Orientadores: Marcio Zaffalon Casati, João Batista Cesar Neto / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-15T00:47:10Z (GMT). No. of bitstreams: 1 Lima_LianaLinhares_D.pdf: 1779418 bytes, checksum: 5170e97149f324c7dae9d9edd2c763fb (MD5) Previous issue date: 2009 / Resumo: O objetivo do presente estudo foi avaliar histometricamente a influência do PTH (1-34) sobre o reparo ósseo e osseointegração de implantes de titânio instalados em tíbias de ratas expostas ou não à inalação da fumaça de cigarro. Foram utilizadas 61 ratas Wistar adultas aleatoriamente divididas em: grupo 1 (n=15) : animais que receberam a aplicação do veículo necessário para a dissolução do hormônio após a instalação do implante; grupo 2 (n=16) : inalação de fumaça de cigarro (IFC) por 60 dias no pré e pós-operatório da colocação do implante; grupo 3 (n = 17): tratamento do grupo 2 associado à injeções subcutâneas de 40 fxg/kg de PTH sintético (1-34) três vezes por semana, após a colocação do implante e grupo 4 (n=13) : injeções subcutâneas de 40 Hg/kg de PTH sintético (1-34) três vezes por semana após a instalação dos implantes. Os animais foram sacrificados sessenta dias após a colocação dos implantes, secções não descalcificadas foram obtidas e avaliadas histometricamente, segundo os seguintes parâmetros: porcentagem de tecido ósseo em contato direto com a superfície do implante (CD), porcentagem de preenchimento ósseo das roscas do implante (AO) e porcentagem de tecido mineralizado numa zona de 500 um, adjacente à superfície do implante (PTM). Os parâmetros foram obtidos separadamente para região cortical e região medular. Não foram detectadas diferenças entre os grupos que receberam aplicação de PTH (1-34) (Grupos 3 e 4) em todos os parâmetros avaliados (p>0,05). Além disso, o PTH promoveu um aumento significativo no CD, AO e PTM em ambas as regiões, mesmo na presença de IFC (p<0.05) (exceto para AO na região cortical). Uma influência negativa da IFC foi observada para o parâmetro CD na região cortical, uma vez que o grupo 2 apresentou os menores valores de CD, seguidos do grupo 1. Resultados semelhantes foram observados para PTM em ambas as regiões analisadas. Dentro dos limites deste estudo pode-se concluir que a aplicação intermitente de PTH (1-34) é capaz de minimizar os impactos negativos da inalação da fumaça de cigarro na osseointegração de implantes de titânio inseridos em tíbias de ratas. / Abstract: The aim of this study was to investigate the synthetic parathyroid hormone, PTH (1-34), can mitigate the effect of cigarette smoke inhalation (CSI) on the bone healing around titanium implants inserted in rats. 61 female Wistar rats were randomly assigned to one of four groups: group l(n = 15): animals that received the application of the necessary vehicle for the dissolution of the hormone after installation of the implant; group 2 (n = 16): cigarette smoke inhalation (CSI) for 60 days preoperatively and sixty days after implant placement group 3(n = 17), treatment group 2, associated with subcutaneous injections of 40 u-g / kg of synthetic PTH (1-34) three times a week after implant placement and group 4 (n = 13): subcutaneous injections of 40 ug / kg of synthetic PTH (1-34) three times a week after placement of implants. The animals were sacrificed sixty days after the placement of implants, not decalcified sections were obtained and evaluated histometrically, according to the following parameters: percentage of bone tissue in direct contact with the implant surface (BIC), percentage of bone filling the threads of the implant (BF) and percentage of mineralized tissue in an area of 500 urn adjacent to the implant surface (BA). The parameters were obtained separately for the cortical and cancellous bone. No differences were found between the groups that received PTH (1-34) (Groups 3 and 4) in all evaluations (p> 0.05). In addition, PTH (1-34) caused a significant increase in BIC, BF and BA in both regions, even in the presence of CSI (p <0.05) (except for BF in the cortical region). A negative influence of the IFC was observed for the parameter BIC in the cortical region, as group 2 had the lowest values of BIC, followed by group 1. Similar results were observed for BA in both regions analyzed. Within the limits of this study can conclude that the intermittent application of PTH (1-34) is able to reversing the negative effects of cigarette smoke inhalation on osseointegration of titanium implants inserted in rats. / Doutorado / Periodontia / Doutor em Clínica Odontológica

Orientador: Solange Maria de Almeida / Tese (doutorado) - Universidade Estadual de Campinas. Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-15T20:48:17Z (GMT). No. of bitstreams: 1 Menezes_AlynneVieirade_D.pdf: 1911461 bytes, checksum: 9eed499fb3fe7db23a7c4de2811423d3 (MD5) Previous issue date: 2010 / Resumo: A utilização de implantes dentários para a reabilitação de regiões edêntulas é uma das atividades mais crescentes da Odontologia e a utilização de imagens é um fator essencial para se alcançar o almejado sucesso. Vários métodos de imagem vêm sendo utilizados com esse propósito e a tomografia computadorizada de feixe cônico (TCFC) vem se estabelecendo como um dos métodos promissores nesse sentido, pois se trata de um método confiável, capaz de produzir imagens em tamanho real, sem sobreposição e com dose de radiação menor que a tomografia computadorizada fan beam. Neste trabalho teve-se como objetivo avaliar a influência da posição da mandíbula na realização de medidas da altura e da espessura de sítios implantares em cortes ortorradiais de TCFC. Para tanto, foram utilizadas 10 mandíbulas maceradas, sendo obtidas imagens utilizando-se o tomógrafo de feixe cônico i-CAT. Foi realizada uma única imagem de cada mandíbula e a partir dessa imagem, os cortes ortorradiais foram obtidos considerando-se 3 diferentes posições: 1: base da mandíbula paralela ao plano horizontal (Posição Normal - PN); 2: base com inclinação de +10° (Posição Superior - PS) e 3: com inclinação de -10° (Posição Inferior - PI). A altura e a espessura óssea de cada região foram mensuradas por um único examinador e os dados obtidos nos grupos experimentais (PS e PI) foram comparados com os dados obtidos do grupo controle (PN) usando a análise de variância two-way (a=0,05). Os valores médios de altura e de espessura ósseas não variaram significativamente entre as posições inclinadas (PS e PI) e a posição padrão (PN), o que permite concluir que nas inclinações avaliadas, a direção do plano axial não influenciou nas medidas obtidas / Abstract: Dental implants have became part of routine treatment plans in many cases of edentulous patients and an important part of preimplant examination is provided by images of the existing bone structures in addition to the clinical findings. Several imaging modalities have been used for preimplant assessment and the cone-beam computed tomography may indeed be the next major advancement, since provides clinicians with accurate images of high diagnostic quality with relatively short scanning times and a reported radiation dose lower than fan beam computed tomography. The aim of this present study was to investigate the influence of mandibular inclination on the measured height and width of the cortical bone in reformatted cross-sectional cone beam computed tomography. Ten human dry mandibles were scanned with dental CBCT (i-CAT). It was performed only one scan of any mandible and reformatted cross-sectional scans were obtained at three different positions: (1) parallel to the lower border of the mandible (standard position); (2) with a inclination of +10° (Upper Position) and (3) with a n inclination of -10°(Lower Position). The alveolar bone height and width were measured for one examiner and data subjected to two-way analysis of variance and to compare the means obtained for the experimental groups (UP and LP) with the control group (standard position) (a=0,05). Mean values of bone height and width did not varied significantly between the inclined (UP and LP) and the standard positions. It could be concluded that in the positions analyzed, the direction of the axial planes did not influence the measurements obtained / Doutorado / Radiologia Odontologica / Doutor em Radiologia Odontológica

Magister Chirurgiae Dentium - MChD / The purpose of this study was to investigate the stress produced around the angled distal implants under simulated occlusal loading in the All-on-Four&ordf; concept by means of two-dimensional photoelastic stress models. / South Africa

Thesis (MSc (Radiography))--Cape Peninsula University of Technology, 2018. / Introduction: Forensic dentistry plays a key role in identifying human remains that cannot be identified visually or by other means. Studies have shown that in cases of single or multiple deaths, scientific identification of human remains utilising forensic dentistry is often the most successful source of identification. Dental identification of human remains consists of a very complex procedure that makes it necessary during the investigation process to use and compare unique dental identifiers. A reliable and accurate method of identifying human remains is a positive radiological identification between ante-mortem and post-mortem images of dental radiographic images. Even if ante-mortem radiographic images may not be present during the identification process, post-mortem images may include details of dental restorations such as dental implants which cannot be seen during visual examination. The different types of dental implants vary in morphology and in conjunction with the unique appearance of dental anatomy and the placement of custom restorations such as dental implants, it has been found to accurately assist in the identification of human remains. Objectives: To establish a radiographic dental implant guide for ten commonly used dental implant types in the Western Cape, South Africa; and to identify and describe the morphological characteristics of these dental implant types as observed on pantomographs. Methods: The ten commonly used dental implant types were imaged radiographically to create a reference instrument which served as a tool for identifying and comparing different types of dental implants. The morphologies of the different dental implants, specifically the apex, thread and neck, were observed on ante-mortem pantomographs and compared to the appearance of the dental implants on the reference instrument to make a positive match. The straight tube image of all ten dental implant types in the reference instrument was used as the point of reference to positively identify the morphological characteristics of each dental implant type on the pantomographs. The morphological characteristics of the ten commonly used dental implant types used in the Western Cape were described and based on this a radiographic dental implant guide was developed. Results: A total of 384 dental implants were observed on the pantomographs. Of these, 380 dental implants could be positively identified on the pantomographs while 4 dental implants could not. A total of 350 dental implants (91%) were identified as dental implant types listed in the reference instrument while 30 dental implants were identified as a dental implant type not listed in the reference instrument. A total of 208 dental implants (54.2%) could be positively identified using the morphological characteristics namely the apex, thread and neck on the straight tube images of the dental implant type in the reference instrument. The radiographic dental implant guide was developed based on positive identification of the morphological characteristics of the dental implant types. Conclusion: This research study has illustrated that the morphology of dental implants can be used to differentiate between different dental implant types on pantomographs. Each dental implant type had unique morphological characteristics as well as similarities which enabled distinction between the different dental implant types, which facilitated dental implant identification and the development of a radiographic dental implant guide. The radiographic dental implant guide developed as part of this research study, may be useful in the field of forensic dentistry and forensic radiology.

published_or_final_version / Dental Surgery / Master / Master of Dental Surgery

Thesis (M.S.)--University of Michigan, 1972.

Thesis (Ph. D.)--Rensselaer Polytechnic Institute, Troy, New York, 1992. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p. 184-200).

Thesis (M. Sc.)--University of Toronto, 1996. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--University of Michigan, 2006. / Includes bibliographical references.

Thesis (M.S.)--University of Michigan, 1972.