Effects of sulfur-based hemostatic agents and gingival retraction cords handled with latex gloves on the polymerization of polyvinyl siloxane impression materials

OBJECTIVES: This study investigated the possible interactions between three addition silicone materials (Express®, Aquasil Ultra® and Adsil®), three hemostatic agents (ferric sulfate, StatGel FS®; aluminum sulfate, GelCord®; and aluminum chloride, Hemostop®) and gingival retraction cords previously handled with latex gloves to determine whether direct contact with medicaments or indirect contamination by latex in conditions similar to those found in clinical practice inhibit or affect the setting of the impression materials. MATERIAL AND METHODS: A portable device for the simultaneous test of several specimens was specifically developed for this study. Polymerization inhibition was analyzed by examination of the impressions and the molded surface. Ten trials were performed for each addition silicone material used in the study, at a total of 240 study samples. RESULTS: All the samples tested (N=240) were nonreactive regardless of the type of combination used. CONCLUSIONS: Aluminum sulfate, ferric sulfate and aluminum chloride hemostatic solutions did not show any inhibitory potential on the addition silicone samples under study, and there were no changes in polymerization as a result of contact between addition silicone and retraction cords handled with latex gloves

Laudo Pericial em Antropologia Forense

Laudo técnico antropológico para estimativa de perfil biológico e fatores individualizantes para fins de identificação humana. Caso analisado: Indivíduo nº 014 - Coleção Cemiterial do IEPCF - Guarulhos/LEA UNIFES

Procedural and political aspects of forensic exhumation in Brazil

Exhumation may be defined as the legally sanctioned excavation and recovery of the remains of lawfully buried or – occasionally – cremated individuals, as distinct from forensic excavations of clandestinely buried remains conducted as part of a criminal investigation and from unlawful disinterment of human remains, commonly referred to as ‘bodysnatching’. The aim of this article is to review the role of exhumation – so defined – in the activities of CEMEL, the Medico-Legal Centre of the Ribeirão Preto Medical School-University of São Paulo, in international, regional and local collaborations. Exhumations form part of routine forensic anthropology casework; scientific research in physical and forensic anthropology; and forensic casework conducted in collaboration with the Brazilian Federal Police; and are carried out as part of humanitarian investigations into deaths associated with the civil–military dictatorship of 1964 to 1985. This article aims to offer a non-technical summary – with reference to international comparative information – of the role of exhumation in investigative and scientific work and to discuss developments in their historical and political context

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain understudied.8–11 In the American tropics, Amazonia stands out as the world’s most diverse rainforest and the primary source of Neotropical biodiversity,12 but it remains among the least known forests in America and is often underrepre sented in biodiversity databases.13–15 To worsen this situation, human-induced modifications16,17 may elim inate pieces of the Amazon’s biodiversity puzzle before we can use them to understand how ecological com munities are responding. To increase generalization and applicability of biodiversity knowledge,18,19 it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple or ganism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region’s vulnerability to environmental change. 15%–18% of the most ne glected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lostinfo:eu-repo/semantics/publishedVersio

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear understanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5,6,7 vast areas of the tropics remain understudied.8,9,10,11 In the American tropics, Amazonia stands out as the world's most diverse rainforest and the primary source of Neotropical biodiversity,12 but it remains among the least known forests in America and is often underrepresented in biodiversity databases.13,14,15 To worsen this situation, human-induced modifications16,17 may eliminate pieces of the Amazon's biodiversity puzzle before we can use them to understand how ecological communities are responding. To increase generalization and applicability of biodiversity knowledge,18,19 it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple organism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region's vulnerability to environmental change. 15%–18% of the most neglected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lost

Estudo das alterações de polimerização das siliconas de adição, decorrentes de seu contato com soluções adstringentes e fios de afastamento gengival manipulados com luvas de látex

Dissertação (Mestrado em Ciencias da Saúde)—Universidade de Brasília, Programa de Pós-graduação em Ciências da Saúde.Texto parcialmente liberado pelo autor. Conteúdo disponível: Resumo.O presente trabalho teve por finalidade estudar, in vitro, as possíveis interações entre três marcas de siliconas de adição (Adsil, Vigodent, Brasil; Express, 3M, EUA; Aquasil Ultra, Dentsply, EUA) e luvas de látex (Satari, Brasil; Embramac, Brasil), luvas de vinil (Volk, Brasil), soluções adstringentes à base de sulfato férrico (Stat-Gel, Pascal, EUA), sulfato de alumínio (GelCord, Pascal, EUA) e cloreto de alumínio (Hemostop, Dentsply, Brasil), bem como fios de afastamento gengival previamente manipulados com luvas de látex (contaminação indireta), com vistas a determinar se estas substâncias e compostos seriam capazes de inibir ou alterar o processo de presa dos materiais polivinílicos. A metodologia adotada contou com a utilização de um aparelho que permitiu a análise simultânea dos materiais questionados e grupos controle, baseando-se na análise superficial dos materiais de moldagem e superfícies moldadas. Os resultados do estudo indicaram que: (1) o látex promoveu inibição em todas as marcas de silicona; (2) o contato direto entre a luva de vinil da marca Volk e as siliconas de adição da marca Adsil e Express resultou no retardo de polimerização destes materiais; (3) o contato direto entre a silicona de adição da marca Aquasil Ultra e as amostras da luva de vinil não resultou em inibição ou retardo de polimerização; (4) as soluções de Sulfato Férrico, Sulfato de Alumínio e Cloreto de Alumínio não promoveram inibição ou retardo de polimerização em nenhuma das marcas de siliconas de adição testadas; (5) A utilização de fios de afastamento gengival manipulados com luvas de látex, independente do tipo de adstringente associado, não promoveu inibição ou retardo de polimerização em nenhuma das marcas de siliconas de adição testadas

Effects of sulfur-based hemostatic agents and gingival retraction cords handled with latex gloves on the polymerization of polyvinyl siloxane impression materials

OBJECTIVES: This study investigated the possible interactions between three addition silicone materials (Express®, Aquasil Ultra® and Adsil®), three hemostatic agents (ferric sulfate, StatGel FS®; aluminum sulfate, GelCord®; and aluminum chloride, Hemostop®) and gingival retraction cords previously handled with latex gloves to determine whether direct contact with medicaments or indirect contamination by latex in conditions similar to those found in clinical practice inhibit or affect the setting of the impression materials. MATERIAL AND METHODS: A portable device for the simultaneous test of several specimens was specifically developed for this study. Polymerization inhibition was analyzed by examination of the impressions and the molded surface. Ten trials were performed for each addition silicone material used in the study, at a total of 240 study samples. RESULTS: All the samples tested (N=240) were nonreactive regardless of the type of combination used. CONCLUSIONS: Aluminum sulfate, ferric sulfate and aluminum chloride hemostatic solutions did not show any inhibitory potential on the addition silicone samples under study, and there were no changes in polymerization as a result of contact between addition silicone and retraction cords handled with latex gloves