Dissertations / Theses on the topic 'Bones Histology'
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Bogoevski, Kristofor. "A comprehensive evaluation of a rapid decalcification method for bones: A histological analysis." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/95917/1/Kristofor_Bogoevski_Thesis.pdf.
Full textCoraça, Debora Cristina. "Estudo experimental de implantes bioabsorviveis de poli(L-acido latico) / poli(oxido de etileno) associados ao cloridrato de vancomicina no reparo osseo." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/313584.
Full textTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Ciencias Medicas
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Resumo: A necessidade da utilização de enxertos naturais e/ou materiais sintéticos para auxiliar no reparo ósseo é diretamente proporcional a perda tecidual nas lesões. A administração de substâncias antibióticas é necessária para prevenir, ou mesmo combater a ação de agentes bacterianos que possam vir a retardar o reparo tecidual. Este estudo teve como objetivo avaliar a aplicação de um polímero bioabsorvível associado à uma droga antobiótica na regenereção óssea. Foram realizados implantes ósseos de microesferas da blenda de poli(L-ácido lático)PLLA/poli(óxido de etileno)PEO na composição 80:20 associadas ao cloridrato de vancomicina e não associados ao cloridrato de vancomicina em ratos. Os implantes foram colocados em cavidades de 3 mm de diâmetro realizadas em tíbias de ratos da linhagem Wistar. Grupos com 5 animais cada. foram submetidos a períodos experimentais de 2 e 4 dias e 1, 2, 4, 8, 16 e 32 semanas. Os achados morfológicos foram semelhantes em ambos grupos. Houve primeiramente a formação de malha de fibrina e hemorragia ao redor das microesferas, as quais foram gradualmente sendo substituídas por tecido de granulação. A partir do quarto dia, houve a formação inicial de matriz óssea envolvendo as microesferas centripetamente, tornando-se mais evidente e madura da primeira até a trigésima segunda semana de implantação. A comparação entre os achados histomorfométricos e semí-quantitativos, quanto à formação óssea, demonstraram não ter havido diferença significativa entre os dois grupos. Reações de rejeição tecidual não foram observadas. Pode-se concluir, portanto, que além da evidente osteointegração das microesferas de PLLA/PEO, a associação com o cloridrato de vancomicina não prejudicou a regeneração óssea podendo ser este material utilizado como enxerto, bem como ser útil na prevenção de infecções bacterianas
Abstract: The use of natural graft and synthetic materials to help bone regeneration is directly relative to cause of bone injury and bone requirement to compose a graft. The antibiotics drugs management is necessary to prevent and combat bacterial agents that could retard the tissue repair The aim of this study was to evaluate the bioabsorbable polymeric implants antibiotic associated behavior during the bone healing. Poly(L-lactic acid)PLLA/poly(ethylene oxide)PEO microspheres blends 80:20 vancomicyn associated bone implants, was compared with PLLA/PEO blend without vancomycin. The implants were inserted in a 3 mm proximal tibiae defect in adult Wistar rats. Periods from 2 and 4 days and 1. 2, 4, 8 16 and 32 weeks were evaluated in 5 animals per group. The histological findings were similar among groups. A fibrin net and hemorrhage were observed primarily around the microspheres and both were progressively replaced by granulation tissue. In four-day implant, the initial bone formation around microspheres was noted. The growth of bone tissue was initially characterized by wolven bone with progressive maturation to lamellar bone, centripetally to microspheres group. The quantity of new bone growth, measured by histomorphometric method and semi-quantitative analysis showed no differences between groups in each experimental interval. Therefore we conclude that mixing vancomycin chloridrate into PLLA/PEO microspheres did not affect the bone regeneration. Besides, the PLLA/PEO vancomycin associated microspheres allowed the osteointegration. For those reasons, the material could be used as bone graft, helping the bone repair In addiction, the associating with antibiotic drugs could be useful to prevent infections during bone healing
Doutorado
Ciencias Biomedicas
Doutor em Ciências Médicas
Nor, Faridah M. "A comparative microscopic study of human and non-human long bone histology." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/4463.
Full textNor, Faridah Mohd. "A comparative microscopic study of human and non-human long bone histology." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/4463.
Full textNacarino, Meneses Carmen. "Life history inferences in extant and extinct Equus from the histological analysis of bone and enamel tissues." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/664248.
Full textThe study of life histories provides valuable insights into many aspects of a species’ biology and ecology, including the ecological conditions of its ecosystem, its biodiversity, its demography and its vulnerability to extinction. Life histories of extant and extinct vertebrates can be reconstructed from bone and dental microstructure. However, histological research in key mammalian groups for paleontology and ecology, such as equids, is still little explored. The present PhD thesis aims to analyze bone and dental histology in extant and extinct Equus to obtain information about their most important life history and biological traits. The extant sample of the present dissertation comprises bones and teeth of Asiatic wild ass, plains zebra and Grevy’s zebra. Their detailed histological study has provided a solid framework for the subsequent analysis of fossil Equus species, which has been limited here to Middle and Late Pleistocene taxa. Results obtained from bone histology in living equids show that bone tissue types vary through ontogeny, recording individual growth. This dissertation also indicates that changes in bone tissue types are related to certain life history characteristics. Thus, for instance, results of this thesis reveal that the transition from fibrolamellar to lamellar bone (i.e. external fundamental system) in equid femora is associated with the onset of reproductive maturity. Key life history events, such as the moment of birth, are also registered in the bone tissue of equids. For the first time in mammals, the present dissertation describes a non-cyclical bone growth mark in the limb bones of equids whose timing of deposition agrees with a period of growth arrest/decline during birth in foals (neonatal line). This discovery is of high importance for the histological reconstruction of life histories in extant and extinct mammals. Bone skeletochronology in extant Equus further reveals that the femur is the best bone to obtain life history data in equids, and that bone growth curves yield information about skeletal maturity. On the other hand, the counting of incremental markings of daily periodicity in equid enamel yields new estimates of daily secretion rates for these mammals that invalidate previous inaccurate studies. The detailed study of dental enamel in first lower molars of extant Equus also shows that the development of this tooth involves three different stages. Each of them presents a specific rate and pattern of growth, and is related to ontogenetic and structural modifications of the tooth. The histological analysis performed here further indicates that enamel extends beyond the molar’s cervix in equids, hampering measurements of the crown height from the external appearance of the tooth. Results of this thesis also reveals that the time of first lower molar crown formation in the Asiatic wild ass doubles that of the African zebras, probably due to differences in habitat and longevity among these species. Dental histology further yields information about rates of wear in equids, indicating much higher wear rates for the first lower molar early in ontogeny than commonly thought. In a first attempt to reconstruct the life history of extinct Equus, bone histology was analyzed in the Middle Pleistocene species E. steinheimensis and E. mosbachensis and dental enamel was studied in the Late Pleistocene taxa E. ferus and E. hydruntinus. The preliminary findings obtained from these investigations allowed the first analysis of the body size trend towards dwarfing in European Pleistocene Equus under a life history perspective. First results indicate that larger Middle Pleistocene equids grew at higher rates than smaller Late Pleistocene and extant species. This finding agrees with published paleoenvironmental reconstructions and conforms to life history models that propose resource availability as one of the main selection pressures influencing adult body size.
Souza, Caio Gonçalves de. "Análise histomorfométrica do colo femoral em pacientes com e sem fratura do colo do fêmur." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/5/5140/tde-24012008-142245/.
Full textA histomorphometry evaluation of the trabecular part of the femoral neck was performed in 13 women over 60 years old submitted to hip arthroplasty. Seven of these patients had a femoral neck fracture. The bone mineral density showed no difference between both groups. The average thickness did not have significant between both groups, but the trabecular separation was higher and the number of trabecular bone was lower in the fracture group.
Pacheco, Andrielle de Bitencourt. "AVALIAÇÃO ANTROPOSCÓPICA E CEFALOMÉTRICA DO PERFIL E DA TENDÊNCIA FACIAL E SUA RELAÇÃO COM AS FUNÇÕES ESTOMATOGNÁTICAS." Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/6547.
Full textIntroduction: the profile and the facial tendency constitute the variation of bone and muscle structures of the individual, and may influence directly in the chewing, swallowing and breathing functions. Thus, the evaluation of these aspects is essential for Orofacial clinical work. The aim of this study was to investigate the correlation between the cephalometric and anthrophoscopic evaluation on the classification of profile and facial tendency, as well as to evaluate the association of these skeletal features with the functions of the stomatognathic system. Method: the sample consisted of 35 childrens, aged between six and twelve years, undergoing anthroposcopic evaluation with photographic documentation, with cephalometric and otorhinolaryngology evaluation. To verify the agreement between cephalometric and anthroposcopic evaluation was used the Kappa test. The association between profile and the facial tendency with the stomatognathic changes was analyzed using the Qui-square and Fisher Exact Test. Was adopted a significance level of p <0.05 for all tests. Results: the concordance among the judges in the classification of profile and the facial tendency was moderate. The concordance between the cephalometric and anthroposcopic evaluation as to profile was not possible as to analyze and the tendency was weak. Was observed good concordance between judges for the chewing variables and weak concordance for the swallowing variables. Was not found significant association between stomatognathic function and no association was found between stomatognathic functions with the facial profile and tendency. Conclusion: concludes that assessments and cephalometric antroposcópica differ and that changes stomatognathic not depend only on a few isolated variables.
Introdução: o perfil e a tendência facial constituem a variação de estruturas ósseas e musculares do indivíduo podendo influenciar diretamente nas funções de mastigação, deglutição e respiração. Por essa razão, a avaliação destes aspectos é essencial para a atuação clínica em motricidade orofacial. O objetivo deste estudo foi verificar a concordância entre a avaliação antroposcópica e cefalométrica quanto à classificação do perfil e da tendência facial, bem como, analisar a associação dessas características esqueléticas com as funções do sistema estomatognático. Metodologia: a amostra foi constituída por 35 crianças, com idades entre seis e doze anos, submetidas à avaliação antroposcópica com documentação fotográfica, avaliação cefalométrica e otorrinolaringológica. Para verificar a concordância entre as avaliações antroposcópica e cefalométrica utilizou-se o teste Kappa. A associação entre perfil e tendência facial com as alterações estomatognáticas foi analisada através dos testes Qui-Quadrado e Teste Exato de Fischer. Adotou-se nível de significância p<0,05 para todos os testes. Resultados: a concordância entre as juízas na classificação do perfil e da tendência facial foi moderada. A concordância entre as avaliações antroposcópica e cefalométrica quanto ao perfil não foi possível analisar e, quanto à tendência, foi fraca. Observou-se boa concordância entre juízas para as variáveis da mastigação e concordância fraca para as da deglutição e não foi encontrada associação entre funções estomatognáticas com o perfil e a tendência facial. Conclusão: conclui-se que as avaliações antroposcópica e cefalométrica diferem em relação ao perfil e à tendência facial e que as alterações estomatognáticas não dependem apenas das variáveis analisadas.
Miszkiewicz, Justyna J. "Ancient human bone histology and behaviour." Thesis, University of Kent, 2014. https://kar.kent.ac.uk/38319/.
Full textSmith, Caitlin Caryl Danielle. "Giraffa camelopardalis: limb bone histology through ontogeny." Master's thesis, Faculty of Science, 2020. http://hdl.handle.net/11427/32351.
Full textRomero, Rodney Gray. "The histology of bone and its piezoelectric characteristics." Thesis, Kingston University, 1986. http://eprints.kingston.ac.uk/20508/.
Full textSong, Tzu-Hsi. "Algorithms for the analysis of bone marrow cancer histology images." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/101575/.
Full textSchorr, Fabíola. "Colapsabilidade da faringe durante o sono induzido: comparação entre descendentes de Japoneses e indivíduos Brancos." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/5/5150/tde-06082015-143937/.
Full textIntroduction: Obstructive sleep apnea (OSA) pathogenesis is complex and may vary according to ethnicity. The anatomical component predisposing to OSA is the result of the interaction between bony structure and upper airway soft tissues and can be assessed using passive critical closing pressure (Pcrit). We hypothesized that Japanese-Brazilians and Caucasians present different predictors to upper airway collapsibility, suggesting different causal pathways to develop OSA in these two groups. Methods: Male Japanese-Brazilians (n=39) and Caucasians (n=39) well matched for age and OSA severity were evaluated by full polysomnography, Pcrit and upper airway plus abdomen CT scans for determination of upper airway anatomy and abdominal fat, respectively. Results: Pcrit was similar between Japanese-Brazilians and Caucasians (-1.0 ± 3.3 vs -0.4 ± 3.1 cmH20). Japanese-Brazilians presented smaller upper airway bony dimensions (cranial base, maxillary and mandibular length) while Caucasians presented larger upper airway soft tissue (tongue length and volume) and greater imbalance between tongue and mandible (tongue/mandibular volume ratio). Cranial base angle was associated with Pcrit only among Japanese-Brazilians (r=-0.535, p < 0.01). Tongue/mandibular volume ratio was associated with Pcrit only among Caucasians (r=0.460, p < 0.01). Obesity-related variables (visceral fat, BMI, neck and waist circumferences) showed similar correlation with Pcrit in Japanese-Brazilians and Caucasians. Conclusions: Japanese-Brazilians and Caucasians present different predictors of upper airway collapsibility. While craniofacial bony restriction was determinant to Pcrit only in the Japanese-Brazilians, anatomical imbalance between tongue and mandible volume was important to Pcrit among Caucasians. These findings may have therapeutic implications regarding how to improve anatomical predisposition to OSA across ethnicities
Ribeiro, Fernando Salimon [UNESP]. "Utilização de enxerto de tecido conjuntivo no tratamento de lesões periodontais infra-ósseas proximais: avaliação clínica, radiográfica e histomorfométrica." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/104752.
Full textFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Este trabalho tem como objetivo avaliar a eficácia do uso de enxerto de tecido conjuntivo comparativamente a regeneração tecidual guiada, no tratamento de defeitos infra-ósseos. Para tanto, foram realizados dois estudos. No Estudo 1, defeitos infra-ósseos bilaterais foram criados na mesial dos caninos superiores de cinco cães, que após o período de cronificação (seis semanas), foram raspados e alisados. Duas semanas depois, as lesões foram aleatoriamente tratadas com enxerto de tecido conjuntivo (grupo ETC) ou membrana reabsorvível (grupo RTG). Dados clínicos foram colhidos previamente à cirurgia e 12 semanas após. Neste último período, os animais foram mortos, e procedeu-se à confecção das lâminas histológicas. Na análise dos resultados não foram detectadas diferenças estatisticamente significantes entre os grupos, porém, em ambos os grupos contatou-se redução da profundidade de sondagem (p=0,032). A análise histológica revelou menor extensão de novo cemento (p=0,001), de novo osso (p=0,003), e da extensão total de tecido conjuntivo (p=0,013) no grupo ETC em comparação com o RTG. Para o Estudo 2 foram selecionados 12 pacientes com defeitos infra-ósseos bilaterais, de duas ou três paredes, que após tratamento básico periodontal foram indicados para terapia cirúrgica no modelo de boca-dividida. Aleatoriamente, os defeitos periodontais foram designados a fazer parte do grupo ETC ou RTG. Avaliações clínicas e tomadas radiográficas foram realizadas previamente à cirurgia, seis e 12 meses pós-operatórios. Diferenças estatisticamente significantes não foram detectadas entre os grupos, porém, em ambos observou-se redução da PS (p=0,000), e aumento de recessão (p=0,002). Apenas o grupo RTG apresentou ganho de inserção (p=0,004).
This research aims to evaluate the effectiveness of the use of connective tissue graft comparatively to the guided tissue regeneration, in the treatment of infrabony defects. Hence, two studies were developed. In Study 1, bilateral infrabony defects were created in the mesial aspect of the superior canines of five dogs. After six weeks of chronification, the defects were scaled and planned. Two weeks after, the lesions were randomly treated with connective tissue graft (CTG group) or with reabsorbable membrane (GTR group). Clinical data were recorded previously and 12 weeks after surgery. In this last period, the animals were killed, and histological slides were prepared. Clinical analysis did not reveal statistically significant differences between groups, however, both groups presented reduction of the probing depth (PD) (p=0.032). Histological analysis revealed lower extension of new cement (p=0.001), new bone (p=0.003), and total connective tissue (p=0.013) in CTG group when compared to GTR groups. In Study 2, 12 patients were selected with bilateral infrabony defects, with two or three walls, which after basic periodontal treatment were referred to surgical therapy as a split-mouth design. Randomly, the defects were designed to be part of the CTG or GTR group. Clinical analysis and radiographies were performed previously, six and 12 weeks post-surgery. Statistically significant differences were not detected between groups, but both groups presented reduction of PD (p=0.000), and increase of recession (p=0.002). Gain of attachment occurred only in GTR group (p=0.004). Within the limits of the present study, it can be concluded that connective tissue graft was not efficient in the treatment of infrabony lesions with two and three walls.
Ribeiro, Fernando Salimon. "Utilização de enxerto de tecido conjuntivo no tratamento de lesões periodontais infra-ósseas proximais : avaliação clínica, radiográfica e histomorfométrica /." Araraquara : [s.n.], 2008. http://hdl.handle.net/11449/104752.
Full textBanca: Raphael Carlos Comelli Lia
Banca: Marcio Fernando de Moraes Grisi
Banca: Valdir Gouveia Garcia
Banca: Patricia Helena Rodrigues de Souza
Resumo: Este trabalho tem como objetivo avaliar a eficácia do uso de enxerto de tecido conjuntivo comparativamente a regeneração tecidual guiada, no tratamento de defeitos infra-ósseos. Para tanto, foram realizados dois estudos. No Estudo 1, defeitos infra-ósseos bilaterais foram criados na mesial dos caninos superiores de cinco cães, que após o período de cronificação (seis semanas), foram raspados e alisados. Duas semanas depois, as lesões foram aleatoriamente tratadas com enxerto de tecido conjuntivo (grupo ETC) ou membrana reabsorvível (grupo RTG). Dados clínicos foram colhidos previamente à cirurgia e 12 semanas após. Neste último período, os animais foram mortos, e procedeu-se à confecção das lâminas histológicas. Na análise dos resultados não foram detectadas diferenças estatisticamente significantes entre os grupos, porém, em ambos os grupos contatou-se redução da profundidade de sondagem (p=0,032). A análise histológica revelou menor extensão de novo cemento (p=0,001), de novo osso (p=0,003), e da extensão total de tecido conjuntivo (p=0,013) no grupo ETC em comparação com o RTG. Para o Estudo 2 foram selecionados 12 pacientes com defeitos infra-ósseos bilaterais, de duas ou três paredes, que após tratamento básico periodontal foram indicados para terapia cirúrgica no modelo de boca-dividida. Aleatoriamente, os defeitos periodontais foram designados a fazer parte do grupo ETC ou RTG. Avaliações clínicas e tomadas radiográficas foram realizadas previamente à cirurgia, seis e 12 meses pós-operatórios. Diferenças estatisticamente significantes não foram detectadas entre os grupos, porém, em ambos observou-se redução da PS (p=0,000), e aumento de recessão (p=0,002). Apenas o grupo RTG apresentou ganho de inserção (p=0,004).
Abstract: This research aims to evaluate the effectiveness of the use of connective tissue graft comparatively to the guided tissue regeneration, in the treatment of infrabony defects. Hence, two studies were developed. In Study 1, bilateral infrabony defects were created in the mesial aspect of the superior canines of five dogs. After six weeks of chronification, the defects were scaled and planned. Two weeks after, the lesions were randomly treated with connective tissue graft (CTG group) or with reabsorbable membrane (GTR group). Clinical data were recorded previously and 12 weeks after surgery. In this last period, the animals were killed, and histological slides were prepared. Clinical analysis did not reveal statistically significant differences between groups, however, both groups presented reduction of the probing depth (PD) (p=0.032). Histological analysis revealed lower extension of new cement (p=0.001), new bone (p=0.003), and total connective tissue (p=0.013) in CTG group when compared to GTR groups. In Study 2, 12 patients were selected with bilateral infrabony defects, with two or three walls, which after basic periodontal treatment were referred to surgical therapy as a split-mouth design. Randomly, the defects were designed to be part of the CTG or GTR group. Clinical analysis and radiographies were performed previously, six and 12 weeks post-surgery. Statistically significant differences were not detected between groups, but both groups presented reduction of PD (p=0.000), and increase of recession (p=0.002). Gain of attachment occurred only in GTR group (p=0.004). Within the limits of the present study, it can be concluded that connective tissue graft was not efficient in the treatment of infrabony lesions with two and three walls.
Doutor
Sviland, Lisbet. "Histology and immunopathology of skin and rectum following bone marrow transplantation." Thesis, University of Newcastle Upon Tyne, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235533.
Full textMarín, Moratalla Miren Nekane. "Reconstructing life history traits from bone histology in extant and fossil ruminants." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/285623.
Full textBone histology is a widely used tool to reconstruct vertebrate life histories, either by analysing primary bone tissue or by counting the number of growth marks (skeletochronology). However, it has long been considered that endotherms, unlike ectotherms, display a continuous or noncyclical bone growth, disabling bone histology for life history inferences in mammals. The general purpose of the research presented in this PhD Thesis is to challenge this statement, contributing to the foundations of mammalian bone histology as a tool for inferences on life history strategies. A sample of 274 bone cross-sections from 225 individuals belonging to extant dormice (Gliridae) and extant and fossil ruminants (Bovidae, Cervidae, Moschidae and Tragulidae) have been analysed under polarized and transmitted light microscopy. The results show that Lines of Arrested Growth (LAGs) are universally present in both mammalian groups analysed in this work. These growth marks are present throughout both, the fast-growing bone tissue deposited during growing period (fibrolamellar bone, FLC or parallel fibered bone, PFB) as well as the slow-growing dense lamellar tissue deposited during the adulthood (External Fundamental System, EFS). The number of rest lines in cortical bones fits well with chronological age of the animals, providing evidence of the annual periodicity of bone growth marks in these mammals. The femur is clearly the most reliable bone for skeletochronology analyses because it records the greatest number of LAGs. Despite this, bone remodelling and resorption can potentially delete or obscure the earliest ontogenetic record, especially in large ruminants. This research further indicates that bone growth is arrested during the energetically challenging period (low resource supply), coupled with physiological seasonal variation. These findings provide support that growth arrest forms part of a thermometabolic strategy for energy conservation. Moreover, this work shows that vascular and cellular features of primary bone tissue undergo strong ontogenetic variation associated with a decrease on growth rate as maturity approaches in mammals. Specifically, vascular and cellular densities decrease whereas the proportion of longitudinal canals in relation to circular ones increases throughout ontogeny until reach maturity, which may be related to physiological maturity. However, the most significant change along ontogeny occurs during the transition between the main primary tissues, from FLC/PFB to EFS, which is related to reproductive maturity. This work provides evidence that this transition reliable records the trade-off between growth and reproduction in ruminants. According to these findings, the age at reproductive maturity can be determined by counting the number of growth cycles within the fast growing tissue before the EFS. The result of comparing histological quantitative features between bovids suggests that vascular and cellular parameters are related to body mass and metabolism rather than to extrinsic factors, such as climate. Accordingly, the FLC bone of larger bovids tends to show more circular canals canals (which may reflect higher rates of periosteal bone deposition) and lower cellular densities (which may reflect lower mass-specific metabolic rate according to Kleiber’s law) than the smaller ones. Finally, the findings on fossil species provide evidence that bone histology is a valuable tool to explore evolutionary trends in mammalian life histories. Moreover, the results of bone histology to get some life history traits in endangered mammals highlight its usefulness on the field of conservation biology. To conclude, the findings of this work provide evidence that, in mammals, bone growth is mainly regulated by endogenous rates and synchronized with seasonal resource availability. The evidence of cyclical bone growth debunks the classical assumption that homeothermic endotherms grow continuously until they attain maturity, providing a clear support to the usefulness of bone histology to reconstruct life history traits in extinct and extant mammals.
Gardner, Rhodri Vaughan. "Bone diagenesis : taphonomy in archaeological bone and its relationship with the survival of ancient DNA." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322528.
Full textSOUSA, FILHO Gilberto Cunha de. "Efeito da utilização do biopolímero da cana-de-açúcar na regeneração alveolar de incisivos de coelhos." Universidade Federal de Pernambuco, 2014. https://repositorio.ufpe.br/handle/123456789/16246.
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O biopolímero da cana-de-açúcar é um produto extraído da síntese bacteriana através da Zoogloea sp., a partir do melaço de cana-de-açúcar, que apresenta características cicatrizantes em feridas cutâneas, porém nada tem sido descrito na reparação alveolar pós-cirúrgica em procedimentos que envolvem exodontias. Este trabalho se propõe a avaliar a ação deste biopolímero individualmente e associado à hidroxiapatita na reparação óssea alveolar por meio da determinação da radiopacidade e pela análise histomorfométrica, descrevendo um protocolo cirúrgico para exodontias em coelhos. Para tal, foram utilizados 30 coelhos da raça Nova Zelândia distribuídos em três grupos : Grupo I (n=10) tratado com biopolímero da cana-de-açúcar após exodontia; Grupo II (n=10) tratado com biopolímero da cana-de-açúcar associado à hidroxiapatita após a exodontia e Grupo III (n=10), grupo controle, com realização de exodontia e sem tratamento. O período de avaliação foi de 60 dias após a cirurgia, sendo realizado análise da radiopacidade feita através de radiografias digitais e estudo histomorfométrico da espessura das tábuas ósseas superior, inferior e da região central do alvéolo .As análises da radiopacidade e histomorfométrica não demonstraram diferenças significativas entre os grupos.Pôde-se ver que o uso da técnica proposta foi favorável em todos os procedimentos cirúrgicos, devido à metodologia desde a execução das manobras cirúrgicas à inserção de substâncias, sem causar alterações nos tecidos, que poderiam promover alterações no período de cicatrização. O biopolímero da cana-de-açúcar mostrou-se biocompatível, porém, não promoveu fechamento total da loja cirúrgica, onde o trabeculado ósseo circunscreveu os limites da esponja, não ocorrendo ossificação no seu interior. Porém, constatou-se que havia formação inicial de espículas ósseas no interior da esponja quando impregnada com hidroxiapatita. Assim, este biopolímero não impede a reparação óssea, porém a ação como veículo na reparação ocorre somente quando associado a outros materiais osteocondutores.
The biopolymer of cane sugar is a product extracted from bacterial synthesis by Zoogloea sp., however nothing has been described in alveolar post-surgical procedures that involved dental extractions. This study aims to evaluate the action of this biopolymer taken individually and in combination with hydroxyapatite on alveolar bone repair by determination of radiopacity and by histomorphometric analysis, describing a surgical protocol of dental extractions in rabbits. In this research were used 30 rabbits (Oryctolagus cuniculus) of New Zealand race, with an average weight of 3.0 kg, distributed in three experimental groups, i.e. Group I (n = 10) with the lower right incisor dental extraction and treated with biopolymer of cane sugar, Group II (n = 10) with the lower right incisor dental extraction and treated with biopolymer of cane sugar, associated with hydroxyapatite and Group III (n = 10), the control group, with the lower right incisor dental extraction with just achievement of suture. The trial period was 60 days after surgery, with the analysis of radiopacity made using digital x-rays and histomorphometric study of the thickness of the bone plates of upper, lower and central alveolus region, using the average value of the pixels in the images. The removal of the rabbit's incisor tooth required special care, because it was bent on the entire length of its alveolus, therefore, it was necessary for the extraction to be done in an upward curvilinear movement during the seizure of the dental crown by forceps, allowing the tooth to be avulsed without complications of fracture at its root, with use of forceps and elevators adapted for this purpose. In the analysis of the radiographic data the average values of the pixel of 128.8, 128.1 and 124.0 for Groups I, II and III respectively were observed, and no significant differences between the same were displayed. Histomorphometric bone formation showed no statistically significant difference between the groups, with the highest average in Group III, and the lowest in Group I. It could be seen that the use of the technique proposed was favourable in all surgical procedures, due to methodology since the implementation of the surgical insertion maneuvers in insertion of substances, without causing changes in tissues, which could promote changes in the healing period. The biopolymer from cane sugar has proven biocompatible, however, it did not promote total closure of surgical cavity, where the trabecular bone circumscribed the limits of sponge, with no ossification occurring therein. However, it was noted that there was initial formation of bone spicules within the sponge when impregnated with hydroxyapatite. Therefore, this biopolymer does not prevent the bone repair, however it acts as a repair vehicle only when combined with other osteoconductive materials.
Vasconcelos, Karla de Faria 1983. "Análise microestrutural de sítios ósseos implantares da maxila reconstruídos com enxerto autógeno e xenógeno = Micro-computed tomography of maxillary implant sites reconstructed with autogenous and xenogenous bone graft." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288877.
Full textTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O conhecimento da microarquitetura óssea desempenha importante papel no sucesso das reconstruções ósseas e posterior reabilitação com implantes dentários. Os objetivos dessa pesquisa foram: 1. Avaliar a microarquitetura óssea de sítios da maxila, que foram reconstruídos com enxertos ósseos, autógeno e xenógeno e 2. Avaliar tridimensional e bidimensionalmente a formação óssea na superfície dos parafusos de fixação (BIC-Bone-to-implant contact). Doze amostras contendo parafusos de fixação recobertos por 0,5 a 1mm de osso humano foram removidas com auxílio de uma broca trefina, após seis meses da colocação de blocos de enxerto em maxila de 8 pacientes, cinco mulheres e três homens, com média de idade entre 50 anos. Sete de sítios xenógenos e cinco de autógenos. As amostras foram avaliadas por meio de imagens obtidas pelo microtomógrafo SkyScan 1173 e por meio da técnica histológica de Stevenels blue e Van Giesen red. Para caracterizar a microarquitetura foram avaliados: a razão volume ósseo/volume tecidual, espessura das trabéculas, distância trabecular, número de trabéculas e densidade de conectividade, em três áreas distintas (enxerto/transição/osso nativo). O cálculo do BIC 2D foi realizado em imagens histológicas e microtomográficas. O BIC 3D foi viabilizado em áreas selecionadas em 17 amostras, entretanto, apenas em imagens adquiridas por microtomografia. Quando os parâmetros da microarquitetura foram comparados entre as áreas, foram observadas diferenças estatísticas (p<0,05) na espessura e distância das trabéculas, entre a área de osso nativo e do enxerto, apenas nas amostras autógenas. As amostras xenógenas não apresentaram diferenças entre as áreas. Quando os dois tipos de enxerto foram comparados entre si, diferenças estatísticas (p<0,05) foram encontradas entre o volume de tecido ósseo, espessura entre as trabéculas e a distância entre as trabéculas. O cálculo do BIC 2D revelou semelhança entre as técnicas (p=0,802) e também entre os tipos de enxerto (p=0,097). Avaliando os valores do BIC 3D, observou-se diferença estatística significante nos valores do BIC entre as diferentes áreas, osso e enxerto, com valores mais altos nas áreas de osso nativo. Esses dados estruturais e observações obtidas a partir de imagens microtomográficas proporcionam valiosa caracterização desses sítios e oportunidade de futuras correlações com estudos de elementos finitos e resultados clínicos
Abstract: The knowledge of bone microarchitecture is an important role in the success of bone reconstructions and following rehabilitation with dental implants. Thus, the main objectives of this study were: 1) To characterize the microarchitecture of implant bone sites reconstructed with bone grafts and 2) To assess in two and three-dimensions the percentage of bone in contact with bone graft fixing screws (BIC-Bone-implant contact). Six months after graft placement of blocks in the maxilla of eight patients (five women and three men, with a mean of 50 years of age) twelve samples containing fixing screws covered by 0.5 to 1 mm of human bone were removed using a trephine drill. Five were from sites that had received autogenous grafts and seven from sites that had received xenogeneic grafts. Samples were evaluated by micro tomography images obtained by the SkyScan 1173 (Bruker, Kontich, Belgium) device and by histological technique with Stevenels blue e Van Giesen red solutions. To characterize the bone microarchitecture, bone volume, trabecular thickness, trabecular distance, trabecular number and connectivity in three distinct areas (graft / transition / native bone) were evaluated. The 2D BIC was performed in histological and microtomography images. The 3D BIC was performed only in images acquired by microtomography in whole sample. When the microtomography bone parameters were compared between areas, statistical differences were noted only in the thickness and distance of the trabecular area between the native bone and autogenous graft (p<0.05). No statistically significant differences were observed between these areas in the xenogenous sample. When the parameters were compared between two types of grafts, statistical differences were found between the bone volume (p<0.05), the trabecular thickness (p<0.05) and trabecular separation (p<0.05).While calculating the BIC 2D revealed similarity when comparing values obtained by both techniques (p=0.802), and both grafts (p=0.097). It was observed statistically significant difference in values of BIC 3D in different areas (bone and graft) (p=0.0021) with the highest values in areas of native bone. The structural data and observations obtained from micro-computed tomography images provided valuable characterization of sites that received bone grafts and the opportunity for future correlations with finite element studies and clinical outcomes
Doutorado
Radiologia Odontologica
Doutora em Radiologia Odontológica
Selim, Mariana Baroni. "Avaliação estrutural do osso terceiro metacarpiano equino frente à implantação de biopolímero à base de mamona." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/10/10137/tde-18072014-113131/.
Full textA series of new strategies have been developed in order to optimize bone repair, because the methods currently available for human and veterinary orthopedics have no fully satisfactory results. Many researchers have dedicated to develop and study the compatibility of new implants in order to accelerate bone repair. The polymer of castor oil have drawn attention for its application as a bone substitute because it is a natural, biocompatible and have structural properties similar to bone tissue. Six horses were submited to ostectomy on the dorsal surface of its third metacarpal bone. One of the bone defects was filled with polymer of castor oil and the other remained unfilled, as a control group. The animals were followed for a period of 120 days after the procedure by monitoring radiographic bone density. After this period, a biopsy was performed for histological evaluation by light and scanning electron microscopy. The optical densitometry revealed medium values of 14.17mmAl ± 1.722 and 16.33mmAl ± 1.633 (p = 0.027) for the polymer and control groups, respectively. The light microscopy showed a higher percentage of new bone formation in the control group ( 50.15% ± 14.83 ) than in the polymer group ( 26.94 % ± 12.06 ) , with p 0.0001. However, scanning electron microscopy allowed to observe that the quality of bone formation tissue in the presence of biomaterial was maintained. Furthermore, there were no adverse reactions to biomaterial, such as scar formation or as a foreign body reaction, allowing to conclude that the polymer of castor oil can be considered suitable to fill bone defects in horses, since it demonstrated compatibility and osteoconductivity.
Ruddle, Jane Louise. "An investigation of bone histology as a potential age indicator in Roe Deer." Thesis, University College London (University of London), 1997. http://discovery.ucl.ac.uk/1317650/.
Full textRose, David C. "The Use of Geographical Information Systems Software for the Spatial Analysis of Bone Microstructure." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1304374022.
Full textRentsch, Claudia, Wolfgang Schneiders, Suzanne Manthey, Barbe Rentsch, and Stefan Rammelt. "Comprehensive histological evaluation of bone implants." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-147454.
Full textNeudert, Marcus, Christian Fischer, Burkhard Krempien, Markus J. Seibel, and Frieder Bauss. "A Rapid Histological Score for the Semiquantitative Assessment of Bone Metastases in Experimental Models of Breast Cancer." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-134931.
Full textHintergrund: Mit Hilfe eines etablierten Tiermodells zur Erzeugung lokalisationsspezifischer Knochenmetastasen in der Nacktratte wurde ein semiquantitatives histologisches Graduierungssystem zur schnellen Bewertung osteolytischer Knochenmetastasen entwickelt. Das Graduierungssystem liefert hinsichtlich der Metastasenlokalisation, deren Ausmaß und Infiltrationsmuster wertvolle Zusatzinformationen zu den konventionellen histologischen Untersuchungsmethoden. Damit kann beispielsweise auch die pharmakologische Wirkung von Bisphosphonaten auf die Knochenmetastasierung beurteilt werden. Material und Methoden: Männlichen Nacktratten (n = 12 pro Gruppe) wurden Zellen der humanen Brustkrebszellinie MDA-MB-231 in die Oberschenkelarterie inokuliert. Ab dem Auftreten radiologisch erkennbarer Osteolysen 18 Tage nach Inokulation erhielten die Tiere bis zum Studienende (Tag 30) täglich entweder eine subkutane Applikation einer Phosphat-Puffer-Lösung (Kontrollgruppe) oder Ibandronat (IBN, 10 µg P/kg; Behandlungsgruppe). Konventionelle Röntgenaufnahmen wurden an den Tagen 18 und 30 nach Tumorinokulation angefertigt und die Osteolysenflächen mittels Computerauswertung bestimmt. Nach Studienende wurde der Metastasenbefall in beiden Tibiae sowohl konventionell histologisch als auch mittels des neuen Graduierungssystems ausgewertet. Ergebnisse: Die Metastasenfläche korrelierte mit der kummulativen Punktsumme des Graduierungssystems sowohl in der Kontrollgruppe (r = 0,762; p < 0,001) als auch in der Ibandronat- Gruppe (r = 0,951; p < 0,001). Ebenso war die Osteolysenfläche eng mit der Punktesumme in beiden Gruppen korreliert (r = 0,845 und 0,854; p < 0,001). Schlussfolgerung: Die signifikante Reduktion von Knochenmark- und Kortikalisbefall durch IBN deuten auf eine gute lokale Kontrolle des Metastasenwachstums hin
Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich
Levitt, Carolyn Gale. "Bone histology and growth of chasmosaurine ceratopsid dinosaurs from the Late Campanian Kaiparowits Formation, southern Utah." Thesis, The University of Utah, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1537537.
Full textCeratopsian dinosaurs are one of the most diverse dinosaur groups in the Cretaceous, and an outstanding question is how growth strategies of this group evolved in relation to their shift from small bipedal basal ceratopsians to larger quadrupedal ceratopsids. Previous bone histology studies have investigated several basal ceratopsians and centrosaurine ceratopsids (e.g., Centrosaurus, Pachyrhinosaurus, Einiosaurus), but no chasmosaurine ceratopsids have been investigated. I conducted histological analysis of humeri, ulnae, femora, tibiae, ribs, and ossified tendons from multiple specimens of two species of chasmosaurine ceratopsid dinosaurs from the late Campanian (Upper Cretaceous) Kaiparowits Formation of southern Utah, Kosmoceratops richardsoni and Utahceratops gettyi, to examine bone microstructure indicators of growth rate and maturity. I also reexamined the long-bone histology of the ceratopsian dinosaurs Psittacosaurus mongoliensis, Protoceratops andrewsi, and Centrosaurus apertus . All elements of Utahceratops and Kosmoceratops examined are dominated by densely vascularized tissue, indicative of sustained fast growth. Radially-oriented vascular canals as well as dense osteocytes from throughout ontogeny are further indicators of rapid growth. I identified juvenile (UMNH VP 20444, UMNH VP 20454), subadult (UMNH VP 16681) and adult (UMNH VP 16860, UMNH VP 16861, UMNH VP 12198) specimens of Utahceratops, and two subadult to adult specimens (UMNH VP 17000, UMNH VP 21339) of Kosmoceratops.
I conclude that basal ceratopsians grew more slowly than the large quadrupedal ceratopsids, as evidenced by a generally higher number of definitive growth lines prevalent throughout development. In contrast, the presence of dense osteocytes, and reticular and radially-oriented vascular canals are rapid growth indicators shared by all sampled large ceratopsids, and imply an elevated metabolism for all ceratopsians. Sampled specimens of Utahceratops and Kosmoceratops do not preserve any evidence of annual lines of arrested growth (LAGs). Placed in context with the number of LAGs observed in Alaskan Pachyrhinosaurus, Centrosaurus from Alberta, and Einosaurus from Montana, these data suggest a latitudinal gradient in the number of LAGs, which suggests that bone growth is reacting to the climate.
Legendre, Lucas. "Les crocodiles sont-ils devenus secondairement ectothermes ? : étude paléohistologique." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066307/document.
Full textArchosaurs are a clade of vertebrates that includes birds, crocodiles, and numerous fossil groups. This clade has been a matter of debate among paleontologists for decades concerning the evolution of thermometabolism in its different lineages. The classical hypothesis considers that only modern birds are true endotherms, whereas all other archosaurs are ectotherms. Bone histology allows to study several traits linked to bone growth rate and thermometabolism, otherwise impossible to estimate on fossil specimens; for this reason, we used characters measured on long bone histological sections.In the first section, we extensively reviewed the measure of phylogenetic signal for osteohistological features in two clades of vertebrates, which was then used to define the methodology for building our predictive models.After a preliminary study during which we built a predictive model for bone growth rate, we built a global model to predict the metabolic rate of our fossil specimens, using both histological features and phylogenetic information for each specimen. Our results show that a majority of archosaurs in our sample were endotherms. This implies that the last common ancestor of archosaurs was likely an endotherm, and that modern crocodiles became secondarily ectothermic, probably in response to their aquatic environment. More specific studies on pseudosuchians should allow to precisely identify the level of the phylogenetic tree at which the ectothermic state was acquired, as well as adaptive constraints behind this acquisition
Bry, Régis. "Contribution à l'étude de la variabilité des propriétés mécaniques de l'os cortical diaphysaire d'un os porteur (fémur) et non-porteur (humérus)." Thesis, Valenciennes, 2015. http://www.theses.fr/2015VALE0022/document.
Full textWith the aim of enriching the virtual modelisation of human beings and understanding better the biomechanics of some parts of the skeleton, this work proposes a comparative analysis of histological and mechanical attributes of two functionally opposed appendicular bones: femur and humerus. The campaign has been done with samples coming from four embalmed PMHS (post mortem human subjects) of the male gender. A 3D geometric study started the experiment. It was followed by an histomorphometric analysis of 153 pictures carried out on the anteromedial face of the diaphyseal cortex at four levels of height and three levels of depth. Mechanical tests were then done on 28 specimens of non frozen cortical bone coming from the same anatomic site. The experiment took place on a conventional traction machine. It consisted of traction/compression tests and cycling tests under traction in the elastic zone, at the speed of 0.05 mm/mn until yield point. A damage law has also been elaborated. These studies have shown that these two bones offer a different behaviour. The humerus bone turns out to be less resistant and stiffer than the femur. It is damaged more quickly. The mechanical values noted are related to the density and the size of active osteons and also to the characteristics of Haversian porosity. The difference of mechanical behavior noticed can be explained by the microscopic adaptation of the cortical bone tissue to the stresses undergone by the bearing and non bearing bones. The inter-individual variations observed are linked to the physiological state of this tissue
Neudert, Marcus, Christian Fischer, Burkhard Krempien, Markus J. Seibel, and Frieder Bauss. "A Rapid Histological Score for the Semiquantitative Assessment of Bone Metastases in Experimental Models of Breast Cancer." Karger, 2008. https://tud.qucosa.de/id/qucosa%3A27606.
Full textHintergrund: Mit Hilfe eines etablierten Tiermodells zur Erzeugung lokalisationsspezifischer Knochenmetastasen in der Nacktratte wurde ein semiquantitatives histologisches Graduierungssystem zur schnellen Bewertung osteolytischer Knochenmetastasen entwickelt. Das Graduierungssystem liefert hinsichtlich der Metastasenlokalisation, deren Ausmaß und Infiltrationsmuster wertvolle Zusatzinformationen zu den konventionellen histologischen Untersuchungsmethoden. Damit kann beispielsweise auch die pharmakologische Wirkung von Bisphosphonaten auf die Knochenmetastasierung beurteilt werden. Material und Methoden: Männlichen Nacktratten (n = 12 pro Gruppe) wurden Zellen der humanen Brustkrebszellinie MDA-MB-231 in die Oberschenkelarterie inokuliert. Ab dem Auftreten radiologisch erkennbarer Osteolysen 18 Tage nach Inokulation erhielten die Tiere bis zum Studienende (Tag 30) täglich entweder eine subkutane Applikation einer Phosphat-Puffer-Lösung (Kontrollgruppe) oder Ibandronat (IBN, 10 µg P/kg; Behandlungsgruppe). Konventionelle Röntgenaufnahmen wurden an den Tagen 18 und 30 nach Tumorinokulation angefertigt und die Osteolysenflächen mittels Computerauswertung bestimmt. Nach Studienende wurde der Metastasenbefall in beiden Tibiae sowohl konventionell histologisch als auch mittels des neuen Graduierungssystems ausgewertet. Ergebnisse: Die Metastasenfläche korrelierte mit der kummulativen Punktsumme des Graduierungssystems sowohl in der Kontrollgruppe (r = 0,762; p < 0,001) als auch in der Ibandronat- Gruppe (r = 0,951; p < 0,001). Ebenso war die Osteolysenfläche eng mit der Punktesumme in beiden Gruppen korreliert (r = 0,845 und 0,854; p < 0,001). Schlussfolgerung: Die signifikante Reduktion von Knochenmark- und Kortikalisbefall durch IBN deuten auf eine gute lokale Kontrolle des Metastasenwachstums hin.
Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
Suedam, Ivy Kiemle Trindade [UNESP]. "Estudo comparativo dos resultados de enxertos de vidro bioativo e osso autógeno, associados ou não ao plasma rico em plaquetas, em seio maxilar de coelho: análise fractal, densitométrica e histomorfométrica." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/104740.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O objetivo do presente estudo foi avaliar o efeito da associação de osso autógeno (OA) e de vidro bioativo (VB) ao plasma rico em plaquetas (PRP) como substitutos ósseos no interior de seios maxilares (SM) de coelhos, por meio de análise radiográfica da densidade óssea e da dimensão fractal e análise histomorfométrica. Adicionalmente, pretendeu-se validar os métodos da densidade óssea e dimensão fractal como indicadores da neoformação óssea. Para tanto, 20 coelhos divididos em dois grupos (G1 e G2) foram submetidos à cirurgia de levantamento de SM. No G1, 10 SM esquerdos foram enxertados com OA e 10 SM direitos com VB. No G2, 10 SM esquerdos foram enxertados com uma combinação de OA+PRP e 10 SM direitos com VB+PRP. Após 90 dias, os animais foram sacrificados e radiografias padronizadas dos SMs foram obtidas. Os valores médios (desvio padrão) da densidade óssea, expressa em milímetros equivalentes de alumínio, para os tratamentos OA, VB, OA+PRP e VB+PRP foram, respectivamente, 1,79(0,316), 2,04(0,398), 1,61(0,285) e 1,53(0,309), sendo que diferenças estatisticamente significantes (p<0,05) foram encontradas entre os valores de VB e OA, e, VB+PRP e VB. Na dimensão fractal, os valores encontrados, que podem variar de 1 a 2, foram 1,48(0,040), 1,35(0,084), 1,44(0,043) e 1,44(0,066), respectivamente. Diferenças significantes (p<0,05) foram encontradas entre os valores de VB e OA, e, OA+PRP e VB. Na histometria, expressa em porcentagem de preenchimento ósseo, os valores obtidos foram 63,30l8,609, 52,65(10,415), 55,25(7,018) e 51,07(10,255), respectivamente. Não foram encontradas diferenças estatísticas entre os tratamentos. Não houve correlação estatisticamente significante entre as variáveis densidade óssea, dimensão fractal e porcentagem de osso. Na análise histológica dos SM tratados com OA observou-se tecido ósseo neoformado, ricamente...
The objective of the present study was to evaluate the use of autogenous bone (AB) and bioactive glass (BG) and the association of these materials with platelet-rich plasma (PRP), as bone substitutes in the rabbit maxillary sinus (MS) by means of radiographical bone density and fractal dimension and by histomorphometrical analysis. In addition, the study aimed at validating the two radiographic methods as indicators of bone formation. Twenty rabbits divided into two groups (G1 and G2) were submitted to sinus lift surgery. In G1, 10 left MS were grafted with AB and 10 right MS were grafted with BG. In G2, 10 left MS were grafted with AB+PRP and 10 right MS were grafted with VB+PRP. Ninety days after, the animals were sacrificed and standardized radiographs were taken. Mean values (standard deviation) of bone density, expressed as aluminium equivalent milimeters, in MS grafted with OA, VB, OA+PRP and VB+PRP were 1,79l0,316, 2,04l0,398, 1,61l0,285 and 1,53l0,309, respectively. Statistically significant differences (p <0,05) were observed in bone density between BG and AB, and between BG+PRP and BG. Mean values of fractal dimension, which can vary from 1 to 2, were 1,48l0,040, 1,35l0,084, 1,44l0,043 and 1,44l0,066, respectively. Significant differences were observed between BG and AB and AB+PRP and BG. Mean values of percentage of bone inside MS, assessed by histometrical analysis were, respectively, 63,30l8,609, 52,65l10,415, 55,25l7,018 and 51,07l10,255. Differences were not statistically significant. No correlations were observed among bone density, fractal dimension and percentage of bone. Histological analysis showed that MS treated with AB presented newly formed and mature lamellar bone, with active bone formation presenting several vessels and osteoblasts. The other groups showed minor bone formation, with a diffuse marrow and thin network of newly... (Complete abstract click electronic access below)
Suedam, Ivy Kiemle Trindade. "Estudo comparativo dos resultados de enxertos de vidro bioativo e osso autógeno, associados ou não ao plasma rico em plaquetas, em seio maxilar de coelho : análise fractal, densitométrica e histomorfométrica /." Araraquara : [s.n.], 2007. http://hdl.handle.net/11449/104740.
Full textAbstract: The objective of the present study was to evaluate the use of autogenous bone (AB) and bioactive glass (BG) and the association of these materials with platelet-rich plasma (PRP), as bone substitutes in the rabbit maxillary sinus (MS) by means of radiographical bone density and fractal dimension and by histomorphometrical analysis. In addition, the study aimed at validating the two radiographic methods as indicators of bone formation. Twenty rabbits divided into two groups (G1 and G2) were submitted to sinus lift surgery. In G1, 10 left MS were grafted with AB and 10 right MS were grafted with BG. In G2, 10 left MS were grafted with AB+PRP and 10 right MS were grafted with VB+PRP. Ninety days after, the animals were sacrificed and standardized radiographs were taken. Mean values (standard deviation) of bone density, expressed as aluminium equivalent milimeters, in MS grafted with OA, VB, OA+PRP and VB+PRP were 1,79l0,316, 2,04l0,398, 1,61l0,285 and 1,53l0,309, respectively. Statistically significant differences (p <0,05) were observed in bone density between BG and AB, and between BG+PRP and BG. Mean values of fractal dimension, which can vary from 1 to 2, were 1,48l0,040, 1,35l0,084, 1,44l0,043 and 1,44l0,066, respectively. Significant differences were observed between BG and AB and AB+PRP and BG. Mean values of percentage of bone inside MS, assessed by histometrical analysis were, respectively, 63,30l8,609, 52,65l10,415, 55,25l7,018 and 51,07l10,255. Differences were not statistically significant. No correlations were observed among bone density, fractal dimension and percentage of bone. Histological analysis showed that MS treated with AB presented newly formed and mature lamellar bone, with active bone formation presenting several vessels and osteoblasts. The other groups showed minor bone formation, with a diffuse marrow and thin network of newly... (Complete abstract click electronic access below)
Orientador: Gulnara Scaf
Coorientador: Elcio Marcantonio Junior
Banca: Maria Lúcia Rubo de Rezende
Banca: Eduardo Sant'Ana
Banca: Eduardo Hochuli Vieira
Banca: Joni Augusto Cirelli
Doutor
Xynos, Ioannis D. "Bioactive glasses for the in vitro synthesis of bone tissue." Thesis, Imperial College London, 2001. http://hdl.handle.net/10044/1/11494.
Full textGerwitz, Andrew. "Evaluating potential growth strategies using bone histology in Pleistocene-Holocene Odocoileus virginianus (Mammalia) from Florida." Kent State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=kent1470322817.
Full textGoldsmith, Erika. "Bone Histology and Geochemical Taphonomy of Arctic Centrosaurine Ceratopsids from the Kikak-Tegoseak Quarry (North Slope, Alaska)." Master's thesis, Temple University Libraries, 2018. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/515503.
Full textM.S.
Pachyrhinosaurus perotorum, a paleo-Arctic centrosaurine ceratopsid from the Kikak-Tegoseak Quarry (North Slope, Alaska) represents a unique opportunity to add to the understanding of ceratopsian bone histology, which is poorly understood due to the minimal preservation of growth markers (e.g. lines of arrested growth) and limited histological sampling across the ceratopsian lineage. Histological analyses of eight rib fragments from P. perotorum were conducted to add to the understanding of ceratopsian growth dynamics. Cyclical growth is preserved within ribs from P. perotorum allowing for the assignment of relative ontogenetic ages. One juvenile (DMNH 23891), 4 sub-adults (DMNH 21574, DMNH 24384, DMNH 24228, and DMNH 23888), and one adult (DMNH 24237) were identified. Radial and reticular fibrolamellar bone is prevalent in juvenile and sub-adult individuals indicating P. perotorum grew rapidly during ontogeny. Dense secondary bone is widespread in adult and three sub-adult individuals, which obscures most primary bone tissue and lines of arrested growth (LAGs). The degree of remodeling is higher than that previously reported in dinosaur rib histology, and may be attributable to differences in element-specific growth rate, environmental or biomechanical stresses. However, more histological studies of P. perotorum comparing growth between different postcranial long bones are needed to constrain the controls of secondary bone within this paleo-Arctic species. Although previous studies have interpreted taphonomy of the Kikak-Tegoseak Quarry (KTQ) using sedimentological and paleontological data, less is known about the geochemical taphonomy of this assemblage. P. perotorum bone has been altered from carbonate-hydroxyapatite to carbonate fluorapatite. XRD full width half maximum (FWHM) values display narrower peak widths (0.29-0.35°) than modern bone indicating a more crystalline apatite lattice structure. ATR-FTIR infrared splitting factor (IR-SF) values in P. perotorum specimens are greater (3.3-3.6) than in modern bone indicating that apatite crystallite sizes are larger than what is typically found in non-fossil bone. Higher crystallinity is a common result in fossil bone due the growth of authigenic apatite. ATR-FTIR spectra reveal elevated carbonate due to the addition of B-type carbonate into the apatite lattice. Relative amounts of carbonate correlates with ontogeny which could reflect a biological signal, although the effect of diagenetic alteration cannot be ruled out. Based on the elevated carbonate within bones of P. perotorum, there is potentially significant diagenetic alteration of the δ18Ocarbonate signal, therefore future stable isotope studies from the KTQ P. perotorum specimens should be cautious. Determining the potential chemical alteration of the δ18Ophosphate is more difficult since crystallinity data cannot differentiate between biogenic and secondary phosphate in bone. However, depleted carbonate: phosphate ratios can indicate the addition of more phosphate and thus, potential diagenetic alteration of the δ18Ophosphate. REE spider patterns yield different patterns between P. perotorum bones, which indicates taphonomic reworking (spatial and/or temporal) due to the preservation of different redox conditions and diffusion periods between bones. This observation is surprising due to the lack of significant/variable bone weathering or abrasion.
Temple University--Theses
Lorenz, Brock. "Healos® versus Regenaform® in guided bone regeneration : a case series with histology and computed tomography." Thesis, NSUWorks, 2013. https://nsuworks.nova.edu/hpd_cdm_stuetd/21.
Full textAnné, Jennifer. "HISTOLOGICAL AND GEOCHEMICAL PROPERTIES OF PATHOLOGICAL VERSUS NORMAL BONE IN ALLOSAURUS FRAGILIS AND MODERN AVIANS." Master's thesis, Temple University Libraries, 2010. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/103924.
Full textM.S.
In modern organisms the structure and arrangement of bone apatite crystals is dependent on the arrangement of the organic collagen fibers. This is reflected in the formation of different types of bone tissue, such as woven (immature) or lamellar (mature), in pathological versus normal bone, or fast-growing (woven) versus slow-growing (lamellar) tissue. Because the basic physiological processes of fracture healing are similar in extant vertebrates, similar patterns may exist in fossil taxa. The three questions of interest for this study were the following: 1) Do differences exist in modern bone apatite crystallinity between normal and pathologic bone? 2) Are differences between normal and pathologic tissue consistent in both modern and fossil bone? 3) Does the type of bone tissue affect fossilization? In this study, we use histological and x-ray diffraction (XRD) analyses to examine fracture pathologies in pedal phalanges from the theropod dinosaur Allosaurus fragilis, and two modern bird species, Branta canadensis (Canada goose) and Cathartes aura (turkey vulture). Raman spectroscopy analysis was performed on modern birds, but not fossil material. Stable isotope and rare earth elements (REE) analyses were performed on fossil material to determine if there are differences in how pathologic bone fossilizes compared to normal bone. Results from Raman spectroscopy and XRD confirm that pathologic bone is more crystalline than normal bone in both fossil and modern taxa. Stable isotope and REE analyses do not show any difference in fossilization between pathologic and normal bone, suggesting that these techniques are more suitable for examining taphonomic rather than physiological differences.
Temple University--Theses
Bergh, Mary Sarah. "Radiographic, Computed Tomographic, And Histologic Study Of Central Tarsal Bone Fractures In Racing Greyhounds." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1211974471.
Full textHankey, David Patrick. "Characterisation of osteoblasts in culture and analysis of bone specific proteins." Thesis, Queen's University Belfast, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317508.
Full textBarallat, Sendagorta Lucía. "Histologic and radiographic evaluation of different bone grafts in ridge preservation procedures." Doctoral thesis, Universitat Internacional de Catalunya, 2016. http://hdl.handle.net/10803/392633.
Full textEl objetivo final de este proyecto de tesis doctoral era conocer mejor el comportamiento de distintos materiales de injerto en la técnica de preservación alveolar. Hay evidencia de que, después de la extracción dental, comienza un proceso de cicatrización durante el cual el coágulo sanguíneo es progresivamente reemplazado por hueso nuevo. Además, se produce una reducción en altura y anchura de la cresta alveolar, que puede a su vez dar lugar a una disponibilidad ósea limitada pudiendo comprometer la posterior colocación de implantes. Por este motivo, se ha propuesto la introducción de distintos materiales de injerto en el alveolo postextracción. La literatura científica sugiere que los procedimientos de preservación alveolar minimizan estas alteraciones dimensionales de la cresta en sentido horizontal y vertical . Desde un punto de vista histológico, múltiples estudios han evaluado la composición histológica de áreas donde previamente se había realizado una preservación alveolar para determinar la cantidad y calidad del hueso nuevo formado. Como el beneficio adicional a nivel histológico de la preservación alveolar con distintos materiales de injerto respecto a la cicatrización natural del alveolo postextracción no se conocía, realizamos una revisión sistemática para responder esta cuestión. El sulfato de calcio, la hidroxiapatita enriquecida con magnesio (MHA) y los xenoinjertos de origen porcino resultaron en un porcentaje de hueso nuevo formado significativamente mayor que las áreas control. Otros estudios que utilizaron autoinjertos, aloinjertos o biovidrios no observaron diferencias significativas entre grupos. Sin embargo, debido a la gran variabilidad de los estudios incluídos, no se pudieron sacar conclusiones definitivas. El injerto bovino desproteneizado (DBBM) y el injerto bovino desproteneizado en una matriz de colágeno (DBBM-C) han sido ampliamente utilizados en terapias regenerativas y, particularmente, en preservación alveolar aunque aún no se han analizado las posibles diferencias entre ambos materiales. Por eso se realizó un ensayo clínico randomizado a doble ciego comparando DBBM y DBBM-C en preservación alveolar. Cinco meses después de la extracción, se observó una reducción en anchura y altura de la cresta alveolar en ambos grupos de tratamiento, pero no se encontraron diferencias estadísticamente significativas entre ambos. Por otro lado, el análisis histomorfométrico demostró una composición histológica similar en áreas tratadas con DBBM y áreas tratadas con DBBM-C. De los estudios mencionados previamente, se puede concluir que no hay un consenso sobre qué material de injerto ofrece los mejores resultados en cuanto a composición histológica. Particularmente, los resultados del ensayo clínico randomizado sugieren que no existen diferencias estadísticamente significativas entre DBBM y DBBM-C en cuanto a cambios dimensionales ni en cuanto a composición histológica 5 meses después de realizar la preservación alveolar.
Catharino, Priscilla Campanatti Chibebe. "Monitoramento histológico, histomorfométrico e radiográfico da cicatrização óssea ao redor de mini-parafusos ortodônticos autoperfurantes, submetidos ou não à aplicação de carga imediata, em tíbias de coelhos." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/23/23151/tde-11092012-112054/.
Full textMini-implants are attachments for orthodontic anchorage. This study aimed to describe the initial bone healing around mini-implants sterilized by the researchers, submitted or not to application of immediate loading. Were inserted 144 self-drilling mini-implants(TOMAS®, Dentaurum, Germany) in the tibia of eighteen white rabbits. Immediate loading (50 cN) was applied to 50% of mini-implants. The animals were sacrificed at each time post-surgery: day 15, 21, 30 and 60, and two on day 0, being the control group. Digital radiographs were obtained to measure the thickness of cortical bone (ECO), adjacent to mini-implants and equidistant from them. In digital pictures from histological slides histology and histomorphometry was analyzed. Amount of bone (QO), bone-implant contact (BIC) and ECO were analyzed by paired t-test, ANOVA and coefficient of Pearson correlation. At 0 and 15 days had shear areas. After 30 days there was deposition of immature bone, which appeared mature at 60 days. QO load was greater at 15 days (p = 0.034), and increased over healing in load (p = 0.004) and unloaded groups (p <0.001). Load affected BIC, the values increased over time in groups with load (p <0.001) and unloaded (p = 0.001). ECO increased in all regions (p <0.001). ECO near the mini-implants was greater than at midpoint, except for 15 days without load (p = 0,077). It was concluded that light immediate loading did not affect bone healing around the mini-implants. Osseointegration and increased cortical bone thickness were time-dependent.
Soost, Frank. "Validierung des Knochenumbaus von Knochenersatzmaterialien in der Mund-, Kiefer- und Gesichtschirurgie." Doctoral thesis, [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962274135.
Full textSehn, Felipe Perraro. "Influência da associação de osso bovino mineral com osso alógeno fresco congelado em enxertos para levantamento de seio maxilar. Estudo clínico, histológico e histomorfométrico em humanos." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/58/58136/tde-13062014-162825/.
Full textAllograft fresh frozen bone and Bio-Oss are knows as autogenous bone materials substitutes in maxillary sinus lifting. The aim of this study was to evaluate clinical, histological and histomorphometrically the process of repair with and without the association of BBM in maxillary sinus augmentation. In this prospective, randomized, comparative case series study, 34 maxillary sinuses were augmented, which had a residual bone ridge with a maximum height of 5 mm in maxillary sinus reconstruction region at the time for surgery of maxillary sinus prior to rehabilitation by implants. Patients were divided into a) control group: seventeen (17) grafted maxillary sinuses with only allograft bone and b) test group: 17 maxillary sinuses rehabilitated with allograft bone and BBM in a 2:1 ratio. Six months after grafting, at time of implant placement, bone samples were collected using a trephine burr for histological and histomorphometrical analysis. The research data were subjected to Student\'s t test for independent samples used for comparisons between two groups, Mann - Whitney and correlation tests were applied. 29 patients with a mean age of 51.32 years (± 6.44), were divided into control group (17) and test (12), with 34 maxillary sinuses evaluated in total. There was no statistical difference between the groups regarding to age (p = 0.23) and gender (p = 0.56). Median insertion torque of the implants was 32N for the control group and 45N for the test group (p < 0.0001). Survival rate in the control group was 93.02% and 100% in the test group. Histological analysis showed, at the control group, residual allograft bone with empty osteocytic lacunae and lamellar pattern; newly formed bone with osteocytic lacunae with viable osteocytes and immature pattern; osteoblasts in close contact with osteoid matrix, forming bridges between the blocks of allograft bone and new bone formation; osteoclasts in bone remodeling surrounding areas; no evidence of inflammatory infiltrate; connective tissue; and in the test group, all the items above and bovine bone mineral. Histomorphometry: graft remaining material (p = 0.74); remaining allogenous bone (35.78% ± 06.21% control group, 19.72% ± 10:42% test group, p < 0.0001); BBM remaining in the test group (14.78% ± 8.67); newly formed bone (11.94% ± 1.71% control group, 25.79% ± 8.76% test group, p < 0.001); total bone (47.72% ± 5.6% control group, 58.96% ± 8.1% test group, p < 0.001); connective tissue (52.27% ± 5.6% control group, 41.45% ± 8.4% test group, p < 0.01). Adding bovine bone mineral to allogenous bone in maxillary sinus surgery proved to be an effective technique of grafting for implant placement. It resulted in higher insertion torque, higher percentages of new bone formation and total bone, allowing installation of implants and functional loading.
Chin, Veronica Kei Len. "Avaliação histológica da reparação óssea em defeitos bicorticais no ângulo de mandíbula de ratos geneticamente hipertensos e de seus controles Wistar-Kyoto." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/23/23149/tde-21012009-145427/.
Full textArterial hypertension may affect the quality of bone repair because this disease is characterized by physiopathological vascular and bone metabolism changes. With the objective of evaluating the bone neoformation and remodeling, this study investigated the process of bone repair in spontaneously hypertensive rats (SHR) and their match controls Wistar-Kyoto (WKY). Through-in-through defects were done with trephine burs in the mandibular angle area, of 2mm diameter on the right side and 5mm diameter on the left side. The animals were divided into groups of five individuals each one and killed after 2, 3, 5, 10, 15, 30, 60 and 90 postoperative days; the mandibles were removed, fixed in 10% formalin solution, decalcified with 20% formic acid, and embedded in paraffin; the histological sections of 7m thickness were stained with hematoxylin and eosin. The images were captured with 40x magnification and the defect area was measured by the image processing program Image J version 1.4. The statistical analysis showed that there is no significant difference in the comparison of WKY and SHR strains (p = 0,884), independent of periods or sides; among periods, in the WKY strain (p = 0,101) and SHR one (p = 0,479), independent of sides; among periods by strains on the right side; and among strains by sides, left side with p = 0,466 and right side with p = 0,689, independent of periods. There is a significant difference between left and right side (p < 0,001), independent of strains and periods; between sides by strains, WKY and SHR, both with p < 0,001; among periods by strains on the left side, which WKY 15 days group showed an area smaller than WKY 60 days and SHR 10 days groups, and WKY 60 days group showed an area bigger than SHR 30 days and SHR 60 days groups. Despite the changes founded on the left side that could be attributed to the functional remodeling of the mandibular bone, there were no differences in the bone repair of 5mm and 2mm diameter defects between spontaneously hypertensive rats and their match controls Wistar-Kyoto.
Stein, Koen [Verfasser]. "Long bone histology of basalmost and derived Sauropodomorpha: the convergence of fibrolamellar bone and the evolution of giantism and nanism / Koen Stein. Mathematisch-Naturwissenschaftliche Fakultät." Bonn : Universitäts- und Landesbibliothek Bonn, 2011. http://d-nb.info/1018829806/34.
Full textSaxena, Anita. "Histological techniques for estimating age at death from human bone : an Indian case study." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363129.
Full textBerteau, Jean-Philippe. "Caractérisation multimodale des propriétés biomécaniques de l'os cortical de l'enfant au cours de la croissance." Thesis, Aix-Marseille 2, 2011. http://www.theses.fr/2011AIX22120.
Full textHuman bone is the result of a multiscale maturation process determined by several factors. Concerning the bone growth, few quantitative data are available in literature and their validity is questionable. A multimodal method (acoustical, mechanical, histological, biochemical and using imagery) characterizing the bone matrix leads to quantify the differences between adult and children based on clinical observations. The goal of this study is to quantify the biomechanical properties of cortical bone during growth by using a multimodal method. Several kinds of samples have been characterized, on one hand from long bone (fibula) and on the other hand from flat bone (extracted from the scoliotic rib hump). Original results have been found with law linking multiscale data. These results weak the hypothesis of bone demineralization in idiopathic adolescent scoliosis and provide new data concerning cortical bone during growth process
Afzal, Faiza. "The role of nitric oxide in the control of osteoblast metabolism and maintenance of bone integrity." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271576.
Full textMaggiano, Corey Michael. "Histomorphometry of Humeral Primary Bone: Evaluating the Endosteal Lamellar Pocket as an Indicator of Modeling Drift in Archaeological and Modern Skeletal Samples." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338414475.
Full textFlorencio-Silva, Rinaldo [UNIFESP]. "Efeitos das isoflavonas da soja associadas à vibração mecânica de baixa intensidade no tecido ósseo de ratas osteopênicas." Universidade Federal de São Paulo (UNIFESP), 2011. http://repositorio.unifesp.br/handle/11600/9410.
Full textIntrodução: É sabido que tanto as isoflavonas da soja (ISO) e a vibração mecânica de baixa intensidade e alta freqüência (VIB) possuem efeitos protetores no tecido ósseo de ratas ooforectomizadas (OVX). Objetivos: estudar os efeitos dos tratamentos com ISO e VIB isolados e combinados no tecido ósseo de ratas OVX. Métodos: 50 ratas Wistar com 6 meses de idade foram SHAM operadas ou OVX e após três meses, divididas em 5 grupos: SHAM; OVX; OVX tratadas diariamente por gavage com 200mg/kg de ISO por 90 dias consecutivos (OVX-ISO); OVX tratadas com VIB, 20 min./dia, 30 Hz, 0.6g, 5 dias por semana por 90 dias (OVX-VIB) e OVX tratadas com ISO e VIB (OVX-ISO+VIB). Após o tratamento, os fêmures e tíbias foram coletados e seus comprimento e espessura foram medidos. Os fêmures foram processados para histomorfometria e aos métodos histoquímicos, bioquímico e do TUNEL. As tíbias foram congeladas e destinadas para testes físicos e biomecânicos. Resultados: Os tratamentos não exerceram efeitos significantes no peso corporal e nas medidas de comprimento e espessura, exceto na espessura das tíbias dos grupos OVX-ISO e OVX-ISO+VIB que foi significantemente maior comparado ao grupo SHAM. Os testes físicos mostraram que o peso imerso, a porcentagem de material orgânico e a densidade óssea foram maiores nos grupos SHAM, OVX-VIB e OVX-ISO+VIB quando comparados aos outros grupos, enquanto que o volume ósseo, a densidade mineral óssea, porc entagem de material mineral e o peso das cinzas foram maiores nos grupos OVX e OVX-ISO do que nos outros grupos e não houve diferenças significantes nos parâmetros biomecânicos analisados entre os grupos. Nos fêmures, os tratamentos não exerceram efeitos significantes no volume ósseo trabecular, porém, o tratamento combinado exerceu efeitos positivos no osso cortical. Os tratamentos tiveram efeitos positivos em relação à quantidade e na organização das fibras colágenas e esse efeito foi mais expressivo no grupo OVX-ISO+VIB. O método do TUNEL não detectou diferenças nas células TUNEL-positivas entre os grupos. Conclusão: Esses resultados demonstram que o tratamento combinado (ISO+VIB) exerce maior efeito nos constituintes do tecido ósseo de ratas ooforectomizadas osteopênicas, quando comparado aos tratamentos isolados.
Introduction: It has been shown that both soy isoflavones (ISO) and low intensity high frequency mechanical vibration (VIB) have protective effects in bone tissue of ovariectomized (OVX) rats. Objective: We investigated whether combined treatments with ISO and VIB would exhibit cooperative effects in bone tissue of OVX rats. Methods: Fifty female Wistar rats at the age of 6 months were either sham-operated or OVX. After operation, the rats were divided in five groups: SHAM; OVX; OVX treated daily by gavage with 200mg/kg/body weight of ISO for 90 days (OVX-ISO); OVX treated with VIB, 20 min./day, at 60 Hz, 0.5g, 5 days/ week for 90 days (OVX-VIB) and OVX treated with ISO and VIB (OVX-ISO+VIB). After treatment, the femurs and tibias were collected and its length and thickness were measured. The femurs were then processed for histomorphometry, histochemistry and biochemical assay. The tibias were frozen for subsequent physical and mechanical tests. Results: Treatments did not have significant effects on body weight and in the bone measurements, except in the tibial thickness of the OVX-ISO and OVX-ISO+VIB groups that was significant higher than the SHAM group. Physical tests showed that the immersed weight, content of organic material and bone density were higher in the SHAM, OVX-VIB and OVX-ISO+VIB groups than the other groups, while the bone volume, bone mineral density, mineral material and the ash weight were higher in the OVX and OVX-ISO groups than the other groups and there were no significant differences in the mechanical tests among the groups. Treatment did not have significant effects in the trabecular bone volume, but it was not detected cortical bone loss in the group treated with the combined therapy. The treatments showed positive effects in the content of glycosaminoglycans, as well as in the organization of collagen fibers and these effects was higher in the OVX-ISO+VIB group. The TUNEL-positive cell profile was similar among the groups. Conclusion: These results demonstrate that the combined treatment (ISO+VIB) have better effects in the bone tissue constituents of ovariectomized osteopenic rats, when compared with the treatments isolated.
TEDE
BV UNIFESP: Teses e dissertações
Nart, Molina José. "Estudio Prospectivo Comparativo de la Eficacia en el Aumento Horizontal de Crestas Alveolares Atróficas con Regeneración Ósea Guiada y Expansores Motorizados de Cresta." Doctoral thesis, Universitat Internacional de Catalunya, 2010. http://hdl.handle.net/10803/9340.
Full textEl propósito de esta investigación clínica prospectiva y aleatoria es comparar el aumento horizontal de la cresta alveolar obtenido con el uso de los expansores motorizados de cresta (EMC) y con regeneración ósea guiada (ROG). Fueron selecccionados ocho pacientes con deformidades horizontales del reborde alveolar bilaterales que iban a recibir implantes dentales. Una técnica de regeneración se utilizó en el lado derecho y la otra en el lado izquierdo, para un total de 23 muestras, 13 en el lado experimental (EMC) y 10 en el lado control (ROG). Los implantes fueron colocados seis meses después de los procedimientos de aumento óseo, y se obtuvo una muestra de hueso para estudio histológico. Todas las mediciones clínicas se registraron a los 2 y 5 mm de la parte más coronal de la cresta. El aumento logrado con ambas técnicas fue estadísticamente significativo, de 1,2 mm en la ROG y 1,5 mm con los EMC a 2 mm de la cresta; y 1,5 mm y 1,6 mm, respectivamente, a 5mm de la cresta. Las diferencias entre las dos técnicas no fueron estadísticamente significativas. La cantidad de expansión lograda en el sitio de los EMC parece tener una correlación negativa (p <0,05) con el grosor del hueso esponjoso, y no se ve afectada por el grosor de la cortical. Histológicamente se observó osteoconductividad del injerto óseo y más partículas residuales del mismo en el lado experimental. La técnica de los EMC parece ser tan eficaz como la técnica de ROG en el aumento de la anchura de las crestas atróficas. Los defectos tratados con los EMC mostraron una menor contracción del injerto óseo durante los 6 meses de cicatrización.
El propòsit d'aquesta recerca clínica prospectiva i aleatòria és comparar l'augment horitzontal de la cresta alveolar obtingut amb l'ús dels expansors motoritzats de cresta (EMC) i amb regeneració òssia
guiada (ROG). Es van selecccionar vuit pacients amb deformitats horitzontals bilaterals de la cresta alveolar on es col.locaren implants dentals. Una tècnica de regeneració es va emprar en el costat dret i l'altra a la banda esquerra, per a un total de 23 mostres, 13 al costat experimental (EMC) i 10 en el costat control (ROG). Els implants van ser col.locats sis mesos després dels procediments d'augment ossi, i es va obtenir una mostra d'os per estudi histològic.Totes les mesures clíniques es van registrar als 2 i 5 mm de la part més coronal de la cresta. L'augment aconseguit amb ambdues tècniques va ser estadísticament significatiu, de 1,2 mm a la ROG i 1,5 mm amb els EMC a 2 mm de la carena, i 1,5 mm i 1,6 mm, respectivament, a 5mm de la cresta. Les diferències entre les dues
tècniques no van ser estadísticament significatives. La quantitat d'expansió aconseguida en el lloc dels EMC sembla tenir una correlació negativa (p<0,05) amb el gruix de l'os esponjós, i no es veu afectada per el gruix de la cortical. Histològicament es observar osteoconductividad l'empelt ossi i més partícules residuals d'aquest en el costat experimental. La tècnica dels EMC sembla ser tan eficaç com la tècnica de ROG en l'augment de l'amplada de les crestes atròfiques. Els defectes tractats amb els EMC mostrar una menor contracció de l'empelt ossi durant els 6 mesos de cicatrització.
Pereira, Marcos Alexandre da Franca. "Descompressão dos segmentos timpânico e labiríntico do nervo facial via fossa craniana média." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/5/5143/tde-02052016-090526/.
Full textBackground: Peripheral facial palsy is characterized by the permanent or temporary interruption of the functioning of the facial muscles. The middle cranial fossa (MCF) approach has been used for the decompression of the facial nerve (FN) when hearing needs to be preserved. In this work, we describe an innovative technique for the decompression of the FN through the MCF approach that allows the direct exposure of the labyrinthine and entire tympanic segment of the FN, with the preservation of inner ear function. Methods: Twenty cadavers heads were used in this study. The reference landmarks used were the middle meningeal artery, the greater superficial petrosal nerve, the arcuate eminence, the inferior petrosal sinus and the meatal plane following the petrous apex from its most anterior and medial portion. Results: The tympanic segment of the FN presented, on average, a total length of 11 ± 0.67mm to the right, and 11.5 ± 0.60mm to the left. The longitudinal lengths of bone window in the tegmen tympani were 16.8±1.67mm to the right, and 16.8 ± 1.20mm to the left. The cross-sectional lengths of the bone window in the tegmen tympani were 5.5 ± 1.20mm and 5.0±1.75mm to the right and left sides, respectively. The average value of elliptical area formed by the longitudinal and transversal lengths of the bone window made in the tegmen tympani were 72.5 ± 22.5mm2 to the right, and 65.9 ± 30.3mm2 to the left. Conclusion: The proposed technique can be used for the surgical decompression of the tympanic, labyrinthine and meatal segments of the FN through the MCF, without imposing a risk to hearing, in addition to reducing the surgical time and the risk to patients