Thesis (M.S.)--California State University, Long Beach, 1999. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--California State University, Long Beach, 1999. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (doctoral)--Karolinska Institutet, Stockholm, 1983. / Extra t.p. with thesis statement inserted. Includes the author's six articles published in various journals. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.D.Sc) - University of Queensland, 2004. / Includes bibliography.

Thesis (M. Orth.)--University of Hong Kong, 2005.

Made available in DSpace on 2014-06-11T19:27:54Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-12-13Bitstream added on 2014-06-13T18:32:11Z : No. of bitstreams: 1 lugato_icpt_me_araca.pdf: 1008270 bytes, checksum: 7cc1d52035ea072ea1322a76285600d5 (MD5) / Universidade Estadual Paulista (UNESP) / Estabilidade da colagem dos acessórios ortodônticos durante o tratamento pode ser influenciado por vários fatores, dentre eles, o sistema de colagem eleito e o0 tipo de bráquete. Frente à importância de se elucidar ao máximo possível a respeito destas variáveis, esta pesquisa foi encetada com o propósito de comparar in vitro a resistência ao cisalhamento de bráquetes metálicos ortodônticos (AbZIL-LANCER) com bases em malha convencional e bráquetes com bases em malha pré-tratadas industrialmente com jateamento de óxido de alumínio. Para a realização deste trabalho, duzentos e quarenta incisivos bovinos foram selecionados e divididos aleatoriamente em seis grupos de quarenta cada (n = 40), segundo o tipo de base do bráquete e o material de colagem utilizado. Os acessórios (AbZIL.LANCER) foram diretamente colados nos dentes bovinos com três sistemas adesivos: Sistema A - resina fotopolimerizante Transbond XT convencional (3M - Unitek, St Paul, Mn, U.S.A.); Sistema B - TransbondTM Plus Self Etching Primer (SEP) + Transbond XT (3M - Unitek, St Paul, Mn,U.S.A.) e Sistema C - cimento de ionômero de vidro resinoso Fuji ORTHO LC em cápsulas (GC Corp., Tokyo, Japan). Os testes de cisalhamento foram realizados 24 horas após a colagem dos bráquetes, utilizando uma máquina universal de ensaios DL-3000 (EMIC - Equipamentos e Sistemas de Ensaio Ltda.), utilizando célula de carga de 200 Kgf e velocidade de 1mm/min. Os resultados obtidos foram submetidos aos testes estatísticos ANOVA a dois critérios e TUKEY, ambos em nível de significância a 5%. A análise estatística demonstrou não haver diferenças estatisticamente significante entre os resultados dos testes de cisalhamento das bases comparadas. Contudo, os valores encontrados revelaram diferenças espressivas no desenpenho dos sistemas de colagem, tendo o Sistema A - (14,92MPa) apresentado os resultados mais satisfatórios... / Despite of the high-quality materials for orthodontic bonding have, an ideal bonding system has not been developed yet. The aim of this study was to test shear bond strength of two types of brackets bases. Two hundred and forty bovine incisors were randomly divided into 6 groups, according to the type of foil mesh (sandblasted or not) and the bonding materials. Brackets (AbZIL.LANCER) were directly bonded to teeth with 3 different bonding systems: System A - light-cured resin TransbondTM XT conventional XT (3M-Unitek, St Paul, Mn, U.S.A.); System B -TransbondTM XT + TransbondTM Plus Self Etching Primer (3M-Unitek, St Paul, Mn, U.S.A.) and System C - reinforced glass ionomer orthodontic cement Fuji ORTHO LC in capsules (GC Corp., Tokyo, Japan). The tests were performed 24 hours after bonding procedure in a DL 3000 (EMIC) testing machine, with a load cell of 200 Kgf in a 1mm/min speed. Results were analyzed by ANOVA and TUKEY tests at 5% of significance level. There were no statistical differences between the two types of brackets. However, there were statistical differences related to the bonding materials. Tukey's test revealed that System A presented the best shear bond strength (14,92MPa), followed by Systems B (10,66MPa) and C (13,24MPa), but there were not significantly differences between Systems A... (Complete abstract, click electronic address below)

Resumo: O objetivo deste trabalho foi medir médias para algumas medidas intra e interarcos em modelos de gesso da população brasileira branca portadora de oclusão normal. Para isso, 51 modelos de oclusão normal foram digitalizados tridimensionalmente com o Microscribe duas vezes com um espaço de sete dias entre as digitações para avaliação do erro do método. Os dados conseguidos foram então trabalhados através do programa Tigaro. A estatística para estimar-se as médias foi realizada através da análise de modelo multinível e os erros sistemático e casual foram calculados através dos teste T- student e pela fórmula de Dahlberg, respectivamente. Como resultado foram estabelecidas estimativas das médias para a população brasileira com oclusão normal das distâncias intercaninos, intermolares, inter 1os pré-molares e inter 2os pré-molares, comprimento de arco, torques e inclinações dentárias, espessuras dos dentes no terço médio, altura de cúspides, profundidade da curva de Spee, overjet e overbite, angulação entre os planos oclusais, desvio de linha média e as diferenças entre as bordas oclusais dos dentes anteriores. Também a partir deste estudo, determinou-se um formato de arco padrão para a amostra estudada, que pode ser utilizado como template para arcos em ortodontia... (Resumo completo, clicar acesso eletrônico abaixo). / Abstract: The aim of this paper was to measure the average of some intra and interarches measurements in cast models of the white brazilian population with normal occlusion. In order to achieve this objective, 51 models were digitized threedimensionally with a Microscribe twice seven days apart for method error evaluation. The collected data was then worked on the software Tigaro. The statistics used was the multilevel models analysis in order to estimated the means for the measures and the systematic and random error were calculated through the t-student test and Dahlberg's formula, respectively. As a result estimated means of intercanine, intermolar and interpremolar widths, arch length, torques and inclinations, teeth mid-third widths, cusp height, deepness of the curve of Spee, overjet and overbite, angulation between the planes of occlusion, mid-line deviation and the differences of the heights of the incisal borders of the anterior teeth were established for the white brazilian population with normal occlusion. Also, through this study a pattern of arch form was established for the sample studied, that can be used as a template for orthodontic arches. / Orientador: Luiz Gonzaga Gandini Júnior / Coorientador: Haruaki Hayasaki / Banca: Ary dos Santos Pinto / Banca: Adriano Marotta Araújo / Mestre

Indiana University-Purdue University Indianapolis (IUPUI) / It was the purpose of this study to discover if anteroposterior movement of the maxillary bones was possible. Seven cats were used as the experimental animals. An expansion device which produced a diagonal force from one maxillary cuspid to the opposite molar was inserted in five of the animals. Two animals were used as controls. The effects of the lateral and antero-posterior components of the force were studied by means of before and after models, oriented occlusal radiographs, and histologic sections. Antero-posterior movement did occur. The anterior movement was more evident than the posterior movement due to the response evoked in the premaxillary-maxillary and the maxillary-palatine sutures. The sutures which were compressed showed very little response when viewed in horizontal histologic sections as compared to the sutures which were under tension. The sutures under tension showed marked osteophytic production which generally grew parallel to the line of force application. This difference in response allowed one side to remain as an anchorage unit while the opposite side moved anteriorly. The lateral increase in width appeared to be stable. In one animal the force was removed for thirty six days prior to sacrifice. In this animal the stability of the antero-posterior movement was questionable.

Objectives: This pilot study aimed to determine the effect of the addition of an assessment to online course material on performance and self-efficacy of pre-doctoral students tasked with recognizing and diagnosing malocclusions on patients in the orthodontic screening clinic. Methods: Third year dental students completed an online module to reinforce concepts from the didactic curriculum prior to examining orthodontic patients. The experimental group (n=60) completed online case-based assessments before and after viewing an online module and then screened orthodontic patients. The control group (n=60) only viewed the online module prior to screening patients. The two groups were compared based on their average performance scores for diagnosis of various malocclusions, including but not limited to: dental developmental stage, crossbites, Angle molar classification, deep versus open bites, arch perimeter discrepancies, skeletal classification, and recommendation for orthodontic management. Additionally, differences in self-efficacy were assessed using a 5 question survey before and after screening orthodontic patients. Orthodontic residents were calibrated twice to ensure inter-rater reliability of student performance. Results: Performance: Results of a t-test showed a statistically significant increase in total assessment score in the experimental group when compared with the control group (p=0.047). Three out of ten questions had statistically significantly higher mean scores in the experimental group compared to the control group: vertical bite dimension (p=0.004), crowding and spacing in the mandibular arch (p=0.049), and vertical skeletal type (p=0.023). Self-Efficacy: The mean self-efficacy scores increased after completion of clinical requirements in both groups, with a pre-screening mean of 3.39 (SD=0.64) and post-screening mean of 4.39 (SD=0.41) in the control group and a pre-screening mean of 3.08 (SD=0.56) and post-screening mean of 4.28 (SD=0.37) in the experimental group. The self-efficacy scores were lower in the experimental group overall. The increase in self-efficacy was greater in the experimental group. Conclusions: The assessments added to online course content in this pilot study produced a statistically significant improvement in overall performance scores. Students demonstrated improved performance in the areas of diagnosis of vertical bite dimension, vertical skeletal type, and crowding and spacing in the mandibular arch. This study illustrates that the addition of an assessment to online course content could improve student learning outcomes related to diagnosis of dental and skeletal malocclusions and arch perimeter discrepancies. This pilot study shows that the addition of an online assessment lead to a greater improvement in self-efficacy scores. The addition of an online assessment also lead to lower self-efficacy scores overall. Qualitative follow up suggests that the students in the experimental group were more aware of the gaps in their knowledge. The creation of online assessments by orthodontic faculty can be used to overcome the faculty shortage in the field. / Oral Biology

Introduction: Orthodontists increasingly rely on digital models in clinical practice. The ability of modern scanners to articulate digital models must be scientifically evaluated. Methods:Twenty five digital articulated models were produced from four digital scanners in five experimental groups. The resulting inter-arch measurements were compared to the gold standard. An acceptable range of 0.5mm more or less than the gold standard was used for evaluation. Results: iTero® and iTero® Element yielded all acceptable inter-arch measurements. The 3M™ True Definition and Ortho Insight 3D® with Regisil® bite registration produced four of six acceptable inter-arch measurements. The Ortho Insight 3D® with Coprwax ™ bite registration yielded three of six acceptable inter-ach measurements. Conclusions: The iTero® and iTero® Element produced the most accurately articulated models. The 3M™ True Definition and Ortho Insight 3D® with Regisil® were the next most accurate. The Ortho Insight 3D® scanner with Coprwax ™ was the least accurate method tested.