Comparative analysis of the biocompatibility of endothelial cells on surfaces treated by thermal plasma and cold atmospheric plasma.

In recent years, cold atmospheric plasma (CAP) is used for surface disinfection. However, little is known about its ability to improve biocompatibility of metallic surfaces when compared to thermal plasma methods. In this context, the study aimed to evaluate the response of human endothelial cells (Ea.hy926) on titanium surfaces treated by non-thermal plasma method and thermal plasma method under nitriding atmosphere. The wettability was characterized by the sessile drop method, the topography and roughness were evaluated by atomic force microscopy (AFM), and the microstructure by grazing angle X-ray diffraction (GIXRD). Endothelial cells were cultured and evaluated for morphology by scanning electron microscopy and viability by an MTT (3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide) assay. CAP treatment reduced the contact angle of the Ti surface (13.43° ± 1.48; p<0.05), increasing hydrophilicity. Rz roughness was higher on the nitrided surface (220.44±20.30; p< 0.001) compared to the CAP treated surfaces (83.29 ± 11.61; p< 0.001) and polished (75.98 ±34.21a); p<0.001). The different applied plasma treatments created different titanium surfaces improving the biocompatibility of endothelial cells, however CAP results demonstrate its potential for biomedical applications, considering the low cost and ease of use of the technique, allowing surface treatments before clinical procedures.

Oral lichen planus with cutaneous manifestations: case report with emphasis on dental diagnostic criteria / Líquen plano oral com manifestações cutâneas: relato de caso com ênfase nos critérios de diagnóstico odontológico

ABSTRACT Lichen planus is a chronic inflammatory disease involving the skin and mucosa, which often affects the oral cavity. The objective of this study is to report a case of oral lichen planus (OLP) with cutaneous manifestations and to discuss the clinical, histopathological aspects and the established treatment. A 61-years-old female white patient was referred for evaluation of white lesions in the oral mucosa. In the intraoral examination, multiple white lesions with striated appearance were observed in the jugal mucosa, tongue and border. The extraoral examination revealed scaly lesions on the arm, white spots on the legs, and nail dystrophy on feet. Based on biopsy of the oral lesions and the histopathological analysis, the diagnosis of OLP was confirmed. The patient underwent treatment with clobetasol propionate topical cream (0.5 mg), and was instructed to apply it to affected area, once or twice a day for four weeks. In the clinical follow-up after one month and 15 days, the improvement of the lesions could be analyzed. As OLP is a disease with an etiopathogenesis that is still poorly recognized, several factors may enable the development of this condition. Therefore, the dentist's clinical view is essential for the most effective treatment.

RESUMEN El liquen plano es una enfermedad inflamatoria crónica que involucra piel y mucosa, con frecuencia de la cavidad bucal. Los objetivos de este estudio son reportar un caso de liquen plano oral (LPO) con manifestaciones cutáneas y discutir sus aspectos clínicos e histopatológico, así como el tratamiento establecido. Reportamos el caso de una mujer de 61 años de edad, raza blanca, que fue remitida para evaluación de lesiones blancas en la mucosa bucal. En el examen intraoral se observaron lesiones blancas múltiples estriadas en mucosa yugal, lengua y cresta; en el examen extraoral, lesiones descamativas en el brazo, manchas blancas en las piernas y uñas distróficas en los pies. Basándose en la biopsia de las lesiones bucales y en el análisis histopatológico, el diagnóstico de LPO se confirmó. La paciente fue sometida a tratamiento con propionato de clobetasol crema (0,5 mg) y aconsejada a aplicar el medicamento sobre el área afectada, una o dos veces al día, por cuatro semanas. En el seguimiento clínico, al cabo de un mes y 15 días, fue posible analizar la mejoría de las lesiones. Por tratarse de una enfermedad de etiología todavía poco conocida, varios factores pueden favorecer su desarrollo. Así, el ojo clínico del cirujano dentista es imprescindible para un tratamiento más efectivo.

RESUMO O líquen plano é uma doença inflamatória crônica que envolve pele e mucosa, acometendo frequentemente a cavidade bucal. Os objetivos deste estudo são relatar um caso de líquen plano oral (LPO) com manifestações cutâneas e discutir os aspectos clínicos e histopatológicos, bem como o tratamento estabelecido. Relatamos o caso de uma mulher, 61 anos de idade, leucoderma, que foi encaminhada para avaliação de lesões brancas na mucosa bucal. Ao exame intraoral, foram observadas múltiplas lesões brancas com aspecto estriado em mucosa jugal, língua e rebordo; ao exame extraoral, lesões de aspecto descamativo no braço, manchas brancas nas pernas e unhas distróficas nos pés. Com base na biópsia das lesões bucais e na análise histopatológica, o diagnóstico de LPO foi confirmado. A paciente foi submetida ao tratamento com propionato de clobetasol em creme (0,5 mg) e orientada a fazer a aplicação na área afetada, uma a duas vezes ao dia, durante quatro semanas. No acompanhamento clínico após um mês e 15 dias, pôde-se analisar a melhora das lesões. Por se tratar de uma doença com etiopatogênese ainda pouco reconhecida, vários fatores podem possibilitar o desenvolvimento dessa condição. Dessa forma, é imprescindível o olhar clínico do cirurgião-dentista para o tratamento mais eficaz.

Plasma nitriding under low temperature improves the endothelial cell biocompatibility of 316L stainless steel.

OBJECTIVES: To evaluate the effects of the surface modification of 316L stainless steel (SS) by low-temperature plasma nitriding on endothelial cells for stent applications. RESULTS: X-ray diffraction (XRD) confirmed the incorporation of nitrogen into the treated steel. The surface treatment significantly increased SS roughness and hydrophilic characteristics. After 4 h the cells adhered to the nitride surfaces and formed clusters. During the 24 h incubation period, cell viability on the nitrided surface was higher compared to the polished surface. Nitriding reduced late apoptosis of rabbit aorta endothelial cell (RAEC) on the SS surface. CONCLUSION: Low temperature plasma nitriding improved the biocompatible of stainless steel for use in stents.

Effect of plasma-nitrided titanium surfaces on the differentiation of pre-osteoblastic cells.

A titanium surface nitrided by plasma contains nitrogen ions that guarantee resistance to corrosion and biocompatibility. Despite this, no descriptions concerning the influence of the expression of cell adhesion proteins and their influence on osteogenic cell differentiation are available. Thus, the present study aimed to assess the response of murine pre-osteoblastic cells (MC3T3-E1) cultured on nitrided titanium surfaces. Pre-osteoblastic cells were grown on polished titanium discs, used as controls, and on previously characterized plasma-nitrided titanium discs. Cells from both groups were submitted to the MTT cell viability test. The expressions of α5, α2, and ß1 integrin were assessed by flow cytometry and immunofluorescence, while osteocalcin expression was assessed by flow cytometry. The nitrided surface presented higher α2 and ß1 integrin expressions, as well as osteocalcin expression, when compared to the polished surface, with no alterations in cell viability. These findings seem to suggest that the plasma nitriding treatment produces a titanium surface with the potential for effective in vitro osseointegration.

Controlling burst effect with PLA/PVA coaxial electrospun scaffolds loaded with BMP-2 for bone guided regeneration.

Biocompatible scaffolds have been used to promote cellular growth and proliferation in order to develop grafts, prostheses, artificial skins and cartilage. Electrospinning is widely studied as a method capable of producing nanofibers which enables cell attachment and proliferation, generating a functional scaffold that is suitable for many types of organs or tissues. In this study, electrospinning was used to obtain core-shell and monolithic fibers from the biocompatible poly (lactic acid) and poly (vinyl alcohol) polymers. The main purpose of this work is to produce core-shell nanofiber based scaffolds that works as a sustained delivery vehicle for BMP-2 protein, allowing those fibers to be used in the recovery of alveolar bone tissue without further bone surgery. Then, polymer nanofibers were manufactured by optimizing process parameters of coaxial electrospinning with emphasis on the most relevant ones: voltage, internal and external flows in an attempt to correlate fibers properties with protein releasing abilities. All nanofibers were characterized according to its morphology, thermal behaviour, crystallinity and release profile. For the release tests, bovine albumin was added into internal fiber for future periodontal restorage application. Obtained results demonstrate that fibers were formed with diameters up to 250 nm. According to electronic microscopy images, one could observe surface of nanofibers, thickness and core-shell morphology confirmed. X-ray diffraction analysis and contact angle tests showed fibers with low crystal degree and low hydrophobicity. Nanofibers structure affected in vitro release model tests and consequently the cellular assays.

Lymphoepithelial cyst on the tongue: case report at unusual location / Cisto linfoepitelial em língua: relato de caso em localização incomum

ABSTRACT Oral lymphoepithelial cyst (OLEC) is an uncommon lesion that develops in oral lymphoid tissue. The aim of the present study was to report a clinical case of OLEC in the tongue. A 22-year-old patient presented a nodular lesion, yellowish, with a softened consistency, measuring 0.5 cm in the ventral surface of the tongue. Under the clinical hypotheses of mucocele and OLEC, excisional biopsy was performed. The histopathological examination revealed a cystic lesion covered by a parakeratinized stratified squamous epithelium, which presented in its fibrous capsule a prominent lymphoid tissue. Based on the definitive diagnosis, surgical excision of the lesion was performed.

RESUMO O cisto linfoepitelial oral (CLEO) é uma lesão incomum que se desenvolve no tecido linfoide oral. O objetivo do presente trabalho foi relatar um caso clínico de CLEO na língua. Paciente de 22 anos de idade exibia uma lesão nodular, de coloração amarelada e consistência amolecida, medindo 0,5 cm na região ventral de língua. Sob as hipóteses clínicas de mucocele e CLEO, foi realizada biópsia excisional. O exame histopatológico revelou lesão cística revestida por epitélio escamoso estratificado paraceratinizado, que apresentava em sua cápsula fibrosa tecido linfoide proeminente. Com base no diagnóstico definitivo, foi realizada a excisão cirúrgica da lesão.