Abstract 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.

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.

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 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.

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.