Effectiveness of intraoral suction systems and aspirating tips for evacuation of aluminum oxide particles during use of air-abrasion

Aim: The purpose of this study was to compare the effectiveness of a high-volume evacuation and a conventional intraoral suction system and aspirating tips for capturing aluminum oxide particles during use of an air-abrasion device. Methods: A phantom head was fixed at the dental chair head with secured a metallic device with 5 horizontal shafts, corresponding to operator's clockrelated working positions, and one vertical shaft to simulate the operator's nasal cavity. Petri plates were fixed to the shafts at distances of 20, 40 and 60 cm from the center of the oral cavity of the phantom head to collect the aluminum oxide particles spread over during air abrasion. The dust was aspirated with two types of suction tips used with both suction systems: a conventional saliva ejector and a saliva ejector customized by the adaptation of a 55-mm-diameter funnel. Results: The amount of particles showed that the greatest abrasive particle deposition occurred at a distance of 20 cm from the center of the oral cavity of the phantom head at 9 o'clock operatory position with the conventional saliva ejector attached to high-volume evacuation system. Conclusions: The greatest deposition of aluminum oxide particles occurred at the shortest distance between the operator and the center of the oral cavity, while using the high-volume evacuation system associated to the conventional suction tip.

Investigação dos efeitos tóxicos, mutagênicos e genotóxicos do herbicida Trifluralina, utilizando Allium cepa e Oreochromis niloticus como sistemas-testes

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Evolución reciente y retos de la industria manufacturera de exportación en Centroamérica, México y República Dominicana: una perspectiva regional y sectorial

Incluye Bibliografía

Perdas na colheita e qualidade da fibra de cultivares de algodão adensado em função de sistemas de colheita

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Análise quantitativa das partículas de óxido de alumínio geradas na abrasão a ar em consultório odontológico

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Atributos físicos e químicos do solo e desenvolvimento de laranja-pera em função de doses de cinza de bagaço de cana-de-açúcar

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Carbono orgânico solúvel em água no material particulado de regiões canavieiras do Estado de São Paulo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efeitos da pressão crítica (25 cm H2O) e mínima de selo do balonete de tubos traqueais sobre a mucosa traqueal do cão

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Desenvolvimento e avaliação de sistemas de aplicação de defensivos para a citricultura

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Efeitos na expansão volêmica e na oxigenação sistêmica e gastrointestinal após reposição com hidroxietilamido, associado ou não à solução salina hipertônica, e Ringer lactato em cães submetidos a choque hemorrágico

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Proposta de modelo de gestão de resíduos da construção civil para a zona leste da cidade de Teresina - PI

Pós-graduação em Geografia - IGCE

METABOLIC IMPLICATIONS OF PERITONEAL DIALYSIS IN PATIENTS WITH ACUTE KIDNEY INJURY

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Diuron-induced rat urinary bladder carcinogenesis: Mode of action and human relevance evaluations using the International Programme on Chemical Safety framework

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Projeto de um sistema anaeróbico para estabilização de lodo e recuperação de energia

The treatment of domestic and industrial effluents through Wastewater Treatment Plants (WTPs) generates a residue termed sewage sludge, rich in organic matter, high-volume, occasionally containing pathogens and heavy metals. The sludge generation can minimize the benefits brought by the treatment of sewage, because this residue does not always receive appropriate treatment before final disposal. The disposal is another problem related to sludge. Landfills generally does not have physical space and alternatives such as the use in agriculture requires an intense treatment that could be in many cases operational or economic unfeasible. The objective of this work is the theoretical research about the processes of stabilization of the sludge by anaerobic digestion and the methanogenic activity during the process. Through analysis of each step and contemplating each relevant factor in anaerobic digestion process in order to optimize them, we proposed a theoretical model of reactors capable of stabilize the sludge, reduce its volume and eliminate pathogens. The obtained configuration consists of two anaerobic reactors connected in series. The first one operates in the range mesophilic temperature (35 ° C) and has higher hydraulic retention time (25 days) working primarily in the stabilization of organic matter present in the sludge and producing biogas, whereas the second one operates in the thermophilic range (55 ° C) in order to eliminate pathogens, and to reduce the volume. The hydraulic retention time in the second reactor is lower (10 days). Both mesophilic and thermophilic processes were efficient in what was proposed, promoting the stabilization of organic matter present in the sludge and significant reduction of pathogens. As a final step with the sludge previously digested, it is indicated a final dehydration... (Complete abstract click electronic access below)

Rainwater major and trace element contents in Southeastern Brazil: an assessment of a sugar cane region in dry and wet period

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)