Here we present the case of a 79-year-old woman who complained of acute abdominal pain, vomiting and diarrhoea. Laboratory exams demonstrated a severe metabolic imbalance. Abdominal X-rays showed bowel overdistension and pneumatosis of the stomach wall. Abdominal tomography revealed infarction of the stomach, duodenum and small bowel due to thrombosis of the celiacomesenteric trunk. Exploratory laparotomy revealed ischemia of the liver, spleen infarction and necrosis of the gastro-intestinal tube (from the stomach up to the first third of the transverse colon). No further surgical procedures were performed. The patient died the following day. To our knowledge, this is the first reported case about severe gastro-intestinal ischemia due to thrombosis of the celiacomesenteric trunk, a rare anatomic variation of the gastrointestinal vascularisation.
Introduction: This study aims to analyze the influence of particles size of sol-gel derived calcium silicate particles in the setting reaction of bioactive endodontic cements. Materials and Methods: Sol-gel derived calcium silicate particles were synthesized and sieved to separate the particles in different sizes: CS400, CS200, and CS100. A commercial MTA (Control) was used as control. The particle size and the specific surface area were assessed by laser diffraction and nitrogen adsorption. The cements were prepared with water as the liquid for the reaction. The setting time was conducted according to ISO 6876, and the setting kinetics was analyzed by Fourier transformed infrared spectroscopy (FTIR) at different time points between 120s to 72h. Results: The particle size varied from 9.45µm (CS400 ) to 31.01 (Control). The higher specific surface area valuer reached 15.14g/cm2 in the CS400. The smallest particle sizes, the higher specific surface area, and the lowest setting time were found for CS400 (p < 0.05). Control presented the highest setting time (p < 0.05). The FTIR analyses showed the differences in materials structure over time, with faster hydration and crystallization for CS400. The setting kinetics was slower for Control even when compared to a sol-gel derived group with similar particle size. Conclusion: The route of synthesis and the particle size influences the setting reaction of calcium silicate-based cements. The reduction of particle size for sol-gel derived calcium silicates lead to the acceleration of the setting reaction of the produced bioactive endodontic cement.
O objetivo do presente estudo foi desenvolver um Objeto Virtual de Aprendizagem (OVA) sobre materiais de moldagem, com ênfase no alginato, e avaliar a influência do seu uso sobre o aprendizado teórico e habilidade clínica de estudantes de Odontologia, assim como sobre as propriedades física e mecânica material. Sessenta e quatro estudantes receberam aula teórica expositiva sobre alginato e posteriormente foram divididos em 2 grupos, Controle (n=30) e OVA (n=34). O grupo OVA teve acesso à ferramenta educacional composta de conteúdo teórico e simulação de espatulação do alginato, sendo sua habilidade avaliada. Todos os participantes realizaram um pré-teste após a aula teórica, assim como testes de habilidade de manipulação do material, o qual foi submetido a ensaio de resistência à compressão e reprodução de detalhes. Uma avaliação pós-teste foi realizada após quinze dias. Os resultados dos grupos foram comparados pelo teste t, modelo de regressão logística e as variáveis significativas foram incluídas no modelo de regressão múltipla. Todas as análises foram conduzidas com significância de 5%. Na simulação do OVA 75% dos usuários obtiveram nota máxima e os resultados das avaliações teóricas não indicaram diferença estatística entre os grupos. O uso do OVA está relacionado à maior habilidade clínica, com 3,76 mais chances de correta incorporação do pó. No ensaio de resistência à compressão a média dos grupos foi superior ao preconizado pela norma, OVA 0,86±0,03 e Controle 1,09±0,04. A ferramenta desenvolvida exerce influência positiva sobre a habilidade clínica e propriedade mecânica do material estudado, constituindo-se como promissora estratégia de aprendizagem virtual.
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