effects such as difficulty in chewing, decreased appetite, weight loss, insomnia, changes in behavior and a decreased performance in school, among others. Moreover, the quality of life of the child`s family can also be affected, as the pain and discomfort caused by this type of caries result in loss of working days of parents, spending on dental treatments, changes in sleep patterns and stress. The aim of this study was to evaluate the impact of severe early childhood caries in the Oral Health-Related Quality of Life (OHRQoL) of public daycares`s preschool children through the Escala de Impacto da Sa?de Bucal na Primeira Inf?ncia, a Brazilian version of the Early Childhood Oral Health Impact Scale (ECOHIS). A single calibrated examiner (kappa=1.0) evaluated, through the dmfs index, the oral health of 116 children aged between 3 and 5, which were included in one of three study groups: "caries-free", "not-severe early childhood caries" and "severe early childhood caries". The parents responded to ECOHIS, to assess their perception regarding the OHRQoL of their children, and a questionnaire on socioeconomic conditions. The OHRQoL was measured through the total scores and domains of ECOHIS. Descriptive analysis, Mann-Whitney test, Kruskal-Wallis test, chi-square test and Poisson multiple regression with robust variance were used. Among the children observed, 38.8% were caries-free, 27.6% showed not-severe early childhood caries and 33.6% showed severe early childhood caries. Regarding the total score of ECOHIS, severe early childhood caries had a greater negative impact on OHRQoL, compared to caries-free and not-severe early childhood caries groups (p <0.001). Regarding the child subscale, there was significant difference between the "severe early childhood caries" group and the other groups in all domains, except for theone of self-image / social interaction. In the family subscale domains, there was statistical significance between the severe early childhood caries and the caries-free groups in all domains (p <0.001), whereas between the "severe early childhood caries and not-severe early childhood caries groups there was a statistically significant difference only in the domain of parental anguish (p <0.001). Multivariate analysis showed that early childhood caries and the parent`s age were significantly associated to OHRQoL (p <0.05), independently of the other variables in the model. The presence of severe early childhood caries resulted in greater negative impact on OHRQoL (AdjPR= 6.016; 95%CI = 3.12 11.56; p<0.001), while older parents reported better OHRQoL (AdjPR = 0.603; 95%CI = 0.428 - 0.850; p = 0.004). The presence of severe early childhood caries had a negative impact on OHRQoL of preschool children and their families. / A c?rie precoce na inf?ncia, especialmente a sua forma severa, caracterizada pela natureza aguda e agressiva, pode produzir impactos negativos na qualidade de vida da crian?a, como dificuldade na mastiga??o, diminui??o do apetite, perda de peso, dificuldade em dormir, altera??o no comportamento e diminui??o do rendimento escolar, entre outros. Al?m disso, a qualidade de vida da fam?lia da crian?a portadora desse tipo de c?rie tamb?m pode ser afetada, pois os quadros de dor e desconforto causados resultam em perdas de dias de trabalho dos pais, gastos com tratamentos odontol?gicos, altera??o nos padr?es de sono e estresse. O objetivo deste estudo foi avaliar o impacto da c?rie precoce severa na inf?ncia na Qualidade de Vida Relacionada ? Sa?de Bucal (QVRSB) de crian?as pr?-escolares de creches p?blicas por meio da Escala de Impacto da Sa?de Bucal na Primeira Inf?ncia, vers?o brasileira do Early Childhood Oral Health Impact Scale (ECOHIS). Um ?nico examinador calibrado (kappa=1,0) avaliou, por meio do ?ndice ceo-s, a sa?de bucal de 116 crian?as entre 3 e 5 anos de idade, as quais foram inclu?das em um dos tr?s grupos de estudo: livre de c?rie , c?rie precoce n?o severa e c?rie precoce severa . Os pais responderam ao ECOHIS, para avaliar sua percep??o em rela??o ? QVRSB de seus filhos, al?m de um question?rio sobre condi??es socioecon?micas. A QVRSB foi mensurada por meio dos escores total e por dom?nios do ECOHIS. An?lise descritiva, teste de Mann-Whitney, teste de Kruskal-Wallis, teste do quiquadrado e regress?o m?ltipla de Poisson com vari?ncia robusta foram utilizados. Dentre as crian?as avaliadas, 38,8% eram livres de c?rie, 27,6% apresentavam c?rie precoce n?o severa e 33,6% apresentavam c?rie precoce severa. Em rela??o ao escore total do ECOHIS, a c?rie precoce severa na inf?ncia teve um maior impacto negativo na QVRSB em compara??o aos grupos livre de c?rie e c?rie precoce n?o severa (p<0,001). Em rela??o ? subescala da crian?a, houve diferen?a estatisticamente significativa entre o grupo c?rie precoce severa e os outros grupos em todos os dom?nios, com exce??o do dom?nio de auto-imagem / intera??o social. Nos dom?nios da subescala da fam?lia, houve diferen?a significativa entre os grupos c?rie precoce severa e o livre de c?rie em todos os dom?nios (p<0,001); j? entre os grupos c?rie precoce severa e c?rie precoce n?o severa , houve diferen?a estatisticamente significativa somente no dom?nio de ang?stia dos pais (p<0,001). A an?lise multivariada mostrou que a c?rie precoce na inf?ncia e a idade dos pais foram significativamente associadas ? QVRSB (p<0,05), independentemente das demais vari?veis do modelo. A presen?a de c?rie precoce severa na inf?ncia resultou em maior impacto negativo sobre a QVRSB (RPaj=6,016; IC95% = 3,12 -11,56; p<0,001), enquanto pais mais velhos relataram melhor QVRSB (RPaj = 0,603; IC95% = 0,428-0,850; p = 0,004). A presen?a de c?rie precoce severa na inf?ncia teve um impacto negativo na QVRSB de crian?as pr?-escolares e de suas fam?lias

Made available in DSpace on 2014-12-17T15:43:54Z (GMT). No. of bitstreams: 1 CeliaAAS_DISSERT.pdf: 2988608 bytes, checksum: 5a7fdda483527741ad6df9d2c47ad611 (MD5) Previous issue date: 2013-08-23 / Among the non-invasive techniques employed in the prevention of caries highlights the sealing pits and fissures which is a conservative maneuver, in order to obliterate them to protect them from attack acid bacteria. Influenced by the studies of pre-heating composite resin, which has experienced great improvement in some of their physical properties, this study aimed to evaluate in vitro the superficial and internal marginal adaptation of different materials and sealants in pre-heating or not. A total of 40 extracted human third molars (n=10) that had their occlusal surfaces prepared to receive sealant. We tested two types of sealing materials: resin sealant (Fluoroshield) and low-viscosity resin (Permaflo), where 50% of previously received heated material and the other half received sealant material at room temperature. All samples were subjected to thermal cycling and pH, simulating a cariogenic oral environment, and later were analyzed appliance OCT (optical coherence tomography). The images obtained alterations were recorded and analyzed statistically. Change was considered as the emergence of bubbles, gaps and cracks in the sealant. Comparisons of the same material, assessing the fact that it is not sealed or preheated material, as well as comparisons between different materials subjected to the same temperature were carried out. The nonparametric Tukey test was used (p < 0,05). The results showed that there was statistically significant difference between both the materials analyzed, as between the situations in which the sealant material was submitted (preheated or not). On the issue of marginal adaptation and internal surface, seen through Optical coherence tomography, may suggest that there is a difference between the use of one type or another of the sealing material analyzed, with superiority attributed to resin Permaflo compared to sealant Fluroshield, telling is the same for the different techniques used / O selamento de f?ssulas e fissuras destaca-se entre as t?cnicas n?o invasivas empregadas na preven??o de c?ries. Consiste em uma manobra conservadora que as oblitera e protege da destrui??o dos ?cidos bacterianos. Influenciado pelos estudos de pr?-aquecimento das resinas compostas, em que se observou grande melhora em algumas de suas propriedades f?sicas, este trabalho objetivou analisar, in vitro, a adapta??o marginal superficial e interna de diferentes materiais seladores e em situa??es de pr? aquecimento ou n?o. Foram utilizados 40 terceiros molares humanos extra?dos (n=10), os quais tiveram suas superf?cies oclusais preparadas para receber o material selador. Foram testados dois tipos de materiais seladores: selante resinoso (Fluoroshield) e resina de baixa viscosidade (Permaflo). Dentre estes, 50% recebeu material aquecido previamente e a outra metade recebeu material selador em temperatura ambiente. Todas as amostras foram submetidas ? Ciclagem T?rmica e de pH, simulando um ambiente oral cariog?nico. Em seguida foram analisadas em aparelho de OCT (Tomografia de coer?ncia ?tica). As imagens obtidas tiveram suas altera??es registradas e analisadas estatisticamente. Como altera??o foi considerado o surgimento de bolhas e fendas. Compara??es para o mesmo material, avaliando o fato do mesmo ser ou n?o selado com material pr? aquecido, bem como compara??es entre os diferentes materiais submetidos ? mesma temperatura, foram realizadas. O teste n?o param?trico de Tukey foi empregado (p<0,05). Os resultados mostraram ter havido diferen?a estatisticamente significativa tanto entre os materiais analisados, como entre as situa??es em que o material selador foi submetido (pr? aquecido ou n?o). No quesito adapta??o marginal superficial e interna, visto atrav?s de Tomografia de Coer?ncia ?tica, pode-se sugerir que h? diferen?a entre o uso de um tipo ou outro dos materiais seladores analisados, com superioridade atribu?da ? resina Permaflo em rela??o ao selante Fluroshield, dizendo-se o mesmo em rela??o ?s diferentes t?cnicas utilizadas

Made available in DSpace on 2015-04-14T13:29:17Z (GMT). No. of bitstreams: 1 397726.pdf: 6415316 bytes, checksum: 94e18040fb876738a7854d94d6e2b15c (MD5) Previous issue date: 2007-12-13 / Os defeitos ?sseos podem decorrer de fatores como patologias, traumas e cirurgias. Dependendo de sua extens?o, o reparo ?sseo n?o acontece de forma espont?nea, necessitando o uso de enxertos. Os biomateriais t?m sido uma alternativa vi?vel como substitutos ?sseos. Dentre eles, destacam-se as biocer?micas pela sua biocompatibilidade, atoxicidade e propriedades osteocondutoras. Este estudo analisou comparativamente dois tipos de biocer?micas, cimento de &#945;-fosfato tric?lcico (&#945;&#8722;TCP) e gr?nulos de &#946;-fosfato tric?lcico-HA (&#946;-TCP/HA), inseridas em defeitos ?sseos cr?ticos confeccionados em calotas cranianas de 50 ratos (Rattus norvegicus albinus, Wistar), machos, adultos, com peso corporal m?dio de 300 a 400g. Os animais foram divididos em dois grupos com 25 animais: grupo-&#945; e grupo-&#946;/HA. Na calota craniana de cada animal, foram confeccionadas duas cavidades medindo 4 mm de di?metro cada. A cavidade esquerda foi preenchida pelo material correspondente de cada grupo e a cavidade direita foi preenchida por co?gulo sang??neo aut?geno, correspondendo ao grupo controle. Os animais foram mortos aos 7, 21, 60, 90 e 120 dias de p?s-operat?rio. Os ossos parietais contendo as cavidades foram removidos e as pe?as operat?rias submetidas a processamento histol?gico pela t?cnica de HE. Com aux?lio do software Image Pro Plus 6.2, foi realizada an?lise histomorfom?trica que permitiu mensurar a ?rea de osso neoformado dos defeitos nos diferentes per?odos de observa??o. Os resultados, expressos em porcentagem m?dia de ?rea do defeito preenchido por osso neoformado, no grupo &#945;&#8722;TCP foram: 1,6% (+ 2,37) aos 7 dias, 5,24% (+ 5,58) aos 21 dias, 24% (+ 14,5) aos 60 dias, 30,21% (+ 6,84) aos 90 dias e 50,59% (+ 5,42) aos 120 dias. No grupo &#946;&#8722;TCP/HA, os resultados foram de 1,94% (+ 3,10) aos 7 dias, 2,53% (+ 1,19) aos 21 dias, 12,47% (+ 3,87) aos 60 dias, 26,84% (+ 2,80) aos 90 dias e 38,82% (+ 8,76) aos 120 dias de p?s-operat?rio. No grupo controle, as m?dias dos resultados foram de 0,15% aos 7 dias, 10,12% aos 21 dias, 15,10% aos 60 dias, 18,94% aos 90 dias e 48,50% aos 120 dias. Conclui-se que o cimento &#945;-TCP e os gr?nulos &#946;&#8722;TCP/HA promovem osteocondu??o; o cimento &#945;-TCP ? mais sol?vel e apresenta maior porcentagem de ?rea de neoforma??o ?ssea. Os gr?nulos &#946;&#8722;TCP/HA s?o reabsorvidos mais lentamente, o que parece promover manuten??o do volume da regi?o implantada

Le travail présenté concerne les actionneurs électriques pour des applications sécuritaires dans l'automobile comme la direction ou le freinage. Dans un premier temps, un bilan des solutions existantes pour rendre un actionneur électrique tolérant aux fautes, et donc capable de fonctionner après l'apparition d'un défaut, a été fait. Le court-circuit interne dans le bobinage ayant été montré comme un des défauts les plus problématiques, l'étude s'est concentrée sur des méthodes pour estimer l'impact de ce défaut sur des machines bobinées sur dent à aimants permanents en surface. Une modélisation utilisant un logiciel d'étude par éléments finis est développée, puis différentes approches par formules analytiques sont exposées. Ces modélisations analytiques permettent d'obtenir des ordres de grandeurs du courant de court-circuit, du couple et du champ dans les aimants lors de l'apparition du court-circuit dans le bobinage

On précisera d'abord des conditions dans lesquelles apparaît tel ou tel type de fracture. On analysera ensuite les rapports existant entre les grands décrochements d'une région et la fracturation plus fine que l'on rencontre à leurs abords; puis on s'intéressera aux formes et aux mouvements des blocs découpés par ces fractures. Après avoir établi quelques modèles théoriques on tentera de les appliquer à l'étude des fracturations qui affectent d'une part un grand synclinal de la Chartreuse orientale et d'autre part un vaste plateau du Vercors sud oriental. Cette étude comportera deux étapes ; on recensera d' abord les fractures majeures puis, des mesures de terrain nous permettrons d'apprécier la fracturation plus fine de ces massifs. Ces derniers sont caractérisés par une tectonique simple: des plis à grand rayon de courbure, tronçonnés par des décrochements qui les prennent en écharpe . Le traitement des données ainsi acquises sera fait par filtrage optique pour l'interprétation photogéologique et par un programme original de traitement statistique pour les mesures de terrain permettant de reconnaitre automatiquement la forme des blocs découpés par les fractures. Puis en schématisant et en interprétant les résultats ainsi obtenus on essayera de conclure par un historique de l'évolution des déformations dans la région en tentant de reconstituer le rôle qu'a pu jouer le socle dans la tectonique de cette région. On devra pour cela se placer dans un cadre plus large que celui des massifs subalpins externes.

This thesis examines an automated method to detect surface deformations on automotive panels for the purpose of quality control along a manufacturing assembly line. Automation in the automotive manufacturing industry is becoming more prominent, but quality control is still largely performed by human workers. Quality control is important in the context of automotive body panels as deformations can occur along the assembly line such as inadequate handling of parts or tools around a vehicle during assembly, rack storage, and shipping from subcontractors. These defects are currently identified and marked, before panels are either rectified or discarded. This work attempts to develop an automated system to detect deformations to alleviate the dependence on human workers in quality control and improve performance by increasing speed and accuracy. Some techniques make use of an ideal CAD model behaving as a master work, and panels scanned on the assembly line are compared to this model to determine the location of deformations. This thesis presents a solution for detecting deformations of various scales without a master work. It also focuses on automated analysis requiring minimal intuitive operator-set parameters and provides the ability to classify the deformations as dings, which are deformations that protrude from the surface, or dents, which are depressions into the surface. A complete automated deformation detection system is proposed, comprised of a feature extraction module, segmentation module, and classification module, which outputs the locations of deformations when provided with the 3D mesh of an automotive panel. Two feature extraction techniques are proposed. The first is a general feature extraction technique for 3D meshes using octrees for multi-resolution analysis and evaluates the amount of surface variation to locate deformations. The second is specifically designed for the purpose of deformation detection, and analyzes multi-resolution cross-sections of a 3D mesh to locate deformations based on their estimated size. The performance of the proposed automated deformation detection system, and all of its sub-modules, is tested on a set of meshes which represent differing characteristics of deformations in surface panels, including deformations of different scales. Noisy, low resolution meshes are captured from a 3D acquisition, while artificial meshes are generated to simulate ideal acquisition conditions. The proposed system shows accurate results in both ideal situations as well as non-ideal situations under the condition of noise and complex surface curvature by extracting only the deformations of interest and accurately classifying them as dings or dents.

This thesis examines an automated method to detect surface deformations on automotive panels for the purpose of quality control along a manufacturing assembly line. Automation in the automotive manufacturing industry is becoming more prominent, but quality control is still largely performed by human workers. Quality control is important in the context of automotive body panels as deformations can occur along the assembly line such as inadequate handling of parts or tools around a vehicle during assembly, rack storage, and shipping from subcontractors. These defects are currently identified and marked, before panels are either rectified or discarded. This work attempts to develop an automated system to detect deformations to alleviate the dependence on human workers in quality control and improve performance by increasing speed and accuracy. Some techniques make use of an ideal CAD model behaving as a master work, and panels scanned on the assembly line are compared to this model to determine the location of deformations. This thesis presents a solution for detecting deformations of various scales without a master work. It also focuses on automated analysis requiring minimal intuitive operator-set parameters and provides the ability to classify the deformations as dings, which are deformations that protrude from the surface, or dents, which are depressions into the surface. A complete automated deformation detection system is proposed, comprised of a feature extraction module, segmentation module, and classification module, which outputs the locations of deformations when provided with the 3D mesh of an automotive panel. Two feature extraction techniques are proposed. The first is a general feature extraction technique for 3D meshes using octrees for multi-resolution analysis and evaluates the amount of surface variation to locate deformations. The second is specifically designed for the purpose of deformation detection, and analyzes multi-resolution cross-sections of a 3D mesh to locate deformations based on their estimated size. The performance of the proposed automated deformation detection system, and all of its sub-modules, is tested on a set of meshes which represent differing characteristics of deformations in surface panels, including deformations of different scales. Noisy, low resolution meshes are captured from a 3D acquisition, while artificial meshes are generated to simulate ideal acquisition conditions. The proposed system shows accurate results in both ideal situations as well as non-ideal situations under the condition of noise and complex surface curvature by extracting only the deformations of interest and accurately classifying them as dings or dents.

This thesis examines an automated method to detect surface deformations on automotive panels for the purpose of quality control along a manufacturing assembly line. Automation in the automotive manufacturing industry is becoming more prominent, but quality control is still largely performed by human workers. Quality control is important in the context of automotive body panels as deformations can occur along the assembly line such as inadequate handling of parts or tools around a vehicle during assembly, rack storage, and shipping from subcontractors. These defects are currently identified and marked, before panels are either rectified or discarded. This work attempts to develop an automated system to detect deformations to alleviate the dependence on human workers in quality control and improve performance by increasing speed and accuracy. Some techniques make use of an ideal CAD model behaving as a master work, and panels scanned on the assembly line are compared to this model to determine the location of deformations. This thesis presents a solution for detecting deformations of various scales without a master work. It also focuses on automated analysis requiring minimal intuitive operator-set parameters and provides the ability to classify the deformations as dings, which are deformations that protrude from the surface, or dents, which are depressions into the surface. A complete automated deformation detection system is proposed, comprised of a feature extraction module, segmentation module, and classification module, which outputs the locations of deformations when provided with the 3D mesh of an automotive panel. Two feature extraction techniques are proposed. The first is a general feature extraction technique for 3D meshes using octrees for multi-resolution analysis and evaluates the amount of surface variation to locate deformations. The second is specifically designed for the purpose of deformation detection, and analyzes multi-resolution cross-sections of a 3D mesh to locate deformations based on their estimated size. The performance of the proposed automated deformation detection system, and all of its sub-modules, is tested on a set of meshes which represent differing characteristics of deformations in surface panels, including deformations of different scales. Noisy, low resolution meshes are captured from a 3D acquisition, while artificial meshes are generated to simulate ideal acquisition conditions. The proposed system shows accurate results in both ideal situations as well as non-ideal situations under the condition of noise and complex surface curvature by extracting only the deformations of interest and accurately classifying them as dings or dents.