Reabilitação com implantes dentários em doentes periodontais

Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas MonizOs implantes dentários são considerados, atualmente, uma alternativa de reabilitação oral em pacientes desdentados, devido à estética, funcionalidade e à efetividade que proporcionam. Apesar das diversas vantagens e das elevadas taxas de sobrevivência, têm sido relatadas complicações e casos de insucesso. A periodontite é uma doença inflamatória oportunista do periodonto e é amplamente considerada como uma das doenças mais comuns em todo o mundo, sendo uma das principais causas de perda de peças dentárias. Tendo em conta que a reabilitação com implantes é uma opção terapêutica muito utilizada em pacientes edêntulos por doença periodontal, torna-se pertinente avaliar os fatores que condicionam o prognóstico da mesma. Os estudos analisados concluem que a reabilitação com implantes dentários é uma opção de tratamento viável para os doentes periodontais, contudo, há evidência de que os pacientes com história de doença periodontal podem apresentar um risco superior no que diz respeito à falha dos implantes e a complicações futuras, incluindo periimplantite e uma maior perda de osso de suporte, em comparação com pacientes peridontalmente saudáveis. Deste modo, a reabilitação com implantes dentários em pacientes periodontais não está contraindicada, desde que esta seja precedida por uma avaliação periodontal completa e estabilização da doença. Para uma maior longevidade e sucesso do tratamento, é igualmente importante que o paciente compareça regularmente às consultas de manutenção.Dental implants are currently reputed as an oral rehabilitation alternative in edentulous patients due to their aesthetics, functionality and effectiveness. Despite the many advantages of this type of rehabilitation and the high survival rates, complications and cases of failure have been reported. Periodontitis is an opportunistic inflammatory disease of the periodontium and is broadly considered one of the most common diseases worldwide, being one of the main causes of tooth loss. Taking into account that implant rehabilitation is a widely adopted option by edentulous patients due to periodontal disease, it is relevant to evaluate the factors that might limit the use of this therapeutic option. The studies that have been analyzed establish that dental implant rehabilitation is a viable treatment option for periodontal patients, however there are evidences that patients with a history of periodontal disease may present a higher risk of implant failure and future complications, including peri-implantitis and a bigger support bone loss, compared with periodontally healthy patients. Thus, rehabilitation with dental implants in periodontal patients is not contraindicated, provided that it is preceded by a complete periodontal evaluation and stabilization of the disease. For a bigger longevity and success of the treatment, it is equally important that the patient attends regularly to the maintenance appointments

Experiences with scheduling and mapping games for adaptive distributed systems : Summary

We apply the concept of "games with a purpose" to NPcomplete mapping and scheduling problems in distributed systems and report our experiences. The particular context is a scheduling and mapping problem that emerges when running parallel applications in a distributed virtualized computing environment, specifically BSP applications in our Virtuoso system. We describe the design and implementation of an interface that presents the problem as a game, and a user study we undertook to evaluate the interface. The results show that there is promise at least at small scales, most of our naive users are able to find solutions that are reasonable.link_to_subscribed_fulltex

Time-Sharing Parallel Applications with Performance Isolation and Control

Most parallel machines, such as clusters, are spaceshared in order to isolate batch parallel applications from each other and optimize their performance. However, this leads to low utilization or potentially long waiting times. We propose a self-adaptive approach to time-sharing such machines that provides isolation and allows the execution rate of an application to be tightly controlled by the administrator. Our approach combines a periodic real-time scheduler on each node with a global feedback-based control system that governs the local schedulers. We have developed an online system that implements our approach. The system takes as input a target execution rate for each application, and automatically and continuously adjusts the applications' realtime schedules to achieve those rates with proportional CPU utilization. Target rates can be dynamically adjusted. Applications are performance-isolated from each other and from other work that is not using our system. We present an extensive evaluation that shows that the system remains stable with low response times, and that our focus on CPU isolation and control does not come at the significant expense of network I/O, disk I/O, or memory isolation. © 2007 IEEE.link_to_subscribed_fulltex

Time-sharing parallel applications through performance-targeted feedback-controlled real-time scheduling

Most parallel machines, such as clusters, are space-shared in order to isolate batch parallel applications from each other and optimize their performance. However, this leads to low utilization or potentially long waiting times. We propose a self-adaptive approach to time-sharing such machines that provides isolation and allows the execution rate of an application to be tightly controlled by the administrator. Our approach combines a periodic real-time scheduler on each node with a global feedback-based control system that governs the local schedulers. We have developed an online system that implements our approach. The system takes as input a target execution rate for each application, and automatically and continuously adjusts the applications' real-time schedules to achieve those rates with proportional CPU utilization. Target rates can be dynamically adjusted. Applications are performance-isolated from each other and from other work that is not using our system. We present an extensive evaluation that shows that the system remains stable with low response times, and that our focus on CPU isolation and control does not come at the significant expense of network I/O, disk I/O, or memory isolation. © Springer Science+Business Media, LLC 2008.link_to_subscribed_fulltex

Power reduction through measurement and modeling of users and CPUs: Summary

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Power reduction through measurement and modeling of users and CPUs: Summary

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