Contribuição ao estudo da variação de enzimas do globo ocular de cães : emprego de baixas doses de radiação e dosimetria termoluminescente

Tese (livre docencia) - Universidade Estadual de Campinas, Faculdade de Odontologia de PiracicabaResumo: Não informadoAbstract: Not informedLivre DocênciaLivre Docente em Radiologia Odontologic

Determinação das doses de radiação produzidas durante a obtenção de radiografias periapicais com o emprego da dosimetria termoluminescente

Orientador : Nivaldo GonçalvesTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de PiracicabaResumo: Não informadoAbstract: Not informedDoutoradoSemiologiaDoutor em Ciência

A contribution to the study of nominal kilovoltage preconized and time of exposure for different models of dental X-ray machines

This study intended to assess the performance of dental X-ray machines as regards time of exposure and kilovoltage with an analysis of 127 X-ray machines sold by Funk and Dabi Atlante in the South of Minas Gerais State. The values obtained, both time of exposure and kilovoltage for each model of X-ray machine studied, were organized into frequency distribution tables and presented in histograms. Results obtained, once processed, were indicative of an exposure time performance that was unsatisfactory for Funk Model X-10, whereas the Dabi Atlante machines Models Spectro II, Trophy, and Spectro 1070, proved satisfactory as to performance in a comparison of real exposure and nominal exposure times. We examined the nominal kilovoltage of these same machines and, as a whole, they showed lesser kilovoltage than that preconized, indicative of performance short of that expected. Professionals are advised of the need for periodic maintenance in order to remedy the deficiencies presented by the machines, at least in partO presente trabalho teve o propósito de avaliar o desempenho de aparelhos de raios X odontológicos com relação aos fatores "tempo de exposição" e "quilovoltagem". Foram estudados 127aparelhos da região Sul de Minas Gerais, comercializados pelas firmas Funk e Dabi Atlante. Os valores obtidos, tanto do tempo de exposição quanto da quilovoltagem para cada modelo de aparelho de raios X estudado, foram organizados em tabelas de distribuição de freqüência e apresentados em histogramas. Os resultados obtidos, após serem trabalhados, apontaram um desempenho para o tempo de exposição pouco satisfatório para o modelo X-10, da Funk, enquanto que os aparelhos da firma Dabi Atlante, modelos Spectro II, Trophy e Spectro 1070, mostraram desempenho satisfatório quando comparados o tempo de exposição real e o tempo de exposição nominal. Esses mesmos aparelhos tiveram a sua quilovoltagem nominal pesquisada e mostraram, no geral, uma quilovoltagem menor do que a preconizada, apontando com isso um desempenho aquém do esperado. Para tentar sanar, pelo menos em parte, as deficiências apresentadas pelos aparelhos, recomenda-se aos profissionais sua manutenção periódicaUSP/Faculdade de Odontologia de Bauru11114349BrasilRevista de odontologia da Universidade de São PauloRev odontol Univ São PauloThis study intended to assess the performance of dental X-ray machines as regards time of exposure and kilovoltage with an analysis of 127 X-ray machines sold by Funk and Dabi Atlante in the South of Minas Gerais State. The values obtained, both time of exposure and kilovoltage for each model of X-ray machine studied, were organized into frequency distribution tables and presented in histograms. Results obtained, once processed, were indicative of an exposure time performance that was unsatisfactory for Funk Model X-10, whereas the Dabi Atlante machines Models Spectro II, Trophy, and Spectro 1070, proved satisfactory as to performance in a comparison of real exposure and nominal exposure times. We examined the nominal kilovoltage of these same machines and, as a whole, they showed lesser kilovoltage than that preconized, indicative of performance short of that expected. Professionals are advised of the need for periodic maintenance in order to remedy the deficiencies presented by the machines, at least in partO presente trabalho teve o propósito de avaliar o desempenho de aparelhos de raios X odontológicos com relação aos fatores ©tempo de exposiçãoª e ©quilovoltagemª. Foram estudados 127aparelhos da região Sul de Minas Gerais, comercializados pelas firmas Funk e Dabi Atlante. Os valores obtidos, tanto do tempo de exposição quanto da quilovoltagem para cada modelo de aparelho de raios X estudado, foram organizados em tabelas de distribuição de freqüência e apresentados em histogramas. Os resultados obtidos, após serem trabalhados, apontaram um desempenho para o tempo de exposição pouco satisfatório para o modelo X-10, da Funk, enquanto que os aparelhos da firma Dabi Atlante, modelos Spectro II, Trophy e Spectro 1070, mostraram desempenho satisfatório quando comparados o tempo de exposição real e o tempo de exposição nominal. Esses mesmos aparelhos tiveram a sua quilovoltagem nominal pesquisada e mostraram, no geral, uma quilovoltagem menor do que a preconizada, apontando com isso um desempenho aquém do esperado. Para tentar sanar, pelo menos em parte, as deficiências apresentadas pelos aparelhos, recomenda-se aos profissionais sua manutenção periódicaSão Paulo, S

SIALOGRAPHY OF CLINICALLY NORMAL PAROTID GLANDS: ANATOMICAL CLASSIFICATION AND CORRELATION WITH GLANDULAR FUNCTION

The aim of the present study was to analyze and correlate anatomical features and the functional activity of healthy parotid glands using a sialographic technic. The anatomical study was performed in 55 subjects, from which 37 took part in the functional exam, which was to verify the elimination of the contrast substance, Lipiodol UF, in stimulated and non-stimulated glands. The results showed that the analysis of the sialographic image by the observation of the glandular duct system allowed the formation of 5 distinct anatomical groups. In the functional evaluation, stimulated glands presented more uniform and shorter periods of time to eliminate Lipiodol UF than non-stimulated. The correlation between the anatomical and functional findings was submitted to statistical treatment and the mean elimination time of the contrast substance in stimulated glands from Group I was significantly higher than that from Group II and III. The maximum time required for the emptying of stimulated glands was 5 minutes, in all groups, while non-stimulated glands did not present statistical difference between groups. Finally, it was concluded that the combined evaluation of the anatomical model and the excretory function of glands should be carried out with the use of a stimulus.O presente estudo teve por finalidade analisar e correlacionar as características anatômicas e a atividade funcional de glândulas parótidas saudáveis, empregando técnica sialográfica. O estudo anatômico foi realizado em 55 indivíduos, dos quais 37 participaram do exame funcional, que consistiu na verificação da eliminação da substância de contraste Lipiodol UF,, em glândulas estimuladas e não estimuladas. Os resultados demonstraram que a análise das imagens sialográficas pela observação do sistema de ductos glandulares permitiu a constituição de 5 grupos anatômicos distintos. Na avaliação funcional, as glândulas estimuladas levaram períodos de tempo mais uniformes e curtos para a eliminação do Lipiodol UF em relação às não estimuladas. A correlação dos achados anatômicos e funcionais mostrou que a média do tempo de eliminação da substância de contraste em glândulas estimuladas no Grupo I foi significantemente maior que as médias dos Grupos II e III; o tempo máximo para o esvaziamento de glândulas estimuladas foi de 5 minutos em todos os Grupos, enquanto que as glândulas não estimuladas não apresentaram diferença estatística entre os Grupos. Ao final, concluiu-se que a avaliação conjunta do modelo anatômico e da função excretora de glândulas deve ser realizada com a utilização de estímulo

Effect of vitamin A administration in gamma-irradiated repair tissue as revealed by polarizing microscopy

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Bond Strength Of Dental Adhesive Systems Irradiated With Ionizing Radiation.

The aim of the present paper was to determine the effect of different types of ionizing radiation on the bond strength of three different dentin adhesive systems. One hundred twenty specimens of 60 human teeth (protocol number: 032/2007) sectioned mesiodistally were divided into 3 groups according to the adhesives systems used: SB (Adper Single Bond Plus), CB (Clearfil SE Bond) and AP (Adper Prompt Self-Etch). The adhesives were applied on dentin and photo-activated using LED (Lec 1000, MMoptics, 1000 mW/cm2). Customized elastomer molds (0.5 mm thickness) with three orifices of 1.2 mm diameter were placed onto the bonding areas and filled with composite resin (Filtek Z-250), which was photo-activated for 20 s. Each group was subdivided into 4 subgroups for application of the different types of ionizing radiation: ultraviolet radiation (UV), diagnostic x-ray radiation (DX), therapeutic x-ray radiation (TX) and without irradiation (control group, CG). Microshear tests were carried out (Instron, model 4411), and afterwards the modes of failure were evaluated by optical and scanning electron microscope and classified using 5 scores: adhesive failure, mixed failures with 3 significance levels, and cohesive failure. The results of the shear bond strength test were submitted to ANOVA with Tukey's test and Dunnett's test, and the data from the failure pattern evaluation were analyzed with the Mann Whitney test (p = 0.05). No change in bond strength of CB and AP was observed after application of the different radiation types, only SB showed increase in bond strength after UV (p = 0.0267) irradiation. The UV also changed the failure patterns of SB (p = 0.0001). The radio-induced changes did not cause degradation of the restorations, which means that they can be exposed to these types of ionizing radiation without weakening the bond strength.12123-

MicroCT assessment of bone microarchitecture in implant sites reconstructed with autogenous and xenogenous grafts: a pilot study

PURPOSE: To assess bone microarchitecture in maxillary sites grafted with autogenous or xenogenous grafts as well as to demonstrate the usefulness of microCT in dental implant research. MATERIALS AND METHODS: Samples (n = 12) consisting of titanium fixation screws covered by at least 0.5-1 mm of human bone were obtained from 17 sites grafted with autogenous or xenogenous materials and prepared for microCT scanning and conventional histology. Bone histomorphometric parameters were evaluated in three distinct regions (graft region, transitional region, and native bone region). Three-dimensional (3D) bone-to-implant contact (BIC) calculation was performed using microCT data. Histological sections were used to calculate two-dimensional (2D) BIC percentages, which were compared with values obtained from 2D microCT images. RESULTS: Histomorphometric parameters varied according to the type of graft used, but sites reconstructed with autogenous bone showed higher mean values in general. In autograft samples, indices for parameters such as Tb.Th and Tb.Sp were significantly different when the native bone region was compared to the graft region. While a higher mean 3D BIC was found in the native bone region for both graft materials, significant BIC differences were absent when graft types were compared. The 2D BIC percentages obtained from histological and microCT images were similar. CONCLUSIONS: Autografts outperformed the xenogenous material used in this study concerning the histomorphometric parameters assessed. While graft type did not seem to influence 3D BIC, the native bone region showed the highest BIC percentages when compared to the other regions in both graft groups. In addition, 2D BIC ratios were similar regardless of graft material or image source (histological sections x microCT slices). Taken together, our findings suggest that microCT is an effective tool for 2D and 3D histomorphometric and BIC assessments in dental implant research.status: publishe