Avaliação "in vitro" do comportamento de dois agentes termicos e da influencia da espessura amelo-dentinaria na variação de temperatura em dentes humanos

Dissertação (Mestrado) - Universidade Federal de Santa Catarina, Centro de Ciencias da SaudeEste estudo determinou as variações de temperatura na face externa da coroa e na junção dentina/polpa correspondente, provocadas pela aplicação de dois agentes térmicos - bastão de gelo e diclorodifluorometano - em dentes incisivos inferiores e canino superiores; avaliou também, a influência da espessura de tecidos duros - esmalte e dentina - sobre essa variação térmica. Abstract : This research had the purpose to determine "in vitro" the temperature variations after the ice stick and the DDM (diclorodifluoromethane) were applied in the buccal surface of the crown and in the dentine/pulp wall in the same plane, in the lower anterior teeth and in the upper canines; and determinate the enamel/dentine thickness according to these thermical variations . The teeth were joined in 2 groups of 10 specimens each and were tested in 4 conditions. Each specimen was prepared and receaved 2 termopair (" body test") . Each "body test" was fixed in a fibberplate and was dived in a hotwater device at 37°C. The data was taken in a computer system and about 150 measures of external and internal temperatures ( Te, Ti ) were recorded corresponding each one a time of 1/3 second . The next time of the tests the specimens were cut in the middle ( longitudinal plane) and measures of enamel/dentine thickness were taken in a optical microscope. The results determined the temperature variations at the buccal surface of the specimens (Te) and in the dentine/pulp wall (Ti) and the thickness of hard tissues in the tested teeth . The author concluded, in the tests conditions, that the ice stick application resulted in a decreasing of Te of about 37°C and the DDM deoreased the Te in about 60°C . He also concluded that the ice produced a constant temperature during the time of the application and the DDM has a high capacity of refrigeration in the first five seconds of the experiment, gaining temperature after this time. Yet, the author observed that in the thicker specimens the decreasing of Ti was less than in the specimens of less thickness of enamel/dentine for the two cool agents. Nevertheless, determinated that the enamel/dentine thickness was less on the lower incisors than on the tested canines

The application of adaptive systems in condition monitoring

This paper provides an overview of four large collaborative projects, which are currently being undertaken by the Centre for Adaptive Systems at the University of Sunderland. The projects utilise adaptive system technology to solve condition monitoring problems, and are funded from a variety of sources including UK Government agencies and the European Union (EU). Each of the projects is very strongly problem and industry driven and aims to produce real results for the benefit of companies

Mandíbulas Edêntulas severamente reabsorvidas tratadas com implantes curtos – apresentação de 4 casos clínicos e controle de 30 a 36 meses

As atrofias severas da mandíbula apresentam grande dificuldade de tratamento, seja através de próteses convencionais, seja por próteses implanto-suportadas. Várias técnicas são descritas para o aumento vertical do rebordo ósseo. Todas apresentam alta morbidade, dificuldade técnica e prognóstico duvidoso. Os implantes curtos apresentam uma solução mais simples, menos mórbida e atualmente apresentam prognóstico semelhante aos de tamanho convencional. O objetivo deste trabalho é apresentar 4 casos consecutivos de mandíbulas severamente reabsorvidas e tratadas com implantes de 7,5 a 10mm de comprimento e próteses tipo protocolo. Neste casos foram instalados 12 implantes sendo que apenas um não apresentou sucesso sendo substituído por outro implante instalado em carga imediata. Estes casos foram acompanhados por 30 a 36 meses não havendo nenhuma perda de implante após a instalação das próteses e havendo uma perda óssea perimplantar média de 0,71mm. Os casos apresentados mostram que o tratamento com 4 implantes de tamanho reduzido retendo prótese tipo protocolo são uma boa opção para o tratamento das mandíbuals atróficas