Em dezembro de 2019, um surto de pneumonia começou na China e se espalhou por várias regiões geográficas, sendo causado pelo vírus que chamamos de Coronavírus, ou como muitos chamam, Covid -19. Os dados acerca do vírus relatam que o mesmo apresenta uma elevada capacidade de infecção. Levando em conta as características de um atendimento odontológico, que incluem uma proximidade face a face entre os cirurgiões-dentistas e pacientes, faz-se necessário um cuidado redobrado em relação ao manejo do paciente, limpeza do consultório e proteção dos profissionais. Essas medidas passam por uma boa orientação e um correto manejo do paciente; uma exímia limpeza do consultório; uma impecável esterilização do instrumental odontológico; uso de todos os equipamentos de proteção individual; assim como uma postura exemplar ao ser fiel a todos os tópicos citados anteriormente. No entanto, são medidas bastante necessárias e essenciais por se tratarem de condutas para conter e prevenir a contaminação pelo Covid-19 quanto mais aderirmos a essas medidas, mais rapidamente passaremos por essa Pandemia.
Background: This experimental study assessed reverse torque of indexed and nonindexed (NI) abutments in Morse Taper (MT) implants in a mechanical fatigue test. Materials and Methods: In this experimental study It was used 37 implants MT and over them installed Pilar Flex abutments (4.8 mm × 6 mm × 1.5 mm). The groups were as follows: Group A used 19 MT implants with a NI Pilar Flex abutment loaded with 32 N/cm and Group B used 18 MT implants with an indexed (IN) Pilar Flex abutment loaded with 20 N/cm. The abutments were tested according to ISO standard 14801/2007. The specimens were installed at 30° from the axial axis and underwent a 133 N load, 4 Hz frequency, and 1,000,000 cycles. Once the test was completed, the reverse torque was provided by an electronic torque meter. Data were submitted to statistical analysis using the t -test for independent samples and paired t -test. The significance level was considered P < 0.05. Results: Results obtained showed that the indexed Pilar Flex abutment had a percentage of torque loss from the initial torque of 49% and the NI Pilar Flex abutment lost 14%. Paired Student's t -tests revealed that for both NI ( P < 0.001) and indexed ( P < 0.001) abutments, the counter torque values were significantly lower than those applied at the initial torque. Conclusion: According on the methodology used, the NI Pilar Flex abutment was more effective regarding the reverse torque in single-unit implant prostheses versus the indexed Pilar Flex abutment. A greater loosening in the indexed Pilar Flex abutment retaining screw was noted in the reverse torque test, and the Pilar Flex abutment failed to show good outcomes related to the cold welding effect.
Desde que foram registrados os primeiros contágios, uma infecção por coronavírus (Covid-19) deu uma maneira bastante rápida. Neste cenário, dentre os EPI's (Equipamentos de Proteção Individual), os que mais ganharam destaque no combate à doença foram as máscaras cirúrgicas como forma de prevenção desse contágio. Alguns protocolos devem ser seguidos para usar como máscaras de maneira correta. Além das máscaras cirúrgicas, nos casos aplicáveis, faz-se necessário o uso de máscaras de proteção respiratória. No entanto, como máscaras cirúrgicas e de proteção respiratória cirúrgica vem desempenhando um papel importante no controle da disseminação desse microrganismo e são monitorados por um excelente método de acesso acessível.
This study aims to assess the biomechanical behavior of the alveolar bone surrounding the implants over protocol with metal, Polyether ether ketone (PEEK) and Zantex bars, in normal and osteoporotic conditions. For the simulation, geometric models of the mandibular arch were designed containing 5 implants and two variables. The first variable is the bone condition - normal and osteoporotic-, and the second is the material used in the protocol bars – metal, PEEK and Zantex. Simulation was performed using the Finite Elements Method. Results showed that the largest load peaks were concentrated in the medullary bone, both in the normal and osteoporotic conditions. The osteoporotic bone was subjected to more loads than the normal bone in all simulated structures. PEEK and Zantex bars are generally effective load dissipators, showing better performance than Ni-Cr in both types of bone. It is important to assess the bone condition and its relationship with the material used in protocol-type prostheses infrastructure.
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