RESUMEN

COVID-19 is characterized by severe acute lung injury, which is associated with neutrophils infiltration and release of neutrophil extracellular traps (NETs). COVID-19 treatment options are scarce. Previous work has shown an increase in NETs release in the lung and plasma of COVID-19 patients suggesting that drugs that prevent NETs formation or release could be potential therapeutic approaches for COVID-19 treatment. Here, we report the efficacy of NET-degrading DNase I treatment in a murine model of COVID-19. DNase I decreased detectable levels of NETs, improved clinical disease, and reduced lung, heart, and kidney injuries in SARS-CoV-2-infected K18-hACE2 mice. Furthermore, our findings indicate a potential deleterious role for NETs lung tissue in vivo and lung epithelial (A549) cells in vitro, which might explain part of the pathophysiology of severe COVID-19. This deleterious effect was diminished by the treatment with DNase I. Together, our results support the role of NETs in COVID-19 immunopathology and highlight NETs disruption pharmacological approaches as a potential strategy to ameliorate COVID-19 clinical outcomes.

RESUMEN

Every day have been increased the number of patients in the dental office looking for oral reabilitações, many of them being a challenge to the dentist surgeon. Currently, implants are installed on guided bone regeneration, the use of membranes, titanium threads and bone substitutes are key parts for correcting bone defects and to support the implant. Thereunto, the aim of this study was the description of a case addressing the methods and materials used for guided bone regeneration with the use of L-PRF for vertical bone gain. The patient showed the absence of the elements 22, 23 and 24, and a bony defect arc in this region. The installation of the implants, followed by guided bone regeneration support with a titanium mesh was indicated. The use of guided bone regeneration technique involving the mesh titanium implants, bone and lyophilized bovine L-PRF membrane showed a viable technique, the succeeding vertical bone gain until the implant platform.

RESUMEN

The aim of this study was to describe surgical features of resection of hemimelic epiphyseal dysplasia of the patella. We already described the clinical and imaging features in another article. The patient was a six-year-old boy with a tumor in his right knee measuring 12 cm longitudinally and 6 cm transversally, which was adhering to the patella and had been slowly growing for two years. Biopsy findings were suggestive of a benign osteochondromatous lesion, without a defined diagnosis. Imaging examinations such as radiography and tomography showed areas of bone formation and radiotransparent areas, while magnetic resonance imaging showed areas of hypo and hypersignal in T1 and T2, of estimated size 8.5 cm longitudinally and 6 cm transversally. The tumor growth was surgically resected and curettage was performed on the epiphyseal nucleus of ossification of the upper and medial centers of the patella, with good patellar remodeling and normal development. The patient did not present any recurrence of the lesion up to the time of reaching skeletal maturity...

Descrever aspectos cirúrgicos da ressecção de displasia epifisária hemimélica da patela. Os aspectos clínicos e de imagem já foram descritos em outro artigo. Paciente masculino, seis anos, com tumor de crescimento lento em joelho direito, por dois anos, com dimensões de 12 cm no eixo longitudinal e 6 cm no transversal, aderido à patela. Biópsia sugeriu lesão osteocondromatosa benigna, sem diagnóstico definido. Exames de imagem, como radiografias e tomografias, com áreas de formação óssea e áreas radiotransparentes e na ressonância magnética áreas de hipo e hiperssinal em T1 e T2, de tamanho estimado em 8,5 cm no eixo longitudinal e 6 cm no transversal. Foram feitas ressecção cirúrgica da tumoração e curetagem do núcleo de ossificação epifisário do polo superior e medial da patela, com boa remodelação patelar e desenvolvimento normal. Paciente não apresentou recidiva da lesão até o término da maturidade esquelética...

Asunto(s)

RESUMEN

The aim of this study was to describe surgical features of resection of hemimelic epiphyseal dysplasia of the patella. We already described the clinical and imaging features in another article. The patient was a six-year-old boy with a tumor in his right knee measuring 12 cm longitudinally and 6 cm transversally, which was adhering to the patella and had been slowly growing for two years. Biopsy findings were suggestive of a benign osteochondromatous lesion, without a defined diagnosis. Imaging examinations such as radiography and tomography showed areas of bone formation and radiotransparent areas, while magnetic resonance imaging showed areas of hypo and hypersignal in T1 and T2, of estimated size 8.5 cm longitudinally and 6 cm transversally. The tumor growth was surgically resected and curettage was performed on the epiphyseal nucleus of ossification of the upper and medial centers of the patella, with good patellar remodeling and normal development. The patient did not present any recurrence of the lesion up to the time of reaching skeletal maturity.

Descrever aspectos cirúrgicos da ressecção de displasia epifisária hemimélica da patela. Os aspectos clínicos e de imagem já foram descritos em outro artigo. Paciente masculino, seis anos, com tumor de crescimento lento em joelho direito, por dois anos, com dimensões de 12 cm no eixo longitudinal e 6 cm no transversal, aderido à patela. Biópsia sugeriu lesão osteocondromatosa benigna, sem diagnóstico definido. Exames de imagem, como radiografias e tomografias, com áreas de formação óssea e áreas radiotransparentes e na ressonância magnética áreas de hipo e hiperssinal em T1 e T2, de tamanho estimado em 8,5 cm no eixo longitudinal e 6 cm no transversal. Foram feitas ressecção cirúrgica da tumoração e curetagem do núcleo de ossificação epifisário do polo superior e medial da patela, com boa remodelação patelar e desenvolvimento normal. Paciente não apresentou recidiva da lesão até o término da maturidade esquelética.

RESUMEN

Os autores apresentam uma técnica de pigmentaçäo intrínseca de bases de prótese através da incorporaçäo em camadas de fios de lä acrílica na resina de cura térmica. O método de caracterizaçäo utilizado reproduz a translucidez, a profundidade e os tons dos tecidos gengivais, tornando a base da prótese mais natural

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