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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

A study of the effects of high speed rotary instruments on bone repair submitted in partial fulfillment ... oral surgery ... /

Youngblood, Philip J. January 1960 (has links)
Thesis (M.S.)--University of Michigan, 1960.
2

A study of the effects of high speed rotary instruments on bone repair submitted in partial fulfillment ... oral surgery ... /

Youngblood, Philip J. January 1960 (has links)
Thesis (M.S.)--University of Michigan, 1960.
3

Effects of kinetic cavity preparation vs. conventional handpiece preparation on the human dental pulp

Collins, Julie M. January 1998 (has links)
Indiana University-Purdue University Indianapolis (IUPUI) / The purpose of this investigation was to compare the histopathologic effects of kinetic cavity preparation to the histopathologic effects of conventional high-speed handpiece preparation on the human dental pulp. The objective was to test the following hypothesis: kinetic cavity preparation results in significantly fewer pulpal effects than does conventional preparation using the high-speed handpiece. Class V cavity preparations were made in 26 teeth of seven patients who required extraction of these teeth for orthodontic purposes. Thirteen teeth were prepared using kinetic cavity preparation, using 27-um aluminum oxide particles at 160 pounds per square inch pressure. Thirteen were prepared using the high-speed handpiece and 330bur. Glass ionomer restorations were placed in all teeth. Extractions were done 10 to 15days after preparation. On teeth with closed apices, the apical one-third of the root was removed. All teeth were placed in 10 percent formalin solution. Teeth were sectioned and selected slides stained with hematoxylin and eosin for histologic evaluation. Microscopic findings indicated that the amount of remaining dentin was of significant thickness to be protective to the pulp. Pulpal responses ranged from no response in 22 specimens to a mild response in 4 specimens. Based on the results of this study, it was concluded that shallow preparation into the dentin does not cause pulpal damage at 10 to 15 days post-preparation, when using either kinetic cavity preparation or high-speed handpiece preparation. The hypothesis that kinetic cavity preparation causes significantly fewer pulpal effects than does conventional preparation with the high-speed handpiece was rejected.
4

Desinfecção das canetas de alta rotação com álcool 70% p/v sem limpeza prévia: avaliação do risco de infecção cruzada / Disinfection of high-speed dental equipment with 70% ethanol without previous cleaning: assessment of cross-infection risk

Pinto, Flávia Morais Gomes 17 June 2013 (has links)
Introdução: Na prática clínica odontológica, justificada pela praticidade, tempo curto disponível entre os atendimentos, associados à insuficiente previsão e provisão das Canetas de Alta Rotação (CAR), a descontaminação destas por meio de aplicação direta do álcool 70% p/v, sem limpeza prévia, é uma realidade. Este procedimento contraria, a priori, os protocolos de processamento que recomendam, no mínimo, limpeza seguida de desinfecção de alto nível para prevenção de infecção cruzada. Objetivo: avaliar a desinfecção das CAR com álcool 70% p/v, sem limpeza prévia com vistas ao risco de causar infecção cruzada. Método: caracterizou-se como uma pesquisa pragmática em um Estabelecimento Odontológico, onde rotineiramente as práticas de interesse para o estudo estavam presentes. O grupo experimental foi composto por 100 amostras de CAR utilizadas em tratamentos diversos, após a fricção do desinfetante por 90 segundos em sua superfície externa. Para avaliação dos resultados, uma gaze umedecida com soro fisiológico foi utilizada como carreador para o arraste dos possíveis micro-organismos nas superfícies desinfetadas. Metade do número das amostras (50) foi analisada pelo método de filtração por membrana (Método I - quantitativo), sendo cada gaze imersa em 300 mL de solução fisiológica. Sequencialmente, as amostras foram expostas a sonicação e agitação. Em seguida, o lavado foi filtrado em três partes iguais para diferentes análises (micro-organismos aeróbios, anaeróbios e específicos da microbiota oral humana), por meio da membrana com porosidade de 0,45 m. As outras 50 amostras foram analisadas pelo método de imersão direta da gaze em meio de cultura Fluid Thioglycollate Medium (Método II qualitativo). O tubo contendo a gaze foi agitado e incubado a 37ºC por 21 dias. Resultados: as amostras analisadas pelo Método I apresentaram crescimento positivo em 27/50 (54%) das amostras na faixa de 100 a 102 UFC/amostra. Deste total, foram identificados sete micro-organismos distintos, representados por 37,1% do Staphylococcus coagulase negativa, 28,5% dos Bacillus spp, 17,1% dos Bacilo Gram positivos não esporulados, 5,7% dos Micrococcus spp, 5,7% dos Penicillium spp, 2,8% Acinetobacter baumannii e 2,8% da Candida spp. No grupo analisado pelo Método II, o total de tubos com crescimento positivo foi de 12/50 (24%) amostras. Deste total, foram identificados três micro-organismos distintos, sendo 38,4% de Bacilos Gram positivos inespecíficos, seguidos dos Staphylococcus spp e Peptococcus spp com a mesma porcentagem de positividade de 30,7% cada. O grupo controle negativo, composto por amostras submetidas à limpeza e esterilização consecutiva, apresentaram resultados satisfatórios de ausência microbiana na totalidade das amostras. O crescimento médio encontrado no grupo controle positivo foi de 17,5 UFC/placa, com exceção de uma amostra que apresentou crescimento incontável. Conclusão: os resultados da presente investigação reprovam a prática da descontaminação das CAR com álcool 70% p/v, sem limpeza prévia, substanciada pela sobrevivência de micro-organismos que não corresponderam à ação fungicida e bactericida esperada do álcool 70% p/v na condição de desinfetante de nível intermediário. Outro aspecto que reforça a reprovação da prática analisada é a consideração de que os micro-organismos recuperados, mesmo sendo de baixo potencial patogênico, podem comportar-se como anfibiontes, isto é, são capazes de agredir o hospedeiro quando as condições ambientais e imunológicas são favoráveis aos micro-organismos, causando infecção. / Introduction: In dental clinical practice, decontamination of high-speed dental equipment (HSDE) by direct use of 70% ethanol without previous cleaning, justified by practicality, the short-time available between appointments, together with inadequate predicting and provision of HSDE, is a reality. This procedure, a priori, contradicts the processing protocols recommended to prevent cross-infection. Objective: to evaluate the disinfection of HSDE with 70% ethanol without previous cleaning, with views of cross-infection risk. Method: the present study was characterized as a pragmatic research in a Dental Office, which practices of interest to the study were routinely performed. The experimental group consisted of 100 samples of HSDE used in different treatments after rubbing the disinfectant for 90 seconds on its outer surface. To evaluate the results, gauze moistened with saline solution was used as a carrier for obtaining microorganisms from the disinfected surfaces. Half of the samples (50) were analyzed by membrane filtration (Method I - quantitative), with the gauze being immersed in 300 mL of saline solution. Sequentially, the sample was exposed to sonication and agitation. After that, the lavage was filtered in three equal parts for different analyses, through a membrane with 0.45 m porosity and seeded on blood agar culture medium, for recovery of aerobic and anaerobic microorganisms, as well as those specifically found in the human oral microbiota. The other 50 samples were analyzed by direct immersion of the gauze in culture medium (Method II - Qualitative): after rubbing the wet gauze on the outer surface of the HSDE, it was placed directly in Fluid Thioglycollate culture medium. The tube containing the gauze was shaken in a vortex mixer and then incubated at 37 ° C for 21 days. Results: samples analyzed by Method I, showed positive growth in 27/50 (54%) of the samples within the range of 100 to 102 CFU/sample. Of this total, 7 different microorganisms were identified, represented by 37.1% of coagulase-negative Staphylococcus, 28.5% of Bacillus spp, 17.1% of non-sporulating Gram-positive bacillus, 5.7% of Micrococcus spp, 5.7 % of Penicillium spp, 2.8% of Acinetobacter baumannii and 2.8% of Candida spp. In the group analyzed by Method II, the total number of tubes with positive growth was 12/50 (24%) samples. Of this total, we identified 2 different microorganisms, being 38.4% of Gram-positive bacillus nonspecific, followed by Staphylococcus spp and Peptococcus spp with the same percentage of positivity of 30.7% each. The negative control group, composed of samples subjected to cleaning and sterilization consecutive showed satisfactory results. The average growth found in the positive control group was 17.5 CFU/sample, except for one sample that showed growth uncountable. Conclusion: the results of the present study do not support the practice of decontamination of HSDE with 70% ethanol without previous cleaning, based on the evidence of microorganism survival that did not meet the expected bactericidal and fungicidal action of alcohol as an intermediate level disinfectant. Another aspect that reinforces the disapproval this practice, it is the consideration that the micro-organisms recovered, even being low pathogenic potential, may behave as anfibionte, which are capable of harming the host when the environmental and immune conditions are favorable to micro-organisms, causing infection.
5

Desinfecção das canetas de alta rotação com álcool 70% p/v sem limpeza prévia: avaliação do risco de infecção cruzada / Disinfection of high-speed dental equipment with 70% ethanol without previous cleaning: assessment of cross-infection risk

Flávia Morais Gomes Pinto 17 June 2013 (has links)
Introdução: Na prática clínica odontológica, justificada pela praticidade, tempo curto disponível entre os atendimentos, associados à insuficiente previsão e provisão das Canetas de Alta Rotação (CAR), a descontaminação destas por meio de aplicação direta do álcool 70% p/v, sem limpeza prévia, é uma realidade. Este procedimento contraria, a priori, os protocolos de processamento que recomendam, no mínimo, limpeza seguida de desinfecção de alto nível para prevenção de infecção cruzada. Objetivo: avaliar a desinfecção das CAR com álcool 70% p/v, sem limpeza prévia com vistas ao risco de causar infecção cruzada. Método: caracterizou-se como uma pesquisa pragmática em um Estabelecimento Odontológico, onde rotineiramente as práticas de interesse para o estudo estavam presentes. O grupo experimental foi composto por 100 amostras de CAR utilizadas em tratamentos diversos, após a fricção do desinfetante por 90 segundos em sua superfície externa. Para avaliação dos resultados, uma gaze umedecida com soro fisiológico foi utilizada como carreador para o arraste dos possíveis micro-organismos nas superfícies desinfetadas. Metade do número das amostras (50) foi analisada pelo método de filtração por membrana (Método I - quantitativo), sendo cada gaze imersa em 300 mL de solução fisiológica. Sequencialmente, as amostras foram expostas a sonicação e agitação. Em seguida, o lavado foi filtrado em três partes iguais para diferentes análises (micro-organismos aeróbios, anaeróbios e específicos da microbiota oral humana), por meio da membrana com porosidade de 0,45 m. As outras 50 amostras foram analisadas pelo método de imersão direta da gaze em meio de cultura Fluid Thioglycollate Medium (Método II qualitativo). O tubo contendo a gaze foi agitado e incubado a 37ºC por 21 dias. Resultados: as amostras analisadas pelo Método I apresentaram crescimento positivo em 27/50 (54%) das amostras na faixa de 100 a 102 UFC/amostra. Deste total, foram identificados sete micro-organismos distintos, representados por 37,1% do Staphylococcus coagulase negativa, 28,5% dos Bacillus spp, 17,1% dos Bacilo Gram positivos não esporulados, 5,7% dos Micrococcus spp, 5,7% dos Penicillium spp, 2,8% Acinetobacter baumannii e 2,8% da Candida spp. No grupo analisado pelo Método II, o total de tubos com crescimento positivo foi de 12/50 (24%) amostras. Deste total, foram identificados três micro-organismos distintos, sendo 38,4% de Bacilos Gram positivos inespecíficos, seguidos dos Staphylococcus spp e Peptococcus spp com a mesma porcentagem de positividade de 30,7% cada. O grupo controle negativo, composto por amostras submetidas à limpeza e esterilização consecutiva, apresentaram resultados satisfatórios de ausência microbiana na totalidade das amostras. O crescimento médio encontrado no grupo controle positivo foi de 17,5 UFC/placa, com exceção de uma amostra que apresentou crescimento incontável. Conclusão: os resultados da presente investigação reprovam a prática da descontaminação das CAR com álcool 70% p/v, sem limpeza prévia, substanciada pela sobrevivência de micro-organismos que não corresponderam à ação fungicida e bactericida esperada do álcool 70% p/v na condição de desinfetante de nível intermediário. Outro aspecto que reforça a reprovação da prática analisada é a consideração de que os micro-organismos recuperados, mesmo sendo de baixo potencial patogênico, podem comportar-se como anfibiontes, isto é, são capazes de agredir o hospedeiro quando as condições ambientais e imunológicas são favoráveis aos micro-organismos, causando infecção. / Introduction: In dental clinical practice, decontamination of high-speed dental equipment (HSDE) by direct use of 70% ethanol without previous cleaning, justified by practicality, the short-time available between appointments, together with inadequate predicting and provision of HSDE, is a reality. This procedure, a priori, contradicts the processing protocols recommended to prevent cross-infection. Objective: to evaluate the disinfection of HSDE with 70% ethanol without previous cleaning, with views of cross-infection risk. Method: the present study was characterized as a pragmatic research in a Dental Office, which practices of interest to the study were routinely performed. The experimental group consisted of 100 samples of HSDE used in different treatments after rubbing the disinfectant for 90 seconds on its outer surface. To evaluate the results, gauze moistened with saline solution was used as a carrier for obtaining microorganisms from the disinfected surfaces. Half of the samples (50) were analyzed by membrane filtration (Method I - quantitative), with the gauze being immersed in 300 mL of saline solution. Sequentially, the sample was exposed to sonication and agitation. After that, the lavage was filtered in three equal parts for different analyses, through a membrane with 0.45 m porosity and seeded on blood agar culture medium, for recovery of aerobic and anaerobic microorganisms, as well as those specifically found in the human oral microbiota. The other 50 samples were analyzed by direct immersion of the gauze in culture medium (Method II - Qualitative): after rubbing the wet gauze on the outer surface of the HSDE, it was placed directly in Fluid Thioglycollate culture medium. The tube containing the gauze was shaken in a vortex mixer and then incubated at 37 ° C for 21 days. Results: samples analyzed by Method I, showed positive growth in 27/50 (54%) of the samples within the range of 100 to 102 CFU/sample. Of this total, 7 different microorganisms were identified, represented by 37.1% of coagulase-negative Staphylococcus, 28.5% of Bacillus spp, 17.1% of non-sporulating Gram-positive bacillus, 5.7% of Micrococcus spp, 5.7 % of Penicillium spp, 2.8% of Acinetobacter baumannii and 2.8% of Candida spp. In the group analyzed by Method II, the total number of tubes with positive growth was 12/50 (24%) samples. Of this total, we identified 2 different microorganisms, being 38.4% of Gram-positive bacillus nonspecific, followed by Staphylococcus spp and Peptococcus spp with the same percentage of positivity of 30.7% each. The negative control group, composed of samples subjected to cleaning and sterilization consecutive showed satisfactory results. The average growth found in the positive control group was 17.5 CFU/sample, except for one sample that showed growth uncountable. Conclusion: the results of the present study do not support the practice of decontamination of HSDE with 70% ethanol without previous cleaning, based on the evidence of microorganism survival that did not meet the expected bactericidal and fungicidal action of alcohol as an intermediate level disinfectant. Another aspect that reinforces the disapproval this practice, it is the consideration that the micro-organisms recovered, even being low pathogenic potential, may behave as anfibionte, which are capable of harming the host when the environmental and immune conditions are favorable to micro-organisms, causing infection.

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