TWIST1 regulates proliferation, migration, and invasion and is a prognostic marker for oral tongue squamous cell carcinoma.

BACKGROUND: Epithelial-mesenchymal transition is one of the main mechanisms for tumor progression and metastasis. Transcription factors such as TWIST1 are key regulators of the epithelial-mesenchymal transition and are regarded as potential therapeutic targets for the treatment of cancer. The purpose of this study was to examine TWIST1 as a possible epithelial-mesenchymal transition-related prognostic biomarker in oral epithelial dysplasia and oral tongue squamous cell carcinomas, as well as the biological behavior of TWIST1-silencing in oral tongue squamous cell carcinomas cell lines. METHODS: Immunohistochemical analysis of TWIST1, E-cadherin, and N-cadherin was carried out in 47 samples representing oral epithelial dysplasia and 41 oral tongue squamous cell carcinomas. The suppression of TWIST1 expression was performed using shRNA-expression vectors in HSC-3 and SCC-9 cells to investigate in vitro the impact of TWIST1 on proliferation, apoptosis, viability, migration, and invasion of SCC-9 and HSC-3 cells. RESULTS: The expression of nuclear TWIST1 was significantly higher in oral tongue squamous cell carcinomas than in oral epithelial dysplasis (p < 0.0001), whereas TWIST1 in the cytoplasm was more expressed in oral epithelial dysplasis (p = 0.012). The high cytoplasmic expression of TWIST1 was significantly associated with shortened overall survival (p < 0.05), and increased nuclear TWIST1 expression was significantly related to high risk of recurrence (p = 0.03). Knockdown of TWIST1 in oral tongue squamous cell carcinomas cells induced the expression of E-cadherin and inhibited N-cadherin, which were followed by decreased proliferation, migration, and invasion. CONCLUSIONS: Our research suggests that TWIST1 is linked to the development of oral tongue carcinogenesis and may be used as a prognostic indicator and therapeutic target for oral tongue squamous cell carcinomas patients.

Oral benign fibrous histiocytoma in a pediatric patient: case report

Benign fibrous histiocytoma (BFH) is a common mesenchymal lesion on the skin where it is better known as dermatofibroma. It mainly affects areas of the integument exposed to the sun. It can occur in the mucous membranes, being quite unusual in the oral cavity. This article presents a rare case of benign oral fibrous histiocytoma in childhood. An eleven-year-old male patient sought the stomatology clinic of the dentistry course at a reference university in northeastern Brazil, complaining of an asymptomatic increase in volume on the cheek, with an evolution of approximately two years. On intraoral examination, a lesion in the cheek mucosa was observed, measuring approximately 4 cm. The lesion had a nodular, circumscribed, reddish appearance, showing ulcerated areas covered by a yellowish pseudomembrane on its surface. The clinical diagnostic hypothesis was pleomorphic adenoma. Excisional biopsy was performed and, after morphological and immunohistochemical evaluation, the diagnosis of BFH was reached. Although it is a lesion with an excellent prognosis, BFH must be carefully analyzed for the differential diagnosis with malignant neoplasms that may have a mild appearance, such as fibrosarcoma or dermatofibrosarcoma. In addition, other benign lesions such as desmoplastic fibroblastoma, myofibroma, myopericytoma and nodular fasciitis may, in some histological sections, mimic the microscopic appearance of benign fibrous histiocytoma. In this reported case, immunohistochemical evaluation was essential to conclude the diagnosis of BFH(AU)

Hydrochlorothiazide use is associated with the risk of cutaneous and lip squamous cell carcinoma: A systematic review and meta-analysis.

PURPOSE: The aim of this study is to investigate the association between hydrochlorothiazide (HCTZ) use and the risk of cutaneous and lip squamous cell carcinoma development. METHODOLOGY: We performed a systematic review and meta-analysis of case-control studies. We searched the Cochrane Library, PubMed, Scopus, Web of Science and LILACS. This study was registered in PROSPERO under protocol CRD42019129710. The meta-analysis was performed using the software Stata (version 12.0). RESULTS: A total of 2181 published studies referring to the theme were identified, from which six were included in this systematic review. Men were more frequently affected by cutaneous and lip squamous cell carcinoma than women, with a 1.42:1 ratio. The mean age for cutaneous and lip squamous cell carcinoma development was 73.7 years. This meta-analysis demonstrated a chance of developing cutaneous and lip squamous cell carcinoma in any region of the body in hydrochlorothiazide users of 1.76-fold higher than in non-users. In addition, a risk factor of 1.80 higher (CI 95% = 1.71-1.89) of cutaneous squamous cell carcinoma in the head and neck region was observed in HCTZ users. Moreover, in the analysis of the dose used, the chance of developing squamous cell carcinoma was 3.37-fold lower when the concentration of HCTZ used was less than 50,000 mg. CONCLUSIONS: Our results confirm the association between the use of hydrochlorothiazide and the cutaneous and lip squamous cell carcinoma development.

Role of plasminogen activator inhibitor-1 in oral tongue squamous cell carcinoma: An immunohistochemical and in vitro analysis.

OBJECTIVE: To evaluate the influence of plasminogen activator inhibitor-1 (PAI-1) on the biological behavior and prognosis of oral tongue squamous cell carcinoma (OTSCC). METHODS: Immunoexpression of PAI-1 was analyzed in 60 OTSCC specimens and classified as low-expression (≤50% of positive cells) or high-expression (>50%). In vitro effects of recombinant human PAI-1 (rhPAI-1) were assessed through functional assays on the OTSCC-derived cell line SCC-25. Three cell groups were evaluated: G0 (control), G10 (10 nM rhPAI-1), and G20 (20 nM rhPAI-1). RESULTS: High membrane expression of PAI-1 was associated with tumor budding (p = 0.046) and high-risk cases (p = 0.043). Cytoplasmic and membrane expression of PAI-1 was not associated with patient survival. Cell viability (p = 0.020) and progression to the S-phase of the cell cycle (p = 0.024) were higher in G10 and G20 at 24 h. The percentages of apoptotic/necrotic cells were not affected by rhPAI-1. The presence of rhPAI-1 increased cell migration (p = 0.039) and invasion (p = 0.039) after 24 and 72 h, respectively. CONCLUSION: Our findings indicate the involvement of PAI-1 in the biological behavior of OTSCC, although its expression may not predict patient survival. The in vitro results suggest that PAI-1 stimulates cell proliferation, migration and invasion and may contribute to the aggressive phenotype of OTSCC.

Methylmercury-induced cytotoxicity and oxidative biochemistry impairment in dental pulp stem cells: the first toxicological findings.

BACKGROUND: Methylmercury (MeHg) is a potent toxicant able to harm human health, and its main route of contamination is associated with the consumption of contaminated fish and other seafood. Moreover, dental amalgams are also associated with mercury release on human saliva and may contribute to the accumulation of systemic mercury. In this way, the oral cavity seems to be the primary location of exposure during MeHg contaminated food ingestion and dental procedures but there is a lack of literature about its effects on dental tissues and the impact of this toxicity on human health. In this way, this study aimed to analyze the effects of different doses of MeHg on human dental pulp stem cells after short-term exposure. METHODS: Dental pulp stem cells from human exfoliated deciduous teeth (SHED) were treated with 0.1, 2.5 and 5 µM of MeHg during 24 h. The MeHg effects were assessed by evaluating cell viability with Trypan blue exclusion assay. The metabolic viability was indirectly assessed by MTT reduction assay. In order to evaluate an indicative of antioxidant defense impairment, cells exposed to 0.1 and 5 µM MeHg were tested by measuring glutathione (GSH) level. RESULTS: It was observed that cell viability decreased significantly after exposure to 2.5 and 5 µM of MeHg, but the metabolic viability only decreased significantly at 5 µM MeHg exposure, accompanied by a significant decrease in GSH levels. These results suggest that an acute exposure of MeHg in concentrations higher than 2.5 µM has cytotoxic effects and reduction of antioxidant capacity on dental pulp stem cells.

Effect of low-level laser therapy on seminiferous epithelium: a systematic review of in vivo studies.

Laser therapy has proved effective in the treatment of different tissue injuries but little is known about its effect on the testis. The aim of this review was to synthesize research on the in vivo effect of low-level laser therapy on the seminiferous epithelium. A search was performed in the PubMed/Medline, Scopus, Web of Science, and LILACS databases. The initial search retrieved 354 references, and five articles that met the eligibility criteria were selected. In general, the studies showed that laser therapy exerted a positive effect on the germ cell population; however, there was considerable variation in the laser parameters, as well as in the experimental models and methods of tissue analysis used. In conclusion, further studies determining the biostimulation parameters of laser therapy in the testis are necessary in order to provide a basis for the possible application of this technique to the restoration of the human seminiferous epithelium and consequent treatment of some male reproductive disorders.

Primary Intraosseous Squamous Cell Carcinoma Involving the Jaw Bones: A Systematic Review and Update.

Primary intraosseous oral squamous cell carcinoma (PIOSCC) is a rare malignant neoplasm that affects the jaws. Despite its aggressive biological behavior, there are no studies that evaluated the clinicopathological features of this tumor and parameters associated with its prognosis. The objective of the present study was to conduct a systematic review of the available data on oral and maxillofacial PIOSCC in order to determine its clinicopathological characteristics and biological behavior. We conducted a systematic review in May 2020 in multiple databases using a specific search strategy. Cases diagnosed as PIOSCC in the oral cavity and maxillofacial complex that had sufficient histopathological data, absence of ulceration in the oral mucosa, a negative result for a distant primary tumor, and radiographic evidence of an osteolytic lesion that was entirely or mostly surrounded by the jaw bones were included. A total of 109 published articles were included in our systematic review, corresponding to 257 cases. PIOSCC showed a male predilection (69.3%) and a preference for the mandible (7:1), with the posterior region being the most commonly affected site. The mean age at diagnosis was 57.3 years. Cortical expansion, pain, and lip/facial paresthesia were the most common clinical features. Regarding histopathological features, most PIOSCC were well-differentiated and the solid subtype was the most common. Statistical analysis showed that PIOSCC located in the mandible (p = 0.03) and recurrence (p < 0.01) were significantly associated with a higher mortality rate. PIOSCC has a poor prognosis, with high rates of mortality.

DNA base excision repair and nucleotide excision repair proteins in malignant salivary gland tumors.

OBJECTIVE: To analyze the immunohistochemical expression of the base excision repair (BER) proteins apurinic/apyrimidinic endonuclease 1 (APE1) and X-ray repair cross-complementing protein 1 (XRCC1) and nucleotide excision repair (NER) protein xeroderma pigmentosum group F (XPF) in malignant salivary gland tumors (MSGTs). DESIGN: Sixty-two cases of MSGTs were selected, including 14 acinic cell carcinomas (AcCC), 15 polymorphous adenocarcinomas (PAC), 16 adenoid cystic carcinomas (ACC), and 17 mucoepidermoid carcinomas (MEC). The specimens were submitted to quantitative immunohistochemical analysis. RESULTS: All MSGTs exhibited nuclear or nucleo-cytoplasmic immunostaining of APE1, XRCC1 and XPF, with a high percentage of positive cells (median = 78.31, 70.48 and 75.46, respectively). XRCC1 expression was higher in PAC compared to MEC (p = 0.032). Nuclear APE1 immunostaining was significantly higher than nucleo-cytoplasmic expression in the selected MSGTs (p < 0.0001). APE1 expression was significantly associated with T1-T2 tumors in ACC (p = 0.006). Increased expression of XPF was associated with age older than 60 years in MEC (p = 0.015) and with ACC involving the minor salivary gland (p = 0.012), while a lower expression was found in AcCC and ACC patients treated by surgery combined with adjuvant therapy (p = 0.036 and p = 0.020, respectively). Low expression of XRCC1 in the nucleus (p = 0.028) and concomitant expression of this protein in the nucleus/cytoplasm were associated with a lower overall 5-year survival rate (p = 0.017). CONCLUSIONS: This study showed that BER and NER proteins evaluated are highly expressed in the MSGTs studied, indicating mechanisms of genotoxic control in these tumors. In addition, the dysregulation of XRCC1 expression was a prognostic predictor in MSGTs analyzed.

YouTube™ and oral lichen planus: an appraisal of the educational quality of information.

The objective of this study was to analyze the quality of videos on oral lichen planus (OLP) available in YouTube™. A cross-sectional analytical study was conducted by searching the video sharing platform YouTube™. Videos aimed at clarifying the etiological and clinical characteristics, diagnostic criteria, treatment, and prognosis of OLP were included. A total of 481 videos were retrieved and 37 were included in the study according to the selection criteria established. Most of the videos evaluated (86.5%; n = 32) were produced by independent users. The average reliability was 1.8 and quality assessment classified only three videos (8.1%) as having good/excellent quality. A significant correlation was observed between the length of the video analyzed and its quality and reliability (p < 0.05), as well as between the reliability and usefulness of the video (p = 0.03). YouTube™ has become a leading source of information for the general population. However, a significant number of these videos have a low quality. Students, professionals, and healthcare providers must be more actively involved in providing clear, accurate, and reliable evidence-based information in an accessible language in order to enable significant improvement in patient care delivery.

Laser therapy increases the proliferation of preosteoblastic MC3T3-E1 cells cultured on poly(lactic acid) films.

This study aimed to verify the efficacy of low-level laser irradiation (LLLI) on the proliferation of MC3T3-E1 preosteoblasts cultured on poly(lactic acid) (PLA) films. The produced films were characterized by contact angle tests, scanning electron microscopy (SEM), atomic force microscopy, differential scanning calorimetry, and X-ray diffraction. The MC3T3-E1 cells were cultured as three different groups: Control-cultured on polystyrene plastic surfaces; PLA-cultured on PLA films; and PLA + Laser-cultured on PLA films and submitted to laser irradiation (660 nm; 30 mW; 4 J/cm2 ). Cell proliferation was analyzed by Trypan blue and Alamar blue assays at 24, 48, and 72 h after irradiation. Cell viability was assessed by Live/Dead assay, apoptosis-related events were evaluated by Annexin V/propidium iodide (PI) expression, and cell cycle events were analyzed by flow cytometry. Cell morphology on the surface of films was assessed by SEM. Cell counting and biochemical assay results indicate that the PLA + Laser group exhibited higher proliferation (p < 0.01) when compared with the Control and PLA groups. The Live/Dead and Annexin/PI assays indicate increased cell viability in the PLA + Laser group that also presented a higher percentage of cells in the proliferative cell cycle phases (S and G2/M). These findings were also confirmed by the higher cell density observed in the irradiated group through SEM images. The evidence from this study supports the idea that LLLI increases the proliferation of MC3T3-E1 cells on PLA surfaces, suggesting that it can be potentially applied in bone tissue engineering.

The use of enamel matrix derivative in the treatment of class II furcation defects: systematic review and meta-analysis.

OBJECTIVE: To evaluate the effect of enamel matrix derivative (EMD) in the regeneration of class II furcation defects, used alone or in conjunction with biomaterials. METHODS: Electronic database searches and hand searches were carried out and double-blind randomized controlled trials evaluating the use of EMD in class II furcation therapy were included, and a meta-analysis comparing the effect of open flap debridement (OFD) + ßTCP/HA with and without EMD was carried out. RESULTS: The initial search resulted in a total of 298 articles, after removing the duplicates and exclusions after analysing the titles, abstracts and full text, five studies were included for the qualitative synthesis and two for the quantitative analysis. The meta-analysis showed no statistical difference when comparing OFD + ßTCP/ HA with or without EMD in the treatment of furcation defects in any of the evaluated parameters. According to GRADE, the certainty of the evidence for the variables evaluated was moderate. CONCLUSION: The therapeutic modalities studied improved the periodontal clinical parameters of class II furcations, but the use of EMD in the treatment of these defects did not contribute to a clinical improvement that justified its use associated with the therapies/biomaterials. It is important to emphasize the need for more studies with larger samples to increase the certainty of the evidence reported in this review.

Safety and Effectiveness of Copaiba Oleoresin (C. reticulata Ducke) on Inflammation and Tissue Repair of Oral Wounds in Rats.

In traditional communities of the Brazilian Amazon, the copaiba oleoresin (C. reticulata Ducke) is widely known for its therapeutic activity, especially its wound healing and anti-inflammatory actions. Our study aimed to evaluate these effects in oral lesions and the safety of the dosage proposed. A punch biopsy wound was induced on the ventral surface of the tongue of forty-five male Wistar rats under anesthesia. Animals were randomly allocated to one of three groups based on the treatment: control, corticoid and copaiba. A daily dose of each treatment and vehicle was administrated by oral gavage for three consecutive days. Sample collections took place on the third, seventh and 15th days post-wounding for clinical and histopathological analyses. Blood was collected on the third and seventh days for kidneys and liver function tests. Semi-quantitative analyses were performed based on scores of inflammation and reepithelization. Tissue collagen deposition was detected by PicroSirius red staining. Copaiba-treated wounds revealed a smaller wound area, decreased of acute inflammatory reaction and enhanced reepithelization. The levels of kidney and liver function tests did not reveal presence of damage post-treatments. Our findings suggest that copaiba oleoresin is a safe and effective alternative therapy for inflammation and tissue repair of oral wounds in this animal model.

Avaliação do conhecimento de cirurgiões-dentistas diante do atendimento a cardiopatas graves na atenção primária / Assessment of the knowledge of dentists in the face of care for severe cardiac patients in primary care

O objetivo desse estudo foi avaliar o conhecimento dos cirurgiões-dentistas que trabalham na atenção primária à saúde em um município do nordeste Brasileiro, frente ao atendimento de pacientes portadores de doenças cardiovasculares. Para tanto, de uma população de 36 dentistas, uma amostragem por conveniência de 25 profissionais (69,4%) foi analisada, sob a forma de um questionário autoaplicável. A maioria dos profissionais é formada há mais de 10 anos, sendo que todos se utilizam de artifícios para controle de ansiedade, principalmente a franca conversa (96%). Quanto à prevenção da endocardite infecciosa, foi demonstrada dúvida quanto aos procedimentos onde profilaxia antibiótica é necessária em cardiopatas graves. Outras questões que os profissionais demonstraram despreparo teórico foram quanto ao diagnóstico de hipertensão arterial sistêmica, a qual apenas 64% dos odontólogos assinalaram corretamente; tempo de estabilidade de angina de peito (36,9%) e quantidade de anestésicos com vasopressor à base de epinefrina seguro ao paciente em particular (54,2%). De acordo com a análise das respostas e sua comparação junto ao levante bibliográfico, tem-se claramente em vista a necessidade dos profissionais se atualizarem, sob alguma forma de educação permanente(AU)

The correct evaluation of patients with cardiovascular disease is based on a careful anamnesis and on the previous knowledge of the main coronary diseases and its sequels. This study aims to evaluate the knowledge of dentists working in primary health care in the city of Campina Grande about patients with cardiovascular disease. For this purpose, from a population of 36 dentists, a convenient sample of 25 professionals (69.4%) was analyzed in the form of a self-administered questionnaire. Most professionals is formed more than 10 years, all of which make use of anxiety handling, especially an honest conversation (96%). As for the prevention of infective endocarditis has been demonstrated doubt as to the procedures where antibiotic prophylaxis is needed in severe heart disease. Other issues that professionals demonstrated theoretical unpreparedness were the diagnosis of hypertension, which only 64% of dentists pointed out correctly; time of stable angina pectoris (36.9%) and the safe amount of anesthetic with vasoconstrictor epinephrine to the cardiac patient (54.2%). Conclusion: According to the analysis of the responses and its comparison with the literature, highlighting the need to implement a continuing education(AU)

Atividade antimicrobiana de substâncias fitoterápicas utilizadas no tratamento de afecções bucais: estudo in vitro / Antimicrobian activity of phytoterapicsubstances used in the treatment of buccal afecctions: In vitro study / Actividad antimicrobiana de sustancias fitoterapéuticas utilizadas en el tratamiento de trastornos orales: estudio in vitro

Introdução:A utilização de fitoterápicos para os tratamentos de prevenção e de suporte de patologias situadas nos diversos órgãos e tecidos, caracteriza-se como uma prática amplamente disseminada no Brasil.Objetivo:Avaliar a ação antimicrobiana de 09 substâncias fitoterápicas utilizadas costumeiramentepara o tratamento de suporte em algumas afecções bucais no nordeste brasileiro. Materiais:O experimento in vitrofoi realizado no Laboratório de Microbiologia do Centro de Biociências da Universidade Federal do Rio Grande do Norte, e o preparo foi realizado por decocção em por um período de 10 minutos e para cada espécie de bactérias, foram utilizadas duas Placas dePetri com meio de cultura Agar Muller Hinton.Métodos:Para a realização da decocção, foi utilizadauma quantidade de 10 gramas eesperou-se os preparos atingir a temperatura ambiente (37º),aatividade antimicrobiana foi avaliada frente à duas cepas de bactérias,através de uma técnica de observação em laboratório, para cada espécie de bactéria.Foram utilizadas duas Placas de Petri com meio de cultura Agar Muller Hinton, onde a inoculação foi realizada por meio de Swabs, e sobre os quais foram realizadoscinco poços de aproximadamente 6 mm de diâmetro. Resultados:Os extratos da semente de manuscada, óleo de coco, casca de cajueiro, semente de sucupira, raiz de urtiga branca e gengibre, foram ineficazes contra o Streptococcus mutans,e Streptococcus mitis,por outro lado o extrato de româ exibiu eficácia para o Streptococcus mutanse a pedra hume exibiu eficácia parao Streptococcus mitis.Conclusões:Os extratos de casca de cajueiro, casca de romã, gengibre e de pedra hume foram eficazes antibacterianos sobre Streptococcus mutansquando comparado com o Periogard®, considerado padrão ouro nos estudos sobre os agentes antibacterianos na odontologia (AU).

Introduction:The use of herbal medicines for the prevention and support treatments of pathologies located in the various organs and tissues is characterized as a widespread practice in Brazil.Objective:To analyze, from the elaboration of antibiogramsof the species Streptococcus mutans and Streptococcus mitis, the antimicrobial activity of phytotherapeutic species in oral disorders.Materials:The in vitro experiment was carried out at the Microbiology Laboratory of the Biosciences Center of the Federal University of Rio Grande do Norte, and the preparation was carried out by decoction in a period of 10 minutes and for each species of bacteria, two plates were used Petri dish with Agar Muller Hinton culture medium.Methods:For the decoction, a quantity of 10 grams was used and the preparations were expected to reach room temperature (37º), the antimicrobial activity was evaluated against two strains of bacteria, using a laboratory observation technique, for each species of bacteria, two Petri dishes with Agar Muller Hinton culture medium were used, where the inoculation was performed by means of Swabs, and on which five wells of approximately 6 mm in diameter were made.Results:The extracts of the mamuscada seed, coconut oil, cashew bark, sucupira seed, white nettle root and ginger, were ineffective against Streptococcus mutans, and Streptococcus mitis, on the other hand, pomegranate extract showed efficacy for Streptococcus mutans and the hume stone showed efficacy for Streptococcus mitis. Conclusions:Cashew bark, pomegranate, ginger and hume stone extracts were effective antibacterials against Streptococcus mutans when compared to Periogard®, considered the gold standard in studies on antibacterial agents in dentistry (AU).

Introducción: El uso de hierbas medicinales para la prevención y el tratamiento de apoyo de patologías localizadas en los diversos órganos y tejidos se caracteriza como una práctica generalizada en Brasil. Objetivo:analizar, a partir de la elaboración de antibiogramas de las especies Streptococcus mutans y Streptococcus mitis, la actividad antimicrobiana de las especies fitoterapéuticas en los trastornos orales.Materiales:Elexperimento in vitro se realizó en el Laboratorio de Microbiología del Centro de Biociencias de la Universidad Federal de Rio Grande do Norte, y la preparación se realizó por decocción en un período de 10 minutos y para cada especie de bacteria, se utilizaron dos placas. Placa de Petri con medio de cultivo Agar Muller Hinton. Resultados:los extractos de semilla de mamuscada, aceite de coco, corteza de anacardo, semilla de sucupira, raíz de ortiga blanca y jengibre, no fueron efectivos contra Streptococcus mutans y Streptococcus mitis, por otrolado, el extracto de granada mostró eficacia para Streptococcus mutans y el cálculo de húmero mostraron eficacia para Streptococcus mitis.Métodos:Para la decocción, se utilizó una cantidad de 10 gramos y se esperaba que las preparaciones alcanzaran la temperatura ambiente (37º), se evaluó la actividad antimicrobiana contra dos cepas de bacterias, utilizando una técnica de observación de laboratorio. Para cada especie de bacteria, se utilizaron dos placas de Petri con medio de cultivo Agar Muller Hinton, donde la inoculación se realizó por medio de hisopos, y en la cual se hicieron cinco pozos de aproximadamente 6 mm de diámetro.Conclusiones:los extractos de corteza de anacardo, granada, jengibre y cálculos de húmero fueron antibacterianos efectivos contra Streptococcus mutans en comparación con Periogard®, considerado el estándar de oro en estudios sobre agentes antibacterianos en odontología (AU).

Piceatannol Increases Antioxidant Defense and Reduces Cell Death in Human Periodontal Ligament Fibroblast under Oxidative Stress.

Piceatannol is a resveratrol metabolite that is considered a potent antioxidant and cytoprotector because of its high capacity to chelate/sequester reactive oxygen species. In pathogenesis of periodontal diseases, the imbalance of reactive oxygen species is closely related to the disorder in the cells and may cause changes in cellular metabolism and mitochondrial activity, which is implicated in oxidative stress status or even in cell death. In this way, this study aimed to evaluate piceatannol as cytoprotector in culture of human periodontal ligament fibroblasts through in vitro analyses of cell viability and oxidative stress parameters after oxidative stress induced as an injury simulator. Fibroblasts were seeded and divided into the following study groups: control, vehicle, control piceatannol, H2O2 exposure, and H2O2 exposure combined with the maintenance in piceatannol ranging from 0.1 to 20 µM. The parameters analyzed following exposure were cell viability by trypan blue exclusion test, general metabolism status by the 3-[4,5-dimethylthiazole-2-yl]-2,5-diphenyltetrazolium bromide (MTT) method, mitochondrial activity through the ATP production, total antioxidant capacity, and reduced gluthatione. Piceatannol was shown to be cytoprotective due the maintenance of cell viability between 1 and 10 µM even in the presence of H2O2. In a concentration of 0.1 µM piceatannol decreased significantly cell viability but increased cellular metabolism and antioxidant capacity of the fibroblasts. On the other hand, the fibroblasts treated with piceatannol at 1 µM presented low metabolism and antioxidant capacity. However, piceatannol did not protect cells from mitochondrial damage as measured by ATP production. In summary, piceatannol is a potent antioxidant in low concentrations with cytoprotective capacity, but it does not prevent all damage caused by hydrogen peroxide.

Immunohistochemical analysis of MMP-13 and EMMPRIN in epithelial odontogenic lesions.

PURPOSE: To investigate the contribution of MMP-13 in tumor aggressiveness, by acting on the reorganization of the extracellular matrix, regulating the biological activity of cytokines in odontogenic epithelial lesions, as well as to evaluate the role of EMMPRIN as an inducer of MMP-13. METHODS: Twenty solid ameloblastomas (SAs), 10 unicystic ameloblastomas (UAs), 20 odontogenic keratocysts (OKCs), and 20 adenomatoid odontogenic tumors (OATs) were selected. The expression of MMP-13 and EMMPRIN was evaluated in epithelial/connective tissue by determining the score of immunoreactive cells. RESULTS: Higher concentration of MMP-13 was observed in epithelium of SAs and OKCs (p = 0.316), while in connective, MMP-13 was more expressed in OKCs and UAs (p = 0.213). OKCs exhibited the highest immunoreactivity score for EMMPRIN in the epithelium (p = 0.091). In connective tissue, a larger number of immunoreactive cells were observed in OKCs and UACs (p = 0.357). There was a moderate correlation (r = 0.343/p = 0.004) between MMP-13/EMMPRIN in epithelium and strong correlation (r = 0.474/p < 0.001) in connective tissue. CONCLUSION: We suggest that the OKCs, SAs and UAs presented greater immunoexpression for MMP-13 and EMMPRIN, since they were lesions of more aggressive behavior, with smaller expressions in the AOTs that are admittedly indolent. However, we did not find a statistically significant difference between the expression of MMP-13 and EMMPRIN in lesions studied. The positive correlation found between MMP-13 and EMMPRIN in the epithelial and connective tissue of odontogenic lesions analyzed, seems to be related to the role of EMMPRIN as an inducer of MMP-13 expression.

Aspectos clínico-patológicos de queilite granulomatosa: relato de caso / Clinical and pathological aspects of Granulomatosis Queilite: Case Report

Introdução:A queilite granulomatosa (QG) é uma lesão oral rara, apresentando clinicamente inchaço de aspecto granulomatoso no lábio.Objetivo:O presente estudo, tem como objetivo apresentar um relato de caso de QG, tendo em vista, a dificuldade do diagnóstico e tratamento de condições inflamatórias com etiologias desconhecidas que acometem a cavidade oral.Relato de caso:Paciente do sexo feminino, apresentou aumento de volume no lábio superior exibindo sintomatologia dolorosa, porém, sem relatar associações com alterações sistêmicas. Durante o exame clínico notou-se que o lábio superior apresentava fissuras profundas, observando tambémedema que se estendia da comissura labial, atravessando a linha média. Levantou-se então, a hipótese diagnóstica de QG. Foi realizada uma biópsia incisional para confirmação do diagnóstico. A análise histopatológica evidenciou, presença de granulomas não caseosos e infiltrado inflamatório linfoplasmocitário perivascular. De acordo com os dados clínicos e análise histopatológica foi dado o diagnóstico inicial de QG. Após o diagnóstico inicial de QG, a paciente foi encaminhada para uma avaliação médica, a fim de avaliar possíveis alterações intestinais que pudessem caracterizar a síndrome de Melkersson-Rosenthal ou Cronh, como também possível reação de hipersensibilidade tardia. Conclusões:O cirurgião-dentista deve estar preparado para diagnosticar aumentos de volume significativos nos lábios, a fim de manejar corretamente o tratamento do paciente, estabelecendo desta forma, prognósticos favoráveis para essas condições (AU).

Introduction:Granulomatous cheilitis (HQ) is a rare oral lesion, presenting clinically granulomatous swelling on the lip. Objective: This study aims to present a case report of HG, considering the difficulty of diagnosis and treatment of inflammatory conditions with unknown etiologies that affect the oral cavity.Objective:This study aims to present a case report of HG, considering the difficulty of diagnosis and treatment of inflammatory conditions with unknown etiologies that affect the oral cavity.Case report:A female patient presented increased volume in the upper lip showing painful symptoms, but without reporting associations with systemic alterations. During the clinical examination it was observed that the upper lip presented deep fissures, also observing edema that extended from the labial commissure, crossing the middle line. The diagnostic hypothesis of GQ was then raised. An incisional biopsy was performed to confirm the diagnosis. Histopathological analysis revealed the presence of non-caseous granulomas and perivascular lymphoplasmacytic inflammatory infiltrate. According to the clinical data and histopathological analysis the initial diagnosis of GH was given. After initial diagnosis of HG, the patient was referred for medical evaluation to evaluate possible intestinal changes that could characterize Melkersson-Rosenthal syndrome or Cronh, as well as possible late hypersensitivity reactions.Conclusions:The dentist should be prepared to diagnose significant volume increases in the lips in order to correctly manage the patient's treatment, thus establishing favorable prognoses for these conditions (AU).

Perfil clínico-epidemiológico do carcinoma epidermoide bucal em pacientes adultos jovens dos 20 aos 45 anos: revisão sistemática / Clinical and epidemiological profile of oral squamous cell carcinoma in young adult patients aged 20 to 45 years: systematic review

Objetivo: identificar e descrever o perfil clínico e epidemiológico do carcinoma epidermoide bucal (CEB) em pacientes adultos jovens. Revisão da literatura: realizou-se uma revisão sistemática, utilizando-se como fontes de buscas as bases de dados eletrônicas Lilacs, SciELO, PubMed e Portal de Periódicos Capes, por meio dos descritores: câncer bucal, carcinoma de células escamosas oral, epidemiologia e paciente jovem, nos idiomas português, inglês e espanhol, no período de janeiro de 2003 a janeiro de 2016. Foram identificados 348 artigos, sendo 171 no Portal de Periódicos Capes, 126 no PubMed, 26 no Lilacs e 2 no SciELO. Após análise dos estudos localizados, oito artigos foram selecionados para a presente revisão sistemática. Considerações finais: são necessários mais estudos para a identificação das características clínicas e epidemiológicas do tumor na população em questão, bem como a padronização da faixa etária referente ao termo adulto jovem, visto que esses esclarecimentos podem refletir no seu controle e possibilitar o desenvolvimento de um programa de prevenção primária para o CEB em pacientes jovens. (AU)

Objective: to identify and describe the clinical and epidemiological profile of oral squamous cell carcinoma in young adult patients. Literature Review: a systematic review was performed using the Lilacs, SciELO, PubMed, and Periódicos Capes electronic databases as search sources, through the following descriptors: oral cancer, oral squamous cell carcinoma, epidemiology, and young patient, in English, Spanish, and Portuguese, from January 2003 to January 2016. A total 348 articles were identified, from which 171 were found in Periódicos Capes, 126 in PubMed, 26 in Lilacs, and 2 in SciELO. After analyzing the studies found, eight articles were selected for the present systematic review. Final considerations: further studies are required to identify the clinical and epidemiological characteristics of the tumor in this population and to standardize the age regarding the term young adult, considering these explanations may reflect in its control and allow developing of a primary prevention program for oral squamous cell carcinoma in young patients. (AU)

Conhecimento dos cirurgiões-dentistas em atendimento de pacientes com coagulopatias hereditárias / Knowledge of dentists in the care of patients with hereditary coagulopathies

Objetivo: verificar o conhecimento dos cirurgiões-dentistas que trabalham nas Unidades Básicas de Saúde (UBS) com Equipes de Saúde Bucal (ESB) modalidade I, no município de Campina Grande, sobre o atendimento odontológico de pacientes com coagulopatias hereditárias. Sujeitos e método: por meio de questionário autoaplicável, foi feita uma entrevista com os cirurgiões-dentistas do município em questão para analisar os seus conhecimentos. Participaram da pesquisa 24 profissionais que se encaixaram nos critérios de inclusão e responderam de forma adequada o questionário com questões objetivas, sendo que os participantes foram orientados a assinalar somente uma alternativa para cada questionamento. Resultados: a maioria dos profissionais é formada há mais de 10 anos. A média de acertos das respostas foi de 50%. Em relação aos achados clínicos que determinam a possível presença de distúrbio hemorrágico, 44% afirmaram que são: púr-pura, sangramento gengival espontâneo e hemartrose. Os pacientes considerados de risco elevado para o tratamento odontológico foram: pacientes sem distúrbios hemorrágicos revelados, mas com exames complementares alterados; pacientes em tratamento com AAS; e pacientes em tratamento com anticoagulante por via oral. A maioria (68%) não considera a utilização de sugadores de saliva como risco para sangramento bucal. Os procedimentos odontológicos que os profissionais não se sentem seguros a executar, nesse tipo de paciente, foram: exodontias (88%); tratamento periodontal cirúrgico (76%); raspagem e alisamento coronoradicular (RACR) (28%); anestesia do nervo alveolar inferior ou outros (24%); tratamento endodôntico (20%); e anestesia infiltrativa (8%). Conclusão: os dados obtidos na pesquisa mostraram que o conhecimento dos cirurgiões-dentistas das UBS do município de Campina Grande não é satisfatório, havendo dúvidas sobre a maioria dos tratamentos odontológicos direcionados aos pacientes com coagulopatias hereditárias. (AU)

Objective: this study aimed to determine the knowledge of dentists working in UBS with ESB mode I in the city of Campina Grande on Patients with hereditary Coagulopathies. Through self-administered questionnaire, own and without exclusion criteria, an interview was conducted with dental surgeons of the municipality concerned to analyze their knowledge of the relevant topic. By itself and without exclusion criterion an interview was made with the dentists concerning to analyze their knowledge about hereditary coagulopathies. Subjects and method: the participants were 24 dentists which fit the inclusion criteria and responded adequately to the questionnaire which contained objective questions, and the respondents were asked to point out only one alternative of each questioning. Results: most of them were graduated over 10 years. The mean score was 50% of the questionnaire. In relation to clinical findings that determine the possible presence of bleeding disorder, 44% said they are: purple spontaneous gingival bleeding and hemarthrosis; patients considered at high risk for dental treatment were patients without bleeding disorders disclosed but with altered exams; patients being treated with ASA; and patients treated with anticoagulant orally. Most dentists (68%) do not consider the use of saliva-sucking as a risk for oral bleeding. Dental procedures that professionals do not feel safe running in those patients were: extractions (88%); surgical periodontal treatment (76%); RACR (28%); anesthesia of nerve alveolar inferior or other (24%); endodontic treatment (20%); and infiltrative anesthesia (8%). Conclusion: the data obtained from the survey showed that knowledge of dentists from Campina Grande municipality is not satisfactory and there is doubt on most dental treatments targeted to patients with inherited bleeding disorders. (AU)

Expansion and phenotypic changes of mouse bone marrow mesenchymal cells cultured with FGF-2 and facial nerve-conditioned medium / Expansión y cambios fenotípicos de células mesenquimales de médula ósea de ratón cultivadas con FGF-2 y medio condicionado por el nervio facial

Mesenchymal cells (MCs) exhibit great regenerative potential due to their intrinsic properties and ability to restore tissue function, either directly through transdifferentiation or indirectly through paracrine effects. This study aimed to evaluate morphometric and phenotypic changes in MCs grown with facial nerve-conditioned medium in the presence or absence of fibroblast growth factor 2 (FGF-2). For quantitative phenotypic analysis, the expression of GFAP, OX-42, MAP-2, β-tubulin III, NeuN, and NF-200 was analyzed by immunocytochemistry. Cells cultured with facial nerve-conditioned medium in the presence of FGF-2 expressed GFAP, OX-42, MAP-2, β-tubulin III, NeuN, and NF-200. On average, the area and perimeter of GFAP-positive cells were higher in the group cultured with facial nerve-conditioned medium compared to the group cultured with conditioned medium and FGF-2 (p=0.0001). This study demonstrated the plasticity of MCs for neuronal and glial lineages and opens up new research perspectives in cell therapy and trans.differentiation.

Las células mesenquimales (CM) exhiben un gran potencial regenerativo debido a sus propiedades intrínsecas y la capacidad de restaurar la función del tejido, ya sea directamente, a través de la transdiferenciación, o indirectamente, a través de efectos parácrinos. Este estudio tuvo como objetivo evaluar los cambios morfométricos y fenotípicos en CM cultivadas con medio condicionado por nervio facial en presencia o ausencia de factor de crecimiento de fibroblastos 2 (FGF-2). Para el análisis fenotípico cuantitativo, se analizó la expresión de GFAP, OX-42, MAP-2, β-tubulina III, NeuN y NF-200 mediante inmunocitoquímica. Las células cultivadas con medio condicionado por el nervio facial en presencia de FGF-2 expresaban GFAP, OX-42, MAP-2, β-tubulina III, NeuN y NF-200. En promedio, el área y el perímetro de las células positivas para GFAP fueron mayores en el grupo cultivado con medio condicionado por el nervio facial en comparación con el grupo cultivado con medio acondicionado y FGF-2 (p = 0,0001). Este estudio demostró la plasticidad de CM para linajes neuronales y gliales y abre nuevas perspectivas de investigación en terapia celular y transdiferenciación.