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.

A cavidade oral apresenta características bastante abrangentes para o desenvolvimento de microorganismos e é considerada uma abertura para a entrada dos mesmos. Microrganismos causados ​​pela boca podem causar infecções generalizadas, como pneumonia e sepse. Em pacientes internados em unidades de terapia intensiva (UTIs), muitas dessas complicações podem ser evitadas caso o tratamento esteja vinculado a um atendimento odontológico. Esses atendimentos são feitos nas luvas e realizados por cirurgiões dentistas da UTI. Frente a Pandemia que vive nos dias de hoje, criou um protocolo de alta proteção bucal e, caso haja necessidade de intervenção odontológica na UTI, na frente de coronavírus. Dessa forma, é essencial que os cirurgiões dentistas,assim como os demais profissionais que trabalham nas UTIs no dia a dia como medidas preventivas preconizadas para diminuir o risco de contaminação e transmissão. Dessa forma, haverá mais segurança para a equipe, o paciente e o próprio profissional.

The aim of this study is to test and compare the flexural strength of milled polymer bars, with and without glass fiber reinforcement. The number of samples in the study was defined through a pilot study on a universal testing machine (EMIC) (n = 5). The brands analyzed in this study were Arch Free Metal, Zantex, Bioplas and PEEK. All samples were submitted to thermal aging before the three-point flexural test. Fracture patterns were analyzed using a Scanning Electron Microscope. Results show that the Arch Free Metal bar presented the largest flexural strength, followed by Zantex and PEEK bars, that lacked statistical difference, and Bioplas bars. Regarding fracture patterns, Arch Free Metal and Zantex bars were partially fractured and showed partial glass fiber rupture; PEEK bars were not fractured and showed plastic behavior; and Bioplas bars were fractured. It is possible to conclude that the reinforced polymer bar Arch Free Metal has a better performance in terms of flexural strength than the other tested materials.

The present study assesses the shear strength of Polyether Ether Ketone (PEEK) and Zantex to thermopolymerizable acrylic resin (TAR) with different surface treatments. To this end, 100 test specimens were produced and divided into two groups: G1(PEEK + TAR) and G2 (Zantex + TAR). Each group was subdivided into the subgroups A, B, C, D and E (n=10) according to surface pre-treatment: A: TAR + PEEK/Zantex without surface treatment (control); B: TAR + PEEK/Zantex treated with Palabond; C: TAR + PEEK/Zantex blasted with aluminum oxide (Al2O3) of 125 µm; D: TAR + PEEK /Zantex treated with Al2O3 of 125 µm  + Palabond; and E: TAR + PEEK/Zantex prepared with groove-shaped retentions. The structures were tested in a Universal testing machine EMIC DL2000. Two-way variance analysis showed significant difference between materials and surface treatments (p < 0.001). Multiple comparisons were done with Tukey’s test and failure modes were analyzed with the G test. Statistical analysis showed that Zantex outperformed PEEK for most treatments and showed similar performance in the subgroups treated with Al2O3. Within the PEEK group, the use of grooves and Palabond combined with blasting showed the best results; in the Zantex group, the best results were obtained with Palabond and Palabond combined with blasting. Regarding failure modes, PEEK showed only adhesive failures and Zantex’s failures were dependent on treatment. Therefore, the surface treatment method applied to the polymers studied here contribute to the material’s adhesion to acrylic resin.

O novo Coronavirus (SARS-CoV-2) representa um desafio para a Organização Mundial de Saúde (OMS) e para os sistemas de saúde no Brasil e em todo o mundo. O vírus possui alta transmissibilidade e é responsável pela doença Covid- 19, causadora de quadros respiratórios que variam de leves a graves (Zhou et. al, 2020). Poucos meses após o início da epidemia na China no final de 2019, já haviam mais de 2 milhões de casos e 120 mil mortes no mundo por COVID 19 (Werneck, Carvalho, 2020). Essa nova doença possui rápida progressão e tem provocado mortes em todo o mundo gerando preocupação nos governantes e em toda população mundial. A OMS decretou a pandemia da Covid-19 em 11 de março de 2020 e em 20 de março de 2020 o Brasil declarou transmissão sustentada da doença. Os profissionais da atenção básica, por conhecerem e atuarem próximos aos usuários, compreendem o processo de adoecimento e conseguem captar rapidamente os surtos e epidemias em sua região de saúde. Dessa forma pode-se propor em tempo oportuno estratégias para o enfrentamento dessas situações de saúde. Diante desse processo esses profissionais são extremamente vulneráveis à contaminação pelo novo Coronavírus e a população nem sempre possui consciência desse fator de risco. Portanto o conhecimento do comportamento da população local frente a pandemia se torna importante. Diante do exposto, o presente estudo tem como objetivo avaliar o entendimento e o nível de conscientização dos usuários das unidades básicas de saúde (UBS) do munícipio de Cláudio - Minas Gerais com relação ao novo Coronavírus, na visão dos profissionais que compõem as equipes de saúde da família do SUS.